var str1 = "Hello "; var str2 = "world!"; var res = str1.concat(str2); // does not change the existing strings, but // returns a new string containing the text // of the joined strings. @FelixKling, since you're the accepted answer, could you just update your own answer to point out the other correct usages? How do I remove a property from a JavaScript object? Connect and share knowledge within a single location that is structured and easy to search. Does integrating PDOS give total charge of a system? Here we're using the window.prompt() function, which asks the user to answer a question via a popup dialog box then stores the text they enter inside a given variable in this case name.We then use the window.alert() function to display another popup containing a string which inserts the name into a generic greeting message. Any particular reason here for using back-ticks? var obj = null; or. Is there a higher analog of "category with all same side inverses is a groupoid"? I've tried wrap your code inside a function but id returned me name which was used as argument. Instead of converting the variable name into a string, I convert a string into a variable. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? But I think there is no structure equivalent to Expression Trees in .NET. No, You need to use backticks. Is this possible in SQL , in PL/SQL we have execute immediate, but not sure in SQL.The reason the above won't work is that the lambda expressions get types Func<string, DateTime> and Func<string, string> etc. @titusfx you can swap out const for let or var and it works just the same. The program, therefore, prints the first message in the console-This is a string data type. Got them the wrong way round on my example. How do I include a JavaScript file in another JavaScript file? How to use querySelectorAll with a variable? But for the operation variable, the value is assigned to a placeholder that comes next in the sequence. The following sample code depicts a simple string used as a template literal. You should put your variables in this string like this format "%s1, %s2, %s12". Disconnect vertical tab connector from PCB. Try sprintf in JS 1. Does a 120cc engine burn 120cc of fuel a minute? The sprintf.js library is feature-rich and dominates the space as it offers much more than the Template Literals when it comes to embedding the variable values. I had an issue while using "arguments". The general rules for constructing names for variables (unique identifiers) are: Names can contain letters, digits, underscores, and dollar signs. Can virent/viret mean "green" in an adjectival sense? let carName1 = "Volvo XC60"; // Double quotes. Here is the desired solution we need: a = "Delft" b = "Stack" result = "DelftStack". What does "use strict" do in JavaScript, and what is the reasoning behind it? However, my case was specific to referring to the same string literal hundreds of times per frame (say in a visualization with many dynamically labeled points). Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? 3. if you want to concatenate the string representation of the values of two variables, use the + sign : var var1 = 1; var var2 = "bob"; var var3 = var2 + var1;//=bob1. Received a 'behavior reminder' from manager. sprintf.js is an open-source library for JavaScript. Penrose diagram of hypothetical astrophysical white hole, Typesetting Malayalam in xelatex & lualatex gives error, Connecting three parallel LED strips to the same power supply. Ready to optimize your JavaScript with Rust? Not the answer you're looking for? Sed based on 2 words, then replace whole line with variable. Don't worry about the "unnecessary" string objects. This is the best answer as I see here ;) :). 1980s short story - disease of self absorption, Counterexamples to differentiation under integral sign, revisited. I can't think of another way to put it than "if you can write. the only problem is when you pass in something like this: nameof(() => options.subOptions.displaySize) which returns "subOptions" Instead, I used this regex: exp.toString().match(/(?=[^. I'm guessing it's not this: In Java, Strings are immutable and doing something like the above would unnecessarily create and throw away Strings. Just including a string in a set of backticks by itself makes it a string value. JSON. But if you're using a transpiler for the object destructuring in the first place, it probably supports const already. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? It can be considered as a new string holding the values of your variables. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. debugVar({somefancyvariable}); The %s will auto type-cast the number to a string data type. It also allows passing object directly in the second argument and resolves the variables automatically. The value stored in a variable can be changed during program execution. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I pass command line arguments to a Node.js program? JavaScript strings are for storing and manipulating text. The plus (concatenation) operator makes a new string from pieces of an old one. var obj = undefined; For strings I personally use: var str = ''; as later on I can do. ", 'We\'re safely using an apostrophe in single quotes. Disconnect vertical tab connector from PCB. Examples of frauds discovered because someone tried to mimic a random sequence. Template literals make coding simple, concise, neat, and readable. Template literals offer one of the easiest ways to embed variables in a sentence. const newString = "This is a string assigned to a variable."; Now that the newString variable contains our string, we can reference it and print it to the . It also offers support for including expressions directly in the string and leave the compiler to resolve the calculations at run time. