prop.ts

// Copyright (c) 2020 Jozty. All rights reserved. MIT license.

import type { Obj, PH } from './utils/types.ts';
import { isArrayLike, isInteger, isUndefinedOrNull } from './utils/is.ts';
import { nth } from './nth.ts';
import curryN from './utils/curry_n.ts';

export type Prop = string | number;

// @types
type Prop_2 = <T>(obj: Obj<T> | ArrayLike<T>) => T | undefined;

type Prop_1<T> = (p: Prop) => T | undefined;

type PropF =
  & ((p: Prop) => Prop_2)
  & (<T>(p: PH, obj: Obj<T> | ArrayLike<T>) => Prop_1<T>)
  & (<T>(p: Prop, obj: Obj<T> | ArrayLike<T>) => T | undefined);

function _prop<T>(
  p: Prop,
  obj: Obj<T> | ArrayLike<T>,
): T | undefined {
  if (isUndefinedOrNull(obj)) return;
  // @ts-ignore
  return isInteger(p) && isArrayLike(obj) ? nth(p, obj) : obj[p];
}

/** Returns p property `p` on the `obj` if exists */
export const prop = curryN(2, _prop) as PropF;