JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="log" cols="50" rows="30">
</textarea>

JavaScript

var a, b, abort = false, logfield = $('#log');

function log(str) {
    logfield.append(str + "\n");
}

for (a = 0; a < 10 && !abort; a++) {
    log('"a" loop: ' + a);
    for (b = 0; b < 10 && !abort; b++) {
        log('\t"b" loop: ' + b);
        if (a === 1 && b === 3) {
            log('\t\tcondition met');
            //doSomeThing();
            abort = true;
        }
    }
}

log('both loops exited');