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. I want to be able to quit Finder but can't edit Finder's Info.plist after disabling SIP, Typesetting Malayalam in xelatex & lualatex gives error, Counterexamples to differentiation under integral sign, revisited. This placeholder is %d. I don't think JS falls short of lambdas or related tools of functional programming. First argument is the string that wanted to be parameterized. They are . If a string with a number is sent, then only that number will be returned as the output. How to get a variable name as a string in PHP? The process of creating a variable is also known as declaring a variable. index.js. \n) are not. $ {foo}) are processed, but escape sequences (e.g. This only works if the variable name is known of course. If myFirstName is passed to a function (containing this code) as argument v, then variableName is reported as v instead of myFirstName. Sorted by: 30. Try Cloudways with $100 in free credit! Instead of converting the variable name into a string, I convert a string into a variable. We have a normal string ready. That's not obtaining the variable name from the variable itself. Example. Live Demo I use as Raynos said: const poem = "The black river"; const author = "Joseph Troll"; const favePoem = `My favorite poem is ${poem} by ${author}\.`; Or you can use: console.log('%s is %d. example : for getting multi variables names in global scope. The following code set has a variety of use cases for doing so. maybe for that you could store in a variable and later convert it to json for example {"instanceA": instanceA} and send it to the server using ajax or get/post call and that you can process in php and get name of the instance @deceze, sure, you know the name, but that doesn't mean you can/want to type it in manually. When multiple clients passed from the parse, the "str" was mixed up. which is the correct way to initialize variables if my variable will be used . Not really the best looking thing, but it gets the job done. Hence, we cannot use it for assigning to a different variable, and we can not use it to display the new resolved string in HTML UI. Using {} brackets within backticks ``. In the following example, all the above-mentioned methods were used to convert a value to a string and the final result was displayed as shown in the output. Not the answer you're looking for? To learn more, see our tips on writing great answers. Here we're using the window.prompt() function, which asks the user to answer a question via a popup dialog box then stores the text they enter inside a given variable in this case name.We then use the window.alert() function to display another popup containing a string which inserts the name into a generic greeting message. Connect and share knowledge within a single location that is structured and easy to search. For example if the first line was, This actually works pretty well! There are 5 ways to convert a value to a string. var string = stringInject("this is a {0} string for {1}", ["test", "stringInject"]); which will replace the {0} and {1} with the array items and return the following string "this is a test string for stringInject" or you could replace placeholders with object keys and values like so: Storing a String in a Variable. 1. FYI 2021 and this syntax is still very much supported! did anything serious ever run on the speccy? However, I think you should do like "karim79". That's basically the best you'll get since it's not supported directly by the language as it is in python. console.log('%s', value) also should work. toString() String() Example. With that, we can create a funcion capable of settiing multiple outputs by value, reading from terminal arguments: This answer is similar to [@SethWhite's] (, is it possible to make function that will accept variable and print it's name? The rubber protection cover does not pass through the hole in the rim. Using the JavaScript console.log (), we can avoid concatenation and add placeholders in the targetted string. That's definitely micro-optimization. Something can be done or not a fit? Great spot. It has the same functionality as holding the string text in double-quotes ". It offers an easier way to embed variables in a given sentence than having to use cumbersome string concatenations. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? Sign up ->, Creating and Viewing the Output of Strings, Escaping Quotes and Apostrophes in Strings, Tutorial Series: How To Code in JavaScript, 1/37 How To Use the JavaScript Developer Console, 3/37 How To Write Your First JavaScript Program, 4/37 Understanding Syntax and Code Structure in JavaScript, 6/37 Understanding Data Types in JavaScript, 7/37 How To Work with Strings in JavaScript, 8/37 How To Index, Split, and Manipulate Strings in JavaScript, 9/37 How To Convert Data Types in JavaScript, 10/37 Understanding Variables, Scope, and Hoisting in JavaScript, 11/37 How To Do Math in JavaScript with Operators, 12/37 Understanding Comparison and Logical Operators in JavaScript, 14/37 How To Use Array Methods in JavaScript: Mutator Methods, 15/37 How To Use Array