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# Array - join()

Welcome back to my weekly Web Basics, a series on essential programming topics every web developer should absolutely know!

Today’s lesson is about join(). This method pieces all the item in an array and returns a new string.

The default separator if you don’t pass in anything is commas , To specify your own custom separator, you just pass it as the argument. Example: join('+')

const pieces = ['s', 'a', 'm'];

pieces.join('');
// 'sam'

# Examples

const strings = ['Web', 'Basics', '!'];

strings.join(); // default comma (,)
// 'Web,Basics,!'

strings.join(' '); // empty space
// 'Web Basics !'

strings.join('-'); // dash
// 'Web-Basics-!'

Let's look at some examples using numbers:

const numbers = [2, 10, 5];

numbers.join(' + '); // note the blank space before and after
// '2 + 10 + 5'

# Resources

Code Snippet of Array - join()

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