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61 lines
2.1 KiB
TypeScript
61 lines
2.1 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/empty.js
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import _curry1 from './internal/_curry1.js';
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import _isArguments from './internal/_isArguments.js';
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import _isArray from './internal/_isArray.js';
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import _isObject from './internal/_isObject.js';
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import _isString from './internal/_isString.js';
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import _isTypedArray from './internal/_isTypedArray.js';
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/**
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* Returns the empty value of its argument's type. Ramda defines the empty
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* value of Array (`[]`), Object (`{}`), String (`''`),
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* TypedArray (`Uint8Array []`, `Float32Array []`, etc), and Arguments. Other
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* types are supported if they define `<Type>.empty`,
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* `<Type>.prototype.empty` or implement the
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* [FantasyLand Monoid spec](https://github.com/fantasyland/fantasy-land#monoid).
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*
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* Dispatches to the `empty` method of the first argument, if present.
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*
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* @func
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* @memberOf R
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* @since v0.3.0
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* @category Function
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* @sig a -> a
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* @param {*} x
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* @return {*}
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* @example
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*
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* R.empty(Just(42)); //=> Nothing()
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* R.empty([1, 2, 3]); //=> []
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* R.empty('unicorns'); //=> ''
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* R.empty({x: 1, y: 2}); //=> {}
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* R.empty(Uint8Array.from('123')); //=> Uint8Array []
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*/
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var empty = _curry1(function empty(x) {
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return (
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(x != null && typeof x['fantasy-land/empty'] === 'function')
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? x['fantasy-land/empty']()
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: (x != null && x.constructor != null && typeof x.constructor['fantasy-land/empty'] === 'function')
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? x.constructor['fantasy-land/empty']()
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: (x != null && typeof x.empty === 'function')
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? x.empty()
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: (x != null && x.constructor != null && typeof x.constructor.empty === 'function')
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? x.constructor.empty()
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: _isArray(x)
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? []
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: _isString(x)
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? ''
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: _isObject(x)
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? {}
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: _isArguments(x)
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? (function() { return arguments; }())
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: _isTypedArray(x)
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? x.constructor.from('')
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: void 0 // else
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);
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});
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export default empty;
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