in_array analog in js

js_in_array.js

//Вхождение в массив
var in_array = function (needle, haystack, strict) {
    //original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    var found = false, key, strict = !!strict;
    for (key in haystack) {
        if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
            found = true;
            break;
        }
    }
    return found;
}