Why this code doesn't return false?

This question already has an answer here:

How to short circuit Array.forEach like calling break? 24 answers

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The return false is the return of the anonymous function used in the forEach . So it does not return anything for every . If you want to use forEach and return false, you have to do like this :

function every(array, predictate) {
    var result = true;

    array.forEach(function(x) {
        if (!predictate(x)) {
            result = false;
        }
    });

    return result;
}

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Your return false statement is for the forEach callback function, not for the external every .

every will always return true unless you change it to something like:

function every(array, predictate){
    var retValue = true;
    array.forEach(function(x){
    if (!predictate(x))
        {
        retValue = false;
        }
    });
    return retValue;
}

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