如何遍历数组，提供对元素，索引和数组本身的访问，而无需使用内置的Javascript函数

Question

I am working on a JS project where I cannot use any built in JS functions, I must code the solution myself. I cannot seem to get my below function to work. It should not return a value, but simply run the iterator function over each element in the array to provide access to the element, index and array itself. What am I doing wrong? (I am new to JS). I am looking for basic JS solution, not jQuery please.

Sorry, the whole code looks like this:

myForEach = function(collection, iterator) {
    for(var i = 0; i < collection.length; i++) {
        iterator(collection[i]);
    }
};

Answer 1

Give the function a name, and add the missing } at the end. Then add the additional arguments that you want to pass to the iterator.

 function runIterator(collection, iterator) { for (var i = 0; i < collection.length; i++) { iterator(collection[i], i, collection); } } runIterator([1, "foo", "bar"], function(x, i, c) { alert(x); });