jiapengyu
30 lines
905 B
JavaScript
30 lines
905 B
JavaScript
import _curry3 from './internal/_curry3';
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/**
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* Makes a descending comparator function out of a function that returns a value
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* that can be compared with `<` and `>`.
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*
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* @func
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* @memberOf R
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* @since v0.23.0
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* @category Function
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* @sig Ord b => (a -> b) -> a -> a -> Number
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* @param {Function} fn A function of arity one that returns a value that can be compared
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* @param {*} a The first item to be compared.
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* @param {*} b The second item to be compared.
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* @return {Number} `-1` if fn(a) > fn(b), `1` if fn(b) > fn(a), otherwise `0`
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* @see R.ascend
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* @example
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*
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* var byAge = R.descend(R.prop('age'));
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* var people = [
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* // ...
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* ];
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* var peopleByOldestFirst = R.sort(byAge, people);
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*/
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var descend = /*#__PURE__*/_curry3(function descend(fn, a, b) {
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var aa = fn(a);
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var bb = fn(b);
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return aa > bb ? -1 : aa < bb ? 1 : 0;
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});
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export default descend; |