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Revati S Misra

Revati S Misra

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Ashutosh Kumar Verma

Ashutosh Kumar Verma

26-Jun-2024

JavaScript Template Literals

Template literals introduced in ECMAScript 6 (ES6) provide a way to embed words and multiline strings in JavaScript. They provide a simpler and more readable syntax than traditional concatenation methods.

Syntax-

Template literals are enclosed by backticks (`) rather than single quotes (' ') or double quotes (" ").

let greeting = `Hello, world!`;

 

Features of Template Literals

Embedded Expressions
You can add JavaScript expressions to template literals using the ${} syntax.
Expressions in ${} are evaluated, converted to strings, and inserted into template literals.

let name = 'Alice';
console.log(`Hello, ${name}!`); // Output: "Hello, Alice!"

Multiline Strings
Template literals can span multiple lines without the need for \n and other escape characters.

let multiline = `This is
a multiline
string`;
console.log(multiline);
// Output:
	 "This is
	 a multiline
	 string"

Expression Interpolation
Template literals allow you to add variables and expressions directly to a string, making it easier to create strings with dynamic content.

let a = 10;
let b = 5;
console.log(`The sum of ${a} and ${b} is: ${a + b}.`);
// Output: "The sum of 10 and 5 is: 15."

 

Tagged Templates
Advanced functions use "tagged templates", where a function (tag) can process the template itself and its input before outputting the final string.

function myTag(strings, ...values) {
  console.log(strings); // Array of string literals
  console.log(values); // Array of interpolated values
  return 'Processed string'; // Processed result
}

let a = 10;
let b = 5;
let processed = myTag`The sum of ${a} and ${b} is ${a + b}.`;
console.log(processed); // Output: "Processed string"

 

Benefits of template literals

Readability- The readability of complex strings is improved by allowing variables and expressions to be entered directly.
Maintenance- Easy to maintain compared to traditional wiring methods.
Multiline Support- Simplifies multiple line wiring without complicated joins or nine line lines.

 

Compatibility

Template literals are supported in both modern browsers and versions of Node.js that support ES6 and later.

 

Also, Read: Explain the concept of prototypal inheritance in JavaScript.

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