ramda/src/empty.js

A practical functional library for JavaScript programmers.

var _curry1 = /*#__PURE__*/require("./internal/_curry1.js");
var _isArguments = /*#__PURE__*/require("./internal/_isArguments.js");
var _isArray = /*#__PURE__*/require("./internal/_isArray.js");
var _isObject = /*#__PURE__*/require("./internal/_isObject.js");
var _isString = /*#__PURE__*/require("./internal/_isString.js");
var _isTypedArray = /*#__PURE__*/require("./internal/_isTypedArray.js");
/**
 * Returns the empty value of its argument's type. Ramda defines the empty
 * value of Array (`[]`), Object (`{}`), String (`''`), Map (`new Map()`), Set (`new Set()`),
 * TypedArray (`Uint8Array []`, `Float32Array []`, etc), and Arguments. Other
 * types are supported if they define `<Type>.empty`,
 * `<Type>.prototype.empty` or implement the
 * [FantasyLand Monoid spec](https://github.com/fantasyland/fantasy-land#monoid).
 *
 * Dispatches to the `empty` method of the first argument, if present.
 *
 * @func
 * @memberOf R
 * @since v0.3.0
 * @category Function
 * @sig a -> a
 * @param {*} x
 * @return {*}
 * @example
 *
 *      R.empty(Just(42));               //=> Nothing()
 *      R.empty([1, 2, 3]);              //=> []
 *      R.empty('unicorns');             //=> ''
 *      R.empty({x: 1, y: 2});           //=> {}
 *      R.empty(Uint8Array.from('123')); //=> Uint8Array []
 *      R.empty(Set);                    //=> Set()
 */
var empty = /*#__PURE__*/_curry1(function empty(x) {
  return x != null && typeof x['fantasy-land/empty'] === 'function' ? x['fantasy-land/empty']() : x != null && x.constructor != null && typeof x.constructor['fantasy-land/empty'] === 'function' ? x.constructor['fantasy-land/empty']() : x != null && typeof x.empty === 'function' ? x.empty() : x != null && x.constructor != null && typeof x.constructor.empty === 'function' ? x.constructor.empty() : x == Set || x instanceof Set ? new Set() : x == Map || x instanceof Map ? new Map() : _isArray(x) ? [] : _isString(x) ? '' : _isObject(x) ? {} : _isArguments(x) ? function () {
    return arguments;
  }() : _isTypedArray(x) ? x.constructor.from('') : void 0 // else
  ;
});
module.exports = empty;