mout/src/function/makeIterator_.js

Modular Utilities

define(['./prop', '../object/deepMatches'], function(prop, deepMatches) {

    /**
     * Converts argument into a valid iterator.
     * Used internally on most array/object/collection methods that receives a
     * callback/iterator providing a shortcut syntax.
     */
    function makeIterator(src, thisObj){
        switch(typeof src) {
            case 'object':
                // typeof null == "object"
                return (src != null)? function(val, key, target){
                    return deepMatches(val, src);
                } : src;
            case 'string':
            case 'number':
                return prop(src);
            case 'function':
                if (typeof thisObj === 'undefined') {
                    return src;
                } else {
                    return function(val, i, arr){
                        return src.call(thisObj, val, i, arr);
                    };
                }
            default:
                return src;
        }
    }

    return makeIterator;

});