Lady’s Gitweb - Pisces/blob - object.js

   1 // ♓🌟 Piscēs ∷ object.js
   2 // ====================================================================
   3 //
   4 // Copyright © 2022 Lady [@ Lady’s Computer].
   5 //
   6 // This Source Code Form is subject to the terms of the Mozilla Public
   7 // License, v. 2.0. If a copy of the MPL was not distributed with this
   8 // file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
   9
  10 /** Returns whether the provided value is a constructor. */
  11 export const isConstructor = ($) => {
  12   if (!isObject($)) {
  13     // The provided value is not an object.
  14     return false;
  15   } else {
  16     // The provided value is an object.
  17     try {
  18       Reflect.construct(
  19         function () {},
  20         [],
  21         $,
  22       ); // will throw if $ is not a constructor
  23       return true;
  24     } catch {
  25       return false;
  26     }
  27   }
  28 };
  29
  30 /** Returns whether the provided value is an object. */
  31 export const isObject = ($) => {
  32   return $ !== null &&
  33     (typeof $ == "function" || typeof $ == "object");
  34 };
  35
  36 /**
  37  * Returns whether the provided object inherits from the prototype of
  38  * the provided function.
  39  */
  40 export const ordinaryHasInstance = Function.prototype.call.bind(
  41   Function.prototype[Symbol.hasInstance],
  42 );