Methods in JavaScript: Accessor Methods, 16/37 How To Use Array Methods in JavaScript: Iteration Methods, 17/37 Understanding Objects in JavaScript, 18/37 Understanding Date and Time in JavaScript, 20/37 How To Work with JSON in JavaScript, 21/37 How To Write Conditional Statements in JavaScript, 22/37 How To Use the Switch Statement in JavaScript, 23/37 Using While Loops and DoWhile Loops in JavaScript, 24/37 For Loops, ForOf Loops and ForIn Loops in JavaScript, 25/37 How To Define Functions in JavaScript, 26/37 Understanding Prototypes and Inheritance in JavaScript, 27/37 Understanding Classes in JavaScript, 28/37 How To Use Object Methods in JavaScript, 29/37 Understanding This, Bind, Call, and Apply in JavaScript, 30/37 Understanding Map and Set Objects in JavaScript, 31/37 Understanding Generators in JavaScript, 32/37 Understanding Default Parameters in JavaScript, 33/37 Understanding Destructuring, Rest Parameters, and Spread Syntax in JavaScript, 34/37 Understanding Template Literals in JavaScript, 35/37 Understanding Arrow Functions in JavaScript, 36/37 Understanding the Event Loop, Callbacks, Promises, and Async/Await in JavaScript, 37/37 Understanding Modules and Import and Export Statements in JavaScript, Next in series: How To Index, Split, and Manipulate Strings in JavaScript ->. const example = 'world'; const result = 'hello ' + example; console.log(result); // 'hello world'. Find centralized, trusted content and collaborate around the technologies you use most. Is there a way to get a variable name as a string in Javascript? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. But for declaring a string variable we had to put the string . More details and more capabilitie about it: Template literals are string literals at mozilla.org. It is how echmascript (javascript) knows how to inject variables into. This means that a JavaScript variable can hold a value of any data type. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals. A few ways to extend String.prototype, or use ES2015 template literals. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Whether it is a string or a number, use the var, let, or const keyword for its declaration. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, ECMAScript template literals like 'some ${string}' are not working. The conversion does not happen. Not the answer you're looking for? How could my characters be tricked into thinking they are on Mars? This is a good point, but the question is about string interpolation. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? By creating a format function. I wrote a function which solves the problem precisely. How do I test for an empty JavaScript object? @avalanche1, according to MDN version compatibility table. How do I remove a property from a JavaScript object? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Like Seth's answer, but uses Object.keys() instead: You can use the following solution to solve your problem: Typically, you would use a hash table for a situation where you want to map a name to some value, and be able to retrieve both. I created this function to do exactly this, it will allow you to pass in a string, and an object with keys that will replace placeholder values in the string with their values like below: If for some reason you are doing this many times per second and referencing the strings many times per call, you can always store the strings themselves as variables. @WakanTanka If yo create a proper question, I'll answer it there. If you like to have formated text you can do it as described above by Felix Kling. Before Template Literals in ES6 of JavaScript, the development community followed the feature-rich library of sprintf.js. three lines.". let text = "John Doe"; Try it Yourself . Strings are immutable in JavaScript as well. result: You can reflect on types in javascript and get the name of properties and methods but what you need is sth like Lambda Expressions Trees in .NET, I think it's not be possible due to dynamic nature and lack of static type system in javascript. You can be very creative in naming your variables, but you don't want to get too crazy. How many transistors at minimum do you need to build a general-purpose computer? It's used to get the raw string form of template literals that is, substitutions (e.g. As you discovered, it will just print the name you give the function argument. for example, if we have a string value 'helloworld', we are going to convert this sting to the variable as helloworld. Formatting string in javascript is best done by the use of backticks ( ``) and the variables are inserted within the backticks wrapped in curly . Not sure if it was just me or something she sent to the whole team. What's the best way to do insert variables in a string in JavaScript? The values to be assigned are passed as arguments as shown below. The usage is as follows. null, undefined, empty string or 0 are all falsy values so to check if they are defined. Try this worked for me. if you are using ES6, the you should use the Template literals. Use a Javascript object literal: var obj = { a: 1, b: 2, c: 'hello' }; You can then traverse it like this: for (var key in obj) { console.log (key, obj [key]); } And access properties on the object like this: console.log (obj.a, obj.c); a compiled piece of code. Asking for help, clarification, or responding to other answers. parseInt () function returns Nan ( not a number) when the string doesn't contain number. Variables in JavaScript are containers that hold reusable data. I think the only reason this "doesn't answer the question" is because it doesn't start with "You cannot get the name of the constant or a variable in JavaScript. @WakanTanka no, that would not work. telegram bot send message with javascript. Is there any reason on passenger airliners not to have a physical lock between throttles? Is there really a JS interpreter that won't inline all of the raw strings? Passing values from react components to constants file, var functionName = function() {} vs function functionName() {}. Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? This leverages ES6's object destructuring. How do I replace all occurrences of a string in JavaScript? In this post, we will discuss how to convert a string into a variable in javascript. Instead of using quotes (double quotes or single quotes), we use template literals defined with the backticks (` character in keyboard). The concept of template literals has been around for a while in JavaScript. Pretty sure you accidentally transposed the variables. This "template string" example that i have showed IS a "template string" that uses a Multi-line String Literal. If we require inserting values in the output string only for logging purposes, the console.log() function of JavaScript is useful. This worked using Internet Explorer (9, 10 and 11), Google Chrome 5: Browser compatibility table: You will need call the function with a single element array containing the variable. ", "We're safely using an apostrophe in double quotes. The addition (+) operator is used to concatenate strings or sum numbers. This resolution of variables into values works only with console.log(). Another way of neatly inserting the variable values into our string is by using the basic formatting supported in JavaScript. If you're looking for something quick and dirty, this might work: No, there is not. How do I include a JavaScript file in another JavaScript file? Why does parameter value in url_for() have to be a string? The way you have it written, I would expect it to set str to be "My username is Github on tjcafferkey". read more here: Plus 1 Because we are in 2017 and ES6 is basically standard in the node world. So I use the string "height" and turn that into a variable height using the window[] command. Like the functionality of template literals, It has support for various formats. I'm trying to connect a browser and another program using JavaScript. JAVA String urlString = "https://api. A variable is only a name given to a memory location, all the operations done on the variable effects that memory location. This function won't accept spaces. 'hello' + myVar. What does "use strict" do in JavaScript, and what is the reasoning behind it? ]*$)(\w+)/g)[0], I get undefined from: var a={b:"c"}; alert(name(a)); function name(exp) { exp.toString().match(/(?=[^. We place the string in the backticks and embed our variables in the sentence. What's the best way to do insert variables in a string in JavaScript? This is now (2017) the correct answer. This isn't able to be made into a function as it returns the name of the function's variable. I'm pretty sure there are also libraries out there which provide a function like this. Finally, we stored a value of string data type there. or you could use this gist. However, we can use single quotes if we are encapsulating the entire structure in double-quotes. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals. Is there a verb meaning depthify (getting more depth)? printNameValue(()=> myNiceVariable ) Besides, if you can write variablesName(myFirstName), you already know the variable name ("myFirstName"). To create a variable in JavaScript, use the let keyword. If variable position changes in that string, this function supports it too without changing the function parameters. How to insert variables in JavaScript strings? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Get a string from any valid Javascript (variable, class): Probably pop would be better than indexing with [0], for safety (variable might be null). You mean ! I feel like this might be, Agreed, I'd expect it to be slower. More info here: https://hacks.mozilla.org/2015/05/es6-in-depth-destructuring/. To declare a variable in JavaScript, use the var command. Format String Using Backticks. A small bolt/nut came off my mtn bike while washing it, can someone help me identify it? It is the strings with javascript in continuation with having to use the double quotes or backticks over and over again as we would do with concatenating sentences: Another way of neatly inserting the variable values into our string is by using the basic formatting supported in JavaScript. We used the addition (+) operator to concatenate a string to a . Using the JavaScript console.log(), we can avoid concatenation and add placeholders in the targetted string. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? We can use expressions in the parameters, as we saw in the case of (op1 + op2). