Usage

const a = { a: 1, b: 2, c: 3 };
mapEntries(a, (key, value) => [value, key]); // => { 1: 'a', 2: 'b', 3: 'c' }

Installation

CLI

npx atmx add helper map-entries

Manually

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

/**
* Map over all the keys to create a new object.
*
* @example
* const a = { a: 1, b: 2, c: 3 }
* mapEntries(a, (key, value) => [value, key]) // => { 1: 'a', 2: 'b', 3: 'c' }
*/
export function mapEntries<
TKey extends string | number | symbol,
TValue,
TNewKey extends string | number | symbol,
TNewValue,
>(
obj: Record<TKey, TValue>,
toEntry: (key: TKey, value: TValue) => [TNewKey, TNewValue],
): Record<TNewKey, TNewValue> {
if (!obj) {
return {} as Record<TNewKey, TNewValue>;
}

return Object.entries(obj).reduce(
(acc, [key, value]) => {
  const [newKey, newValue] = toEntry(key as TKey, value as TValue);
  acc[newKey] = newValue;
  return acc;
},
{} as Record<TNewKey, TNewValue>,
);
}