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var hasOwn = Object.prototype.hasOwnProperty;
var toString = Object.prototype.toString;
var isFunction = function (fn) {
var isFunc = (typeof fn === 'function' && !(fn instanceof RegExp)) || toString.call(fn) === '[object Function]';
if (!isFunc && typeof window !== 'undefined') {
isFunc = fn === window.setTimeout || fn === window.alert || fn === window.confirm || fn === window.prompt;
}
return isFunc;
};
module.exports = function forEach(obj, fn) {
if (!isFunction(fn)) {
throw new TypeError('iterator must be a function');
}
var i, k,
isString = typeof obj === 'string',
l = obj.length,
context = arguments.length > 2 ? arguments[2] : null;
if (l === +l) {
for (i = 0; i < l; i++) {
if (context === null) {
fn(isString ? obj.charAt(i) : obj[i], i, obj);
} else {
fn.call(context, isString ? obj.charAt(i) : obj[i], i, obj);
}
}
} else {
for (k in obj) {
if (hasOwn.call(obj, k)) {
if (context === null) {
fn(obj[k], k, obj);
} else {
fn.call(context, obj[k], k, obj);
}
}
}
}
};
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