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How To Easily Convert A Javascript Array Into a Comma Separated String

Javascript · September 21, 2020

Some of you probably already knew this, but I only recently discovered this (accidentally) while building a wrapper around Postgresql queries in Node, and my mind is blown, to be honest.

Calling toString() on an array will automatically return the values within as a comma-separated string. Best of all, there will be no hanging comma and all whitespace is removed. Implementations based on join will have a space between the items, toString() on the array itself will not.

I have always used .join(', ') to create comma-separated strings from array values, but this is so much nicer.

const arr = [ 'username', 'email', 'firstName', 'lastName', 'password' ];
arr.toString();

There are a million ways you can comma separate an array of values into a string, you can use reduce, a for loop, the classic join method and probably a few others not mentioned. Why overcomplicate?

Dwayne

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Kevin Frey
Kevin Frey
2 years ago

I have to admit, don’t ever remember seeing a trailing comma from a .join( ) operation, and Mozilla docs don’t describe that in their documentation, either. Need to take a second look when I get time…

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