Javascript (Bean count code)

function countBs(...args: [str: any]) {

    let count = 0;

    for (let i = 0; i < str.length; i++) {

        if (str.charAt(i) === chr) {




    return count;



Help me to understand this code

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

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Hey there!

Which parts DO you understand?
Which parts do you NOT understand?

This looks like a typescript code and incomplete with errors

like what about chr, is it a variable?

if it is then where is the declaration?

Similarly with str, it’s a type you have used for args but has also been used as variable