JavaScript function that iterates over an object (Object or Array)

object-each.js

var Each = (function () {
    "use strict";
    
    var O, toString, is, ret;

    O = {};
    toString = O.toString;
    is = function (o, t) {
        return (toString.call(o) === "[object " + t + "]");
    };

    ret = function (obj, callback) {
        var result, curKey, curVal, len;
        if (is(obj, "Object")) {
            for (curKey in obj) {
                curVal = obj[curKey];
                result = callback.call(curVal, curKey, curVal);
                if (result === false) {
                    break;
                }
            }
        } else if (is(obj, "Array")) {
            for (curKey = 0, len = obj.length; curKey < len; curKey++) {
                curVal = obj[curKey];
                result = callback.call(curVal, curKey, curVal);
                if (result === false) {
                    break;
                }
            }
        }
    };

    return ret;
}());