Javascript build trie from array-like

gistfile1.js

var reduce = Function.prototype.call.bind(Array.prototype.reduce);

var trie = (function(){
    var wordReduce = function(parent, l) {
        return (parent[l] = (parent[l] || {}));
    };
    var wordsReduce = function(trie, word) {
        var node = reduce(word, wordReduce, trie);
        node[''] = null;
        return trie;
    };
    return function(words) {
        return reduce(words, wordsReduce, {});
    };
}());

Converting word to a string on line 8 will alternatively allow words to be an array-like of objects with toString implementations instead of an array-like of array-likes.