# 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
