58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
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import _objectIs from "./internal/_objectIs.js";
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/**
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* Returns true if its arguments are identical, false otherwise. Values are
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* identical if they reference the same memory. `NaN` is identical to `NaN`;
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* `0` and `-0` are not identical.
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*
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* Note this is merely a curried version of ES6 `Object.is`.
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*
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* `identical` does not support the `__` placeholder.
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*
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* @func
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* @memberOf R
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* @since v0.15.0
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* @category Relation
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* @sig a -> a -> Boolean
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* @param {*} a
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* @param {*} b
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* @return {Boolean}
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* @example
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*
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* const o = {};
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* R.identical(o, o); //=> true
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* R.identical(1, 1); //=> true
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* R.identical(1, '1'); //=> false
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* R.identical([], []); //=> false
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* R.identical(0, -0); //=> false
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* R.identical(NaN, NaN); //=> true
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*/
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var identical = function (a, b) {
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switch (arguments.length) {
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case 0:
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return identical;
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case 1:
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return function () {
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return function unaryIdentical(_b) {
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switch (arguments.length) {
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case 0:
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return unaryIdentical;
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default:
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return _objectIs(a, _b);
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}
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};
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}();
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default:
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return _objectIs(a, b);
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}
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}; // In order to support Cross-origin Window objects as arguments to identical,
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// it cannot be implemented as _curry2(_objectIs).
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// The reason is that _curry2 checks if a function argument is the placeholder __
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// by accessing a paritcular property. However, across URL origins access
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// to most properties of Window is forbidden.
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export default identical;
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