js__coffeescript__codeschool/lib/3-02-operators.js

/*

Operators
---------

  CoffeScript           JavaScript
  == is                 ===
  != isnt               !==
  not                   !
  and                   &&
  or                    ||
  true yes on           true
  false no off          false

*/
var Decaf, addCaffeine, base, base1, base2, coffee, cupsOfCoffee, level, message, paid, pour;

paid = coffee = pour = function() {};

if (paid() && coffee() === true) {
  pour();
}

addCaffeine = Decaf = function() {};

if (!Decaf()) {
  addCaffeine();
}

if (!Decaf()) {
  addCaffeine();
}

// Combined range checks
level = 4;

if ((2 < level && level < 5)) {
  alert("In range");
}

// Functional switch.
message = (function() {
  switch (cupsOfCoffee) {
    case 0:
      return 'Asleep';
    case 1:
      return 'Eyes open';
    case 2:
      return 'Buzzed';
    default:
      return 'Dangerous';
  }
})();

// Existential check: not undefined and not null.
if (typeof cupsOfCoffee !== "undefined" && cupsOfCoffee !== null) {
  alert('Exists');
}

if (typeof cupsOfCoffee !== "undefined" && cupsOfCoffee !== null) {
  alert('Exists');
}

// Not strictly identical to the two shorter forms below.
if (typeof cupsOfCoffee === "undefined" || cupsOfCoffee === null) {
  cupsOfCoffee = 0;
}

if (cupsOfCoffee == null) {
  cupsOfCoffee = 0;
}

if (cupsOfCoffee == null) {
  cupsOfCoffee = 0;
}

if (typeof coffeePot !== "undefined" && coffeePot !== null) {
  coffeePot.brew();
}

if (typeof vehicle.start_engine === "function") {
  if (typeof (base = vehicle.start_engine()).shift_gear === "function") {
    if (typeof (base1 = base.shift_gear()).crank === "function") {
      if (typeof (base2 = base1.crank()).press_gas === "function") {
        base2.press_gas();
      }
    }
  }
}

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