Usage

set({}, "name", "ra"); // => { name: 'ra' }
set({}, "cards[0].value", 2); // => { cards: [{ value: 2 }] }

Installation

CLI

npx atmx add helper set

Manually

Copy and paste the following method into @/utils/helpers/undefined.ts:

import { clone } from "@/helpers/clone.ts";
import { isIntString } from "@/helpers/is-int-string.ts";

/**
* Opposite of get, dynamically set a nested value into an object
* using a key path. Does not modify the given initial object.
*
* @example
* set({}, 'name', 'ra') // => { name: 'ra' }
* set({}, 'cards[0].value', 2) // => { cards: [{ value: 2 }] }
*/
export function set<T extends object, K>(
initial: T,
path: string,
value: K,
): T {
if (!initial) {
return {} as T;
}

if (!path || value === undefined) {
return initial;
}

const root: any = clone(initial);
const keys = path.match(/[^.[\]]+/g);

if (keys) {
keys.reduce(
  (object, key, i) =>
    i < keys.length - 1
      ? (object[key] ??= isIntString(keys[i + 1]) ? [] : {})
      : (object[key] = value),
  root,
);
}

return root;
}