Maps and Sets in javascript

Map:

To make a new Map, you can use the Map constructor:
new Map();

let bestBoxers = new Map();
bestBoxers.set(1, “The Champion”);

bestBoxers.set(2, “The Runner-up”);

bestBoxers.set(3, “The third place”);

console.log(bestBoxers);

output:
Map(3) {1 => ‘The Champion’, 2 => ‘The Runner-up’, 3 => ‘The third place’}

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to get a specific value
bestBoxers.get(1); // ‘The Champion’

Set:

A set is a collection of unique values.
To build a new set, you can use the Set constructor:
new Set();

const repetitiveFruits = [‘apple’,’pear’,’apple’,’pear’,’plum’, ‘apple’];

const uniqueFruits = new Set(repetitiveFruits);

console.log(uniqueFruits);

output:
{‘apple’, ‘pear’, ‘plum’}