javascript string interpolation

Template literals are the standard way to perform string interpolation in modern JavaScript. They use backticks (`) instead of single or double quotes and allow you to embed expressions directly within strings using ${expression} syntax.

Key Features of Template Literals

Variable Interpolation: Embed variables directly.

const name = "Alice";
const message = `Hello, ${name}!`;
// Output: "Hello, Alice!"

Expression Support: Use any valid JavaScript expression inside ${}.

const a = 5;
const b = 10;
const result = `The sum is ${a + b}.`;
// Output: "The sum is 15."

Multi-line Strings: Preserve line breaks and whitespace without using \n.

const html = `
  <div>
    <h1>Hello</h1>
    <p>World</p>
  </div>
`;

Function Calls: Call functions directly within the template.

function getGreeting() {
  return "Welcome";
}
const greeting = `${getGreeting()}!`;

Browser Support

Template literals are supported in all modern browsers (ES6+), including Chrome 41+, Firefox 34+, Safari 9+, and Edge 13+.

✅ Best Practice: Always use template literals () for string interpolation instead of concatenation (+`) for better readability and maintainability.

String interpolation in JavaScript?

stackoverflow.com › questions › 1408289 › string-interpolation-in-javascript

Since ES6, you can use template literals:

const age = 3
console.log(`I'm ${age} years old!`)

P.S. Note the use of backticks: ``.

Answer from Damjan Pavlica on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 1408289 › string-interpolation-in-javascript

String interpolation in JavaScript? - Stack Overflow

tl;dr

Use ECMAScript 2015's Template String Literals, if applicable.

Explanation

There is no direct way to do it, as per ECMAScript 5 specifications, but ECMAScript 6 has template strings, which were also known as quasi-literals during the drafting of the spec. Use them like this:

> var n = 42;
undefined
> `foo${n}bar`
'foo42bar'

You can use any valid JavaScript expression inside the {}. For example:

> `foo${{name: 'Google'}.name}bar`
'fooGooglebar'
> `foo${1 + 3}bar`
'foo4bar'

The other important thing is, you don't have to worry about multi-line strings anymore. You can write them simply as

> `foo
...     bar`
'foo\n    bar'

Note: I used io.js v2.4.0 to evaluate all the template strings shown above. You can also use the latest Chrome to test the above shown examples.

Note: ES6 Specifications are now finalized, but have yet to be implemented by all major browsers.
According to the Mozilla Developer Network pages, this will be implemented for basic support starting in the following versions: Firefox 34, Chrome 41, Internet Explorer 12. If you're an Opera, Safari, or Internet Explorer user and are curious about this now, this test bed can be used to play around until everyone gets support for this.

MDN Web Docs

developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Template_literals

Template literals (Template strings) - JavaScript | MDN

Along with having normal strings, template literals can also contain other parts called placeholders, which are embedded expressions delimited by a dollar sign and curly braces: ${expression}. The strings and placeholders get passed to a function — either a default function, or a function you supply. The default function (when you don't supply your own) just performs string interpolation to do substitution of the placeholders and then concatenate the parts into a single string.

Discussions

TIL JavaScript provides string interpolation with string template literals

Next thing to learn is probably tagged templates I have never really used them outside of React styled-components so you probably won't see them much but it's good to know they exist More on reddit.com

r/ProgrammerTIL

October 2, 2023

I made a new string interpolation library (typed-string-interpolation)

Can understand the efforts to push for lower bundle size but I glanced at your code and the variable names are single letters :| Is this by design? More on reddit.com

r/typescript

June 28, 2023

Problem with Variable Passing in String Interpolation Function Arguments

Nesting string interpolations in the arguments of an interpolation is not supported. Use regular concatenation instead, e.g.:

"result="++matches(sample, expression["toMatch"])

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