Javascript Map set()

Introduction

The Javascript Map set() method adds or updates a key-value pair in Map object.

It returns the Map object. 

myMap.set(key, value)
  • key - the key of the element to add to the Map object.
  • value - the value of the element to add to the Map object.

Using set() 

let myMap = new Map();
console.log(myMap);/*from  w w  w . jav a2 s .c  o m*/
// Add new elements to the map
myMap.set('bar', 'foo');
console.log(myMap);
myMap.set('key', 'foo');
console.log(myMap);
myMap.set(1, 'foobar');
console.log(myMap);
// Update an element in the map
myMap.set('key', 'baz');
console.log(myMap);

Using the set() with chaining

The set() method returns back the same Map object, we can chain the set() method call: 

let myMap = new Map();
console.log(myMap);/*from ww w. j a  va 2  s  . co  m*/

// Add new elements to the map with chaining. 
myMap.set('bar', 'foo')
     .set(1, 'foobar')
     .set('key', 'foobar')
     .set(2, 'baz');

console.log(myMap);



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