Check if a timeout has been cleared?

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Not directly, but you can create a wrapper object to give that functionality. A rough implementation is like so:

function Timeout(fn, interval) {
    var id = setTimeout(fn, interval);
    this.cleared = false;
    this.clear = function () {
        this.cleared = true;
        clearTimeout(id);
    };
}

Then you can do something like:

var t = new Timeout(function () {
    alert('this is a test');
}, 5000);
console.log(t.cleared); // false
t.clear();
console.log(t.cleared); // true

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