Maps in JavaScript takes keys and values array and maps the values to the corresponding keys

Suppose we have two arrays −

const keys = [0, 4, 2, 3, 1];
const values = ["first", "second", "third", "fourth", "fifth"];

We are required to write a JavaScript function that takes in the keys and the values array and maps the values to the corresponding keys.

Therefore, the output should look like −

const map = {
   0 => 'first',
   4 => 'second',
   2 => 'third',
   3 => 'fourth',
   1 => 'fifth'
};

Therefore, let’s write the code for this function −

Example

The code for this will be −

const keys = [0, 4, 2, 3, 1];
const values = ["first", "second", "third", "fourth", "fifth"];
const buildMap = (keys, values) => {
   const map = new Map();
   for(let i = 0; i < keys.length; i++){
      map.set(keys[i], values[i]);
   };
   return map;
};
console.log(buildMap(keys, values));

Output

The output in the console will be −

Map(5) {
   0 => 'first',
   4 => 'second',
   2 => 'third',
   3 => 'fourth',
   1 => 'fifth'
}

AmitDiwan

Published on 21-Oct-2020 12:19:08