[RESEARCH] Javascript/data structure: map

[developerasun]

topic : understanding difference between map and object in Javascript

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Objects vs. Maps Object is similar to Map—both let you set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. For this reason (and because there were no built-in alternatives), Object has been used as Map historically.

const map1 = new Map();

map1.set('a', 1);
map1.set('b', 2);
map1.set('c', 3);

console.log(map1.get('a'));
// expected output: 1

map1.set('a', 97);

console.log(map1.get('a'));
// expected output: 97

console.log(map1.size);
// expected output: 3

map1.delete('b');

console.log(map1.size);
// expected output: 2

However, there are important differences that make Map preferable in some cases:

• Map Performs better in scenarios involving frequent additions and removals of key-value pairs.
• The number of items in a Map is easily retrieved from its size property.
• A Map's keys can be any value (including functions, objects, or any primitive).

reference

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#try_it