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I think it helps to see how such a function would compile to an older Javascript spec. The statement below creates (in other words: declares) a variable with the name "message": let message; Now, we can put some data into it by using the assignment operator =: We really should be able to wiki-hijack old questions to keep them updated. also if you are testing a primitive, it will alert all the variables that have the same value, or if two variables have the same object assigned to them. How to turn variable name into string in JS? More details can be found in the Read.me file specified in their GitHub link. Check if a variable is a string in JavaScript. How can I remove a specific item from an array? You need to wrap string within ` (backtick) instead of ' (apostrophe) Plus 1 Because we are in 2017 and ES6 is basically standard in the node world. How do I return the response from an asynchronous call? The closest thing to what you want", like this other answer: Great answer!! JavaScript will try to typecast the variable, and it will add the resultant value to the string. How to check whether a string contains a substring in JavaScript? Add a comment. This is nice, the template literals aren't exactly same thing. let carName2 = 'Volvo XC60'; // Single quotes. Please have a look over the code example and the steps given below. How to set a newcommand to be incompressible by justification? "tilt ` instead of single quote '" you save may day :), What do you mean "Its not possible" ? Also you can't safely store that "pattern" in a retrieval system (like a config file or DB) and inject in the value of user later. Send Messages to a Telegram Bot from a JCL Job that Executes on. This is now (2017) the correct answer. String.raw () The static String.raw () method is a tag function of template literals. 3 Answers. Nice, thanks for the tip! I needed this, don't want to use objects, and came up with the following solution, turning the question around. This article will introduce how to insert variable(s) into a string in JavaScript. Shortest way I have found so far to get the variables name as a string: Since ECMAScript 5.1 you can use Object.keys to get the names of all properties from an object. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. How do I replace all occurrences of a string in JavaScript? Here the given variable name is of string data type, and hence the return value was boolean true. All JavaScript variables must be identified with unique names. The div element is just a wrapper for the rest of the elements. The following piece of code has the eggCount variable embedded in a usual string, with this entire content is encapsulated in backticks. There are many more features that this library offers. let str="helloworld" function convertToVariable (str) { // helloworld="newHelloworld" } Multiple ways we can convert to a variable. It has the formatting options included by default. Well, this is the function that will play the main role to create variable name from our string. Ruby is similar and has a nice way of doing the above: Does something similar exist for JavaScript? Are the S&P 500 and Dow Jones Industrial Average securities? To do this task, we will use the JavaScript eval () function. To declare variables in JavaScript, you need to use the var, let, or const keyword. I've created this function based on JSON as someone suggested, works fine for my debug needs. I've suggested to the node.js developers that it would be really useful to make it clear on pages such as, Fell for the backticks trap myself, thanks for the comment ;), What if my string is a part of configuration file. But that comes at a small cost of getting familiarized with the library. Connect and share knowledge within a single location that is structured and easy to search. For instance, for displaying a numeric value, the placeholder in the sentence should be. Can virent/viret mean "green" in an adjectival sense. In this case, we can not use Double quotes in the final string without using the escape characters. If we need to do certain operations like summing, getting substrings, including dates, etc., all these functionalities and much more can be embedded into a string with template literals. Users need to use the curly brace with the . Example 2 At what point in the prequels is it revealed that Palpatine is Darth Sidious? To convert a string to an integer parseInt (), Number (), and Unary operator (+) function is used in javascript. How do I split the definition of a long string over multiple lines? This is a string The value of template literals can be assigned to a new variable. Find centralized, trusted content and collaborate around the technologies you use most. rev2022.12.9.43105. It is the basic unit of storage in a program. const getVarNameFromObject = (nameObject) => { return Object.keys(nameObject)[0]; }; This is the only answer out of the numerous answers here that worked for me as My 'object' was replicating a C# enum eg: `var myEnum = {A:1, B:5, C:27}, Could you update your answer and create a. How to use querySelectorAll with a variable? When it comes to including the variable values to your string without going for the tedious string concatenations using the + and double quotes, your best option will be to go for Template Literals, the feature with backticks. I'm guessing it's not this: var coordinates = "x: " + x + ", y: " + y; In Java, Strings are immutable and doing something like the above would unnecessarily create and throw away Strings. central limit theorem replacing radical n with n. How to smoothen the round border of a created buffer to make it look more natural? We can assign the value of a string to a named variable. I know Java compiler does such optimization. Will single quotes work? Ready to optimize your JavaScript with Rust? race conditions) when used in a multi-threaded setting include:. ]*$)(\w+)/g)[0]; } // name. It has its implementations for Node.js and browsers. Steps. