faeliaso

function wrapValue(n) {
  var localVariable = n;
  return function() { return localVariable; };
}

var wrap1 = wrapValue(1);
var wrap2 = wrapValue(2);
console.log(wrap1());
// 1
console.log(wrap2());

faeliaso

function multiplier(factor) {
  return function(number) {
    return number * factor;
  };
}

var twice = multiplier(2);
console.log(twice(5));
// 10

faeliaso

function greaterThan(n) {
  return function(m) { return m > n; };
}

var greaterThan10 = greaterThan(10);
console.log(greaterThan10(11));
// true

faeliaso

function greaterThan(n) {
  return function(m) { return m > n; };
}

var greaterThan10 = greaterThan(10)(20);
console.log(greaterThan10);
// true

faeliaso

var arr = [10,38,4,8,6,60,3];
console.log(arr.reduce(function(min, cur) {
  if(cur < min ) return cur;
  else return min
}));
// 3

faeliaso

Programas são pensamentos "cristalizados". Algumas vezes, esses pensamentos são confusos e
erros podem ser inseridos quando convertemos pensamentos em código, resultando em um programa com falhas.

faeliaso

var dayName = function() {
  var names = ["Sunday", "Monday", "Tuesday", "Wednesday",
               "Thursday", "Friday", "Saturday"];
  return function(number) {
    return names[number];
  };
}();

console.log(dayName(3));
// → Wednesday

faeliaso

(function() {
  function square(x) { return x * x; }
  var hundred = 100;

  console.log(square(hundred));
})();
// 10000

faeliaso

var weekDay = function() {
  var names = ["Sunday", "Monday", "Tuesday", "Wednesday",
               "Thursday", "Friday", "Saturday"];
  return {
    name: function(number) { return names[number]; },
    number: function(name) { return names.indexOf(name); }
  };
}();

console.log(weekDay.name(weekDay.number("Sunday")));

faeliaso

(function(exports) {
  var names = ["Sunday", "Monday", "Tuesday", "Wednesday",
               "Thursday", "Friday", "Saturday"];

  exports.name = function(number) {
    return names[number];
  };
  exports.number = function(name) {
    return names.indexOf(name);
  };