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48 lines
1.5 KiB
TypeScript
48 lines
1.5 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/either.js
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import _curry2 from './internal/_curry2.js';
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import _isFunction from './internal/_isFunction.js';
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import lift from './lift.js';
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import or from './or.js';
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/**
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* A function wrapping calls to the two functions in an `||` operation,
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* returning the result of the first function if it is truth-y and the result
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* of the second function otherwise. Note that this is short-circuited,
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* meaning that the second function will not be invoked if the first returns a
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* truth-y value.
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*
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* In addition to functions, `R.either` also accepts any fantasy-land compatible
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* applicative functor.
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*
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* @func
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* @memberOf R
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* @since v0.12.0
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* @category Logic
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* @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
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* @param {Function} f a predicate
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* @param {Function} g another predicate
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* @return {Function} a function that applies its arguments to `f` and `g` and `||`s their outputs together.
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* @see R.both, R.or
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* @example
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*
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* const gt10 = x => x > 10;
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* const even = x => x % 2 === 0;
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* const f = R.either(gt10, even);
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* f(101); //=> true
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* f(8); //=> true
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*
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* R.either(Maybe.Just(false), Maybe.Just(55)); // => Maybe.Just(55)
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* R.either([false, false, 'a'], [11]) // => [11, 11, "a"]
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*/
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var either = _curry2(function either(f, g) {
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return _isFunction(f) ?
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function _either() {
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return f.apply(this, arguments) || g.apply(this, arguments);
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} :
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lift(or)(f, g);
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});
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export default either;
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