Immutable - change elements in array with slice (no splice)

Question

How is possible to change 3/4 elements? Expected output is [1,2,4,3,5]

let list = [1,2,3,4,5];
const removeElement = list.indexOf(3); // remove number 3
list         


        

Answer 1

The easer solution might be using filter instead of splice or slice. According to documentation https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

It means the original array stays immutable. The only difference is that in this case, you have to know the value you want to delete instead of index.

let list = [1,2,3,4,5];
list.filter((item) => item !== 3);