Getting key with largest value from TypeScript Map

Question

If I have a Map, defined like so:

let map: Map<string, number> = new Map();

map.set("a", 12);
map.set("b", 124);
map.set("c", 14);
map.set("d", 155);

How would I get the key of the biggest value, in this case, the output would be "d"

I've tried a few answers that work with Object's(i.e {}) but none of those work since they access the object using obj[key].

Typescript Playground link with the code: here

uminder · Accepted Answer · 2021-04-09 14:44:35Z

1

Using Array.from() and Array.reduce(), this could be done as follows:

Array.from(map.entries()).reduce((a, b) => a[1] < b[1] ? b : a)[0];

answered Apr 9, 2021 at 14:44

uminder

26.4k6 gold badges45 silver badges91 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ben Wainwright · Accepted Answer · 2021-04-09 14:44:51Z

0

Here is one approach

Convert it to an array of key/value pairs
Sort the array by the value
Extract the second item of the first pair

Like so

let map: Map<string, number> = new Map();

map.set("a", 12);
map.set("b", 124);
map.set("c", 14);
map.set("d", 155);

const key = Array.from(map).sort((a, b) => (a[1] > b[1] ? -1 : 1))[0][0];

console.log(key);

answered Apr 9, 2021 at 14:44

Ben Wainwright

4,7111 gold badge22 silver badges42 bronze badges

Collectives™ on Stack Overflow

Getting key with largest value from TypeScript Map

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related