fazlurr
6/30/2015 - 10:19 AM

Check is array have duplicates - https://blog.nraboy.com/2015/02/calculate-duplicates-exist-array-using-javascript/

Check is array have duplicates - https://blog.nraboy.com/2015/02/calculate-duplicates-exist-array-using-javascript/

isArrayHaveDuplicates.js
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var isArrayHaveDuplicates = function(a) {
    var counts = [];
    for(var i = 0; i <= a.length; i++) {
        if(counts[a[i]] === undefined) {
            counts[a[i]] = 1;
        } else {
            return true;
        }
    }
    return false;
}