How to implement guide with modifying array elements inside a promise in javascript - advanced patterns
I'm writing unit tests and I'm relatively new to this, so bear with me. I've searched everywhere and can't find a clear answer. I'm experiencing unexpected behavior when trying to modify elements of an array inside a JavaScript Promise. I'm using Node.js version 16.13.0 and have the following code snippet: ```javascript const myArray = [1, 2, 3, 4, 5]; function modifyArray() { return new Promise((resolve) => { setTimeout(() => { myArray.forEach((value, index) => { myArray[index] = value * 2; }); resolve(myArray); }, 1000); }); } modifyArray().then(result => { console.log('Modified Array:', result); console.log('Original Array:', myArray); }); ``` I expected that both `result` and `myArray` would log the modified array, but it seems I'm only seeing the modified values in the `result`. The output is: ``` Modified Array: [2, 4, 6, 8, 10] Original Array: [1, 2, 3, 4, 5] ``` It looks like the original array is not being updated as expected after the Promise resolves. I've tried checking the scope of `myArray` and ensuring that no other parts of the code are modifying it concurrently, but I need to seem to find the scenario. Could this be related to how Promises handle asynchronous operations, or is there something else I might be missing? Any insights would be appreciated! This is part of a larger API I'm building. What am I doing wrong? Any ideas what could be causing this? Thanks for any help you can provide! What's the best practice here? How would you solve this?