👀 Views: 314 💬 Answers: 1 📅 Created: 2025-06-13

javascript map sorting es2022 JavaScript

I'm trying to implement I'm writing unit tests and Quick question that's been bugging me - I'm experiencing an scenario while trying to sort a `Map` object in JavaScript (using ES2022 features). I have a `Map` where the keys are strings and the values are objects containing numeric scores. My goal is to sort this `Map` based on the scores in descending order. However, the results seem to be inconsistent. Here’s a snippet of the code I've written: ```javascript const scores = new Map([ ['Alice', { score: 90 }], ['Bob', { score: 80 }], ['Charlie', { score: 85 }] ]); const sortedScores = new Map([...scores].sort((a, b) => { return b[1].score - a[1].score; })); console.log([...sortedScores]); ``` When I run this code, I expect the output to show the entries sorted as follows: ``` [ ['Alice', { score: 90 }], ['Charlie', { score: 85 }], ['Bob', { score: 80 }] ] ``` Instead, I sometimes see inconsistent ordering like this: ``` [ ['Bob', { score: 80 }], ['Alice', { score: 90 }], ['Charlie', { score: 85 }] ] ``` I've double-checked the score values, and they are correct. I also verified that the comparison logic should sort them properly. I suspect the scenario might be related to how `Map` maintains its insertion order when the sorting happens. Am I missing something or misusing `Map`? Also, would using a different data structure like an array or an object improve my sorting results? Any insights or best practices would be appreciated! This is my first time working with Javascript LTS. Any advice would be much appreciated. Any ideas what could be causing this?