How Can I Interpolate Variables into Strings in JavaScript Without Concatenation?

Interpolating Variables in Strings in JavaScript, Eliminating Concatenation

In programming languages like PHP, interpolating variables into strings using syntax like "$hello" is a concise and elegant approach. But can we achieve the same functionality in JavaScript without resorting to concatenation?

Introducing Template Literals, a feature introduced in ES2015 (ES6), which empowers JavaScript with the ability to embed expressions within strings enclosed by back-ticks (`) rather than double or single quotes.

For variable interpolation, the syntax is:

`String text ${expression}`

Example:

var a = 5;
var b = 10;
console.log(`Fifteen is ${a + b}.`);
// Output: "Fifteen is 15."

This not only avoids the need for concatenation but also accommodates multi-line strings without the need for awkward escaping techniques, greatly enhancing template construction.

Browser Support:

As newer syntax, Template Literals are not universally supported. For wide reach, consider transpiling your code to ES5 using Babel/Webpack.

Bonus:

IE8 offers a rudimentary form of string formatting within console.log:

console.log('%s is %d.', 'Fifteen', 15);
// Output: "Fifteen is 15."

Ultimately, Template Literals provide a robust and elegant solution for variable interpolation and multi-line string construction in JavaScript.

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