How to Convert an Array to a String with Spaces in JavaScript

To convert an array to a string with spaces in JavaScript, call the join() method on the array, passing a string containing the space as an argument. For example:

const arr = ['coffee', 'milk', 'tea'];

const withSpaces = arr.join(' ');
console.log(withSpaces); // coffee milk tea

The Array join() method returns a string containing each array element concatenated with the specified separator. If no separator is passed as an argument, it will join the array elements with commas:

const arr = ['coffee', 'milk', 'tea'];

const str = arr.join();
console.log(str); // coffee,milk,tea

We can specify other separators apart from a space, like hyphens and slashes:

const arr = ['coffee', 'milk', 'tea'];

const withHypens = arr.join('-');
console.log(withHypens); // coffee-milk-tea

const withSlashes = arr.join('/');
console.log(withSlashes); // coffee/milk/tea

A separator can also contain more than one character. This allows us to separate the array elements with words or multiple spaces. For example:

const arr = ['coffee', 'milk', 'tea'];

const withAnd = arr.join(' and ');
console.log(withAnd); // coffee and milk and tea

const withOr = arr.join(' or ');
console.log(withOr); // coffee or milk or tea

const with2Spaces = arr.join('  ');
console.log(with2Spaces); // coffee  milk  tea

Note: If an element in the array is undefined, null, or an empty array ([]), it will be converted to an empty string ('') before concatenation with the separator. For example:

const arr = ['coffee', null, 'milk', []];

const withComma = arr.join(',');
console.log(withComma); // coffee,,milk,

const withSpaces = arr.join(' ');
console.log(withSpaces); // coffee  milk

11 Amazing New JavaScript Features in ES13

This guide will bring you up to speed with all the latest features added in ECMAScript 13. These powerful new features will modernize your JavaScript with shorter and more expressive code.