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var reduce = function(callback, initialValue, array) {
    var output = initialValue;
    for (var i = 0; i < array.length; i = i + 1) {
        output = callback(output, array[i]);
    }
    return output;
};

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var total = reduce(add, 0, numbers);
var sentence = reduce(joinWord, '', words);

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var total = numbers.reduce(add, 0);
var sentence = words.reduce(joinWord, '');

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var ponies = [
    [
        ['name', 'Fluttershy'],
        ['image', 'http://tinyurl.com/gpbnlf6'],
        ['description', 'Fluttershy is a female Pegasus pony and one of the main characters of My Little Pony Friendship is Magic.']
    ],
    [
        ['name', 'Applejack'],
        ['image', 'http://tinyurl.com/gkur8a6'],
        ['description', 'Applejack is a female Earth pony and one of the main characters of My Little Pony Friendship is Magic.']

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var addToObject = function(obj, arr) {
    obj[arr[0]] = arr[1]; // thêm thuộc tính cho obj
    return obj;
};

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var ponyArrayToObject = function(ponyArray) {
    return reduce(addToObject, {}, ponyArray);
};

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var tidyPonies = map(ponyArrayToObject, ponies);

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function t(s,o){
 for(var p in o)
   s=s.replace(new RegExp('{'+p+'}','g'), o[p]);
 return s;
}

var data = { name: "July", age: "seventeen" };
t("When {name} was just {age}!", data);
// "When July was just seventeen!"

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var ponyToListItem = function(pony) {
    var template = '<li><img src="{image}" alt="{name}"/>' +
                   '<div><h3>{name}</h3><p>{description}</p>' +
                   '</div></li>';
    return t(template, pony);
}

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var ponyList = map(ponyToListItem, tidyPonies);
var html = '<ul>' + reduce(joinWord, '', ponyList) + '</ul>';