Array Utils

array.ts

// note: the existing item needs to appear after so that this can put stuff at the start of the array
// note: if an i > length is used, it will just be added to the last place
const insertAt = <T>(arr: T[], i:number, item: T) =>
	arr.slice(0, i).concat([item]).concat(arr.slice(i)); // prettier-ignore

const removeAt = <T>(arr: T[], i: number) =>
	arr.slice(0, i).concat(arr.slice(i + 1)) // prettier-ignore

const setAt = <T>(arr: T[], i: number, item: T) =>
	arr.slice(0, i).concat([item]).concat(arr.slice(i + 1)); // prettier-ignore