Discussion on: Daily Challenge #51 - Valid Curly Braces

Simple JS solution

Iterate through the string and count up when you encounter a "{" and down when not.
Check after every iteration, if the last character was a closing brace too much and return false if so.
Finally, return true when the amount of opening braces matches the amount of closing braces (i == 0).

function areCurlyBracesMatched(s){
    i = 0;
    for (el of s){
    i += "{" == el ? 1 : -1;
        if (i < 0) return false;
    }
    return !i
};