about_arrays.js

module('About Arrays (topics/about_arrays.js)');

test('array literal syntax and indexing', function () {
  var favouriteThings = ['cellar door', 42, true]; // note that array elements do not have to be of the same type
  equal(
    'cellar door',
    favouriteThings[0],
    'what is in the first position of the array?',
  );
  equal(42, favouriteThings[1], 'what is in the second position of the array?');
  equal(
    true,
    favouriteThings[2],
    'what is in the third position of the array?',
  );
});

test('array type', function () {
  equal('object', typeof [], 'what is the type of an array?');
});

test('length', function () {
  var collection = ['a', 'b', 'c'];
  equal(3, collection.length, 'what is the length of the collection array?');
});

test('splice', function () {
  var daysOfWeek = [
    'Monday',
    'Tuesday',
    'Wednesday',
    'Thursday',
    'Friday',
    'Saturday',
    'Sunday',
  ];
  var workingWeek = daysOfWeek.splice(0, 5);
  var weekend = daysOfWeek;

  deepEqual(
    workingWeek,
    ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'],
    'what is the value of workingWeek?',
  );
  deepEqual(weekend, ['Saturday', 'Sunday'], 'what is the value of weekend?');
});

test('stack methods', function () {
  var stack = [];
  stack.push('first');
  stack.push('second');

  equal(
    'second',
    stack.pop(),
    'what will be the first value popped off the stack?',
  );
  equal(
    'first',
    stack.pop(),
    'what will be the second value popped off the stack?',
  );
});

test('queue methods', function () {
  var queue = [];
  queue.push('first');
  queue.push('second');
  queue.unshift('third');

  equal('third', queue.shift(), 'what will be shifted out first?');
  equal('first', queue.shift(), 'what will be shifted out second?');
});