Alternative to array.some() method?

Question

Is there an alternative to using array.some()? I've had it in my code for a while but I just learned that its not supported by IE8.

My original code:

var list = ['Johny', 'Adam', 'Johny'];
var option = 'Johny';

var foundInList = list.some(function (el) {
    return el === option;
});

I could replace it with something like :

var test = false;
for (i = 0; i < list.length; i++){
    if (list[i] === option){
        test = true;
        break;
    }
}

But there may be a better way to do the same.

Please help. Thanks in Advance

PS: Here's a fiddle

you can refer http://stackoverflow.com/questions/2790001/fixing-javascript-array-functions-in-internet-explorer-indexof-foreach-etc and see the polyfill section here https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/some — ankur, May 22 '15 at 17:42

score 3 · Answer 1 · answered May 22 '15 at 17:40

I think your best solution here is just a bespoke for loop over the entries. Most array mutation methods are not supported in IE8. I would recommend not polyfilling to replace the function because your polyfill may not efficiently replace the function in modern browsers.

score 1 · Accepted Answer · answered May 22 '15 at 17:39

1

You can add your own some method

if (!Array.prototype.some)
{
    Array.prototype.some = function (func)
    {
        for (var i in this)
        {
           if (func(i)) return true;
        }
        return false;
    };
}

answered May 22 '15 at 17:39

JoshBerke

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Alternative to array.some() method?

2 Answers2