I have a JavaScript 'Map' like this one
let people = new Map();
people.set('1', 'jhon');
people.set('2', 'jasmein');
people.set('3', 'abdo');
I want some method to return a key by its value.
let jhonKey = people.getKey('jhon'); // jhonKey should be '1'
You could convert it to an array of entries (using [...people.entries()]
) and search for it within that array.
let people = new Map();
people.set('1', 'jhon');
people.set('2', 'jasmein');
people.set('3', 'abdo');
let jhonKeys = [...people.entries()]
.filter(({ 1: v }) => v === 'jhon')
.map(([k]) => k);
console.log(jhonKeys); // if empty, no key found otherwise all found keys.