Answer by Elell for How to count string occurrence in string?

Here is my solution, in 2022, using map() and filter() :

string = "Xanthous: A person with yellow hair. Her hair was very xanthous in colour."       count = string.split('').map((e,i) => { if(e === 'e') return i;}).filter(Boolean).length

Just for the fun of using these functions. The example counts the number of "e" in my string.

This is the same as using the match() function :

(string.match(/e/g)||[]).length

or simply the split() function:

string.split('e').length - 1

I think the best is to use match(), because it consumes less resources! My answer is just for fun and to show that there are many possibilities to solve this problem