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36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/comparator.js
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import _curry1 from './internal/_curry1.js';
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/**
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* Makes a comparator function out of a function that reports whether the first
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* element is less than the second.
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*
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* @func
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* @memberOf R
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* @since v0.1.0
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* @category Function
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* @sig ((a, b) -> Boolean) -> ((a, b) -> Number)
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* @param {Function} pred A predicate function of arity two which will return `true` if the first argument
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* is less than the second, `false` otherwise
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* @return {Function} A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`
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* @example
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*
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* const byAge = R.comparator((a, b) => a.age < b.age);
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* const people = [
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* { name: 'Emma', age: 70 },
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* { name: 'Peter', age: 78 },
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* { name: 'Mikhail', age: 62 },
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* ];
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* const peopleByIncreasingAge = R.sort(byAge, people);
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* //=> [{ name: 'Mikhail', age: 62 },{ name: 'Emma', age: 70 }, { name: 'Peter', age: 78 }]
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*/
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var comparator = _curry1(function comparator(pred) {
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return function(a, b) {
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return pred(a, b) ? -1 : pred(b, a) ? 1 : 0;
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};
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});
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export default comparator;
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