The ES6 Map class
ECMAScript 2015 introduced a Map class as part of the JavaScript API. We developed our Dictionary class based on the ES6
Map class.
Note
You can take a look at the details of the ECMAScript 6 Map class implementation at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
(or http://goo.gl/dm8VP6
).
Now, let's consider how we can use the native Map class, as well.
Let's use the same examples we used to test our Dictionary class:
var map = new Map();
map.set('Gandalf', 'gandalf@email.com');
map.set('John', 'johnsnow@email.com');
map.set('Tyrion', 'tyrion@email.com');
console.log(map.has('Gandalf')); //outputs true
console.log(map.size); //outputs 3
console.log(map.keys()); //outputs ["Gandalf", "John", "Tyrion"]
console.log(map.values()); //outputs ["gandalf@email.com", "johnsnow@email.com", "tyrion@email.com"]
console.log(map.get('Tyrion')); //outputs tyrion@email.com
The difference between our Dictionary class and the ES6...