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? This one does a pretty good job. Edit: Object.keys can be referenced as just keys in every browser I tested it in but according to the comments it doesn't work everywhere. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Address it if and when you need that extra tiny bit of performance or memory optimization, but in distributed software, you probably don't. Be aware that you will need Babel in your toolchain to support older browsers. There could be any number of variables on the window object with the same value. Maybe you want to dump a bunch of variables for debugging purposes and don't feel like manually typing. But if you want to keep the two in only one variable, but still be able to access them later, you could make an object container: function Container () { this . @Mat I understand the code, but generally the OP question is used for something more complex as dynamic assignations where you can select the variable from a generated string. Not necessarily true if the code is being minified ;), var test = 1235125142; console.log(Object.keys({test}).pop()) // "test", @bluejayke Call me ignorant, but after 8 years I still fail to see how that's any better than. Add a new light switch in line with another switch? Obtain closed paths using Tikz random decoration on circles. Upon click of a button, we will concatenate the string and the variable and display the result on the screen. CGAC2022 Day 10: Help Santa sort presents! It's absolutely not necessary to have a dependency if we don't need Lodash for something else, but, if we already have that dependency, we can make use of the _.isString () method, which returns true if the . Another example involving date is as follows. There is no good built-in equivalent of an sprintf or String.format, however, you can build your own. How do I put variables inside javascript strings? ", "This is a string\n\ Anyway underscores' templates do a pretty good job at that, Template strings were part of ES6 and that standard came around, and was implemented by browsers, well after 2013 when I posted this question. This particular use of object destructing is new to me (line 2. Nevertheless, you're correct and I will award you the check :). Unlike the mere string concatenation, with template literals, we can include expressions with more than one variable, similar to coding in JavaScript with the template literals. Is there a verb meaning depthify (getting more depth)? Web hosting without headaches. It will be part of v0.5.3 and can be used like this: As of node.js >4.0 it gets more compatible with ES6 standard, where string manipulation greatly improved. which denotes a delegate that is pretty much a pointer to a method, i.e. For setup and configurations, you can visit their git-hub page. Or where simply creating a dictionary to print a value is overkill. Variables in JavaScript are named containers that store a value, using the keywords var, const or let. The following code explains this phenomenon. Then we used the _.isString() function to check if the given variable is of string data type. We can now easily include single quotes and double quotes in a string without using escape characters. But I hope it gives you some idea. This only works if the variable name is known of course. Hence, here a string data type is being converted to a number. To learn more, see our tips on writing great answers. Find centralized, trusted content and collaborate around the technologies you use most. rev2022.12.9.43105. I feel that, because the user asked for this syntax specifically, it was worth mentioning in an answer. The easiest method to concatenate two strings is to use the template literals. The syntax for embedding the variable value is ${variableName}. What does "use strict" do in JavaScript, and what is the reasoning behind it? For those who would like to print variableName and variableValue for debugging purposes, here is a function: const myNiceVariable = 1234 MDN docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We are going to see the following 3 ways to format a string in javascript. Now see the example below: eval ("distance = 345"); console.log (distance); If we run these two lines of JavaScript code, then it will show the result given below: How to set a newcommand to be incompressible by justification? Hence the result returned is NaN, which we see as the end word of the output. How can I validate an email address in JavaScript? How do I console log the name of the object, rather than the contents? If we have to display the value of a variable in this string, we need to embed variables. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? str += 'some text'; and if I use null for example I get "nullsome text". To build a string in JavaScript, we can say that if we need to combine small portions of the string, like words, to make a complete sentence, we must require attaching all the given portions and generate a new resultant string. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? JavaScript is an untyped language. three lines. If you want to have something similar, you could create a function: This is only a simple example and does not take into account different kinds of data types (like %i, etc) or escaping of %s. See the following code. 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