Usage

isEqual(0, 0); // => true
isEqual(0, 1); // => false

Installation

CLI

npx atmx add helper is-equal

Manually

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

/**
* Return true if the given values are equal.
*
* To determine equality, `Object.is()` is used first. If it returns
* false, we do the following special checks:
* - `Date` and `Date` with the same time
* - `RegExp` and `RegExp` with the same pattern/flags
* - object with the same keys and values (recursive)
*
* @example
* isEqual(0, 0) // => true
* isEqual(0, 1) // => false
*/
export function isEqual<TType>(x: TType, y: TType): boolean {
if (Object.is(x, y)) {
return true;
}

if (x instanceof Date && y instanceof Date) {
return x.getTime() === y.getTime();
}

if (x instanceof RegExp && y instanceof RegExp) {
return x.toString() === y.toString();
}

if (
typeof x !== "object" ||
x === null ||
typeof y !== "object" ||
y === null
) {
return false;
}

const keysX = Reflect.ownKeys(x as unknown as object) as (keyof typeof x)[];
const keysY = Reflect.ownKeys(y as unknown as object);

if (keysX.length !== keysY.length) {
return false;
}

for (let i = 0; i < keysX.length; i++) {
if (!Reflect.has(y as unknown as object, keysX[i])) {
  return false;
}

if (!isEqual(x[keysX[i]], y[keysX[i]])) {
  return false;
}
}

return true;
}