MapFilter.js

// Definition of Map function
function Map(arr, func) {
    m_arr = [];
    for (var i = 0; i < arr.length; ++i)
        m_arr.push(func(arr[i]));
    return m_arr;
}

// Definition of Filter function
function Filter(arr, func) {
    f_arr = [];
    for (var i = 0; i < arr.length; ++i)
        if (func(arr[i]))
            f_arr.push(arr[i]);
    return f_arr;
}

/** EXAMPLES (with tasty juicy fruits) **/
var T = ["banana", "apple", "strawberry", "melon", "pineapple", "bob"];
console.log(T);
T = Filter(T, function (x) {
    return x.indexOf("a") > - 1;
});
console.log(T);
T = Map(T, function (x) {
    return x + x;
});
console.log(T);
T = Filter(T, function (x) {
    return x.length > 15;
});
console.log(T);
T = Map(T, function (x) {
    return x + "^^";
});
console.log(T);