solution.js

// 45: Map.prototype.get() (solution)
// To do: make all tests pass, leave the assert lines unchanged!

describe('`Map.prototype.get` returns the element from the map for a key', function(){

  it('`get(key)` returns the value stored for this key', function() {
    let map = new Map();
    map.set('key', 'value');

    const value = map.get('key');
    assert.equal(value, 'value');
  });

  it('multiple calls still return the same value', function() {
    let map = new Map();
    map.set('value', 'value');

    var value = map.get(map.get(map.get('value')));
    assert.equal(value, 'value');
  });

  it('requires exactly the value as passed to `set()`', function() {
    let map = new Map();
    const obj = {};
    map.set(obj, 'object is key');

    assert.equal(map.get(obj), 'object is key');
  });

  it('leave out the key, and you get the value set for the key `undefined` (void 0)', function() {
    let map = new Map();
    map.set(void 0, 'yo');

    const value = map.get();
    assert.equal(value, 'yo');
  });

  it('returns undefined for an unknown key', function() {
    let map = new Map();
    map.set(void 0, 1);

    const value = map.get('key');
    assert.equal(value, void 0);
  });

});