Map constructor
This method uses the map Constructor function to create the required JavaScript map.
Syntax:
const myMap = new Map()
// or
const myMap = new Map(iterable) // Iterable e.g., 2-d array
Example: In this example, we will create a Map from the 2-d array using a map constructor
const map1 = new Map([
["key1", "value1"],
["key2", "value2"],
["key3", "value3"],
]);
// Display the map
console.log(map1);
Output
Map(3) { 'key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3' }
How to Add a key/value Pair to Map in JavaScript ?
This article will demonstrate how we can add a key-value pair in the JavaScript map. JavaScript Map is a collection of key-value pairs in the same sequence they are inserted. These key values can be of primitive type or the JavaScript object.
All methods to add key-value pairs to the JavaScript Map:
Table of Content
- Map constructor
- Using map set() Method
- Using Map object and spread operator
- Using Array map() Method
- Using Object.entries() and Spread Operator
- Using Array.prototype.forEach()
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