Map Collection in ECMAScript

Demo 1

Create new Javascript file named demo1.js. This file contains code demo as below:

var student = new Map();
student.set('id', 'st01');
student.set('name', 'Name 1');
student.set('age', 20);

console.log('Size: ' + student.size);
console.log('Name: ' + student.get('name'));
console.log('Check Id Key: ' + student.has('id'));

student.delete('age');
console.log('Size: ' + student.size);

student.clear();
console.log('Size: ' + student.size);

Run Demo 1

Use node demo1.js statement run code demo

Size: 3
Name: Name 1
Check Id Key: true
Size: 2
Size: 0

Demo 2

Create new Javascript file named demo2.js. This file contains code demo as below:

var student = new Map();
student.set('id', 'st01');
student.set('name', 'Name 1');
student.set('age', 20);

console.log('Student Info');
student.forEach((value, key) => {
  console.log(key + ': ' + value);
});

let product = new Map([
  ['id', 'p01'],
  ['name', 'name 1'],
  ['price', 100]
]);

console.log('Product Info');
product.forEach((value, key) => {
  console.log(key + ': ' + value);
});

Run Demo 2

Use node demo2.js statement run code demo

Student Info
id: st01
name: Name 1
age: 20

Product Info
id: p01
name: name 1
price: 100