Introduction to JavaScript – Variables: String Interpolation II

In the newest version of JavaScript (ES6) we can insert variables into strings with ease, by doing two things:

1) Instead of using quotes around the string, use backticks (this key is usually located on the top of your keyboard, left of the 1 key (see images below).

Backtick key on most keyboards.

Backtick key on most keyboards.

Backtick key on Mac Keyboard

Backtick key on Mac Keyboard


2) Wrap your variable with ${myVariable}, followed by a sentence. No +s necessary.

ES6 string interpolation is easier than the method you used in our last exercise.

With ES6 interpolation we can insert variables directly into our text.

It looks like this:

let myPet = 'armadillo'
console.log(`I own a pet ${myPet}.`) //Since ES6, you can just do this.
// Output: 'I own a pet armadillo.'

The resulting string is:

I own a pet armadillo.


In the example above, the backticks ) wrap the entire string. The variable (myPet) is inserted using ${}.

Review: In computer programming, string interpolation (or variable interpolation, variable substitution, or variable expansion) is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placeholders are replaced with their corresponding values.

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