What is Map Coercion in JavaScript ?
source link: https://www.geeksforgeeks.org/what-is-map-coercion-in-javascript/
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What is Map Coercion in JavaScript ?
In JavaScript, Map coercion refers to the automatic conversion of an object or an iterable (such as an array) into a Map using the Map constructor. This coercion happens implicitly when an object or iterable with key-value pairs is provided as an argument to the Map constructor.
Example: Here, the array keyValuePairs contains nested arrays representing key-value pairs. When this array is passed as an argument to the Map constructor, it is coerced into a Map, and the resulting Map (myMap) contains the key-value pairs from the array.
- Javascript
const keyValuePairs = [['key1', 'value1'],['key2', 'value2'],['key3', 'value3']];// Map coercion using the Map constructorconst myMap = new Map(keyValuePairs);console.log(myMap); |
Map(3) { 'key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3' }
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