jiapengyu
36 lines
1.1 KiB
JavaScript
36 lines
1.1 KiB
JavaScript
import _curry2 from './internal/_curry2';
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import _dispatchable from './internal/_dispatchable';
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import _xfindLast from './internal/_xfindLast';
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/**
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* Returns the last element of the list which matches the predicate, or
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* `undefined` if no element matches.
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*
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* Acts as a transducer if a transformer is given in list position.
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*
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* @func
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* @memberOf R
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* @since v0.1.1
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* @category List
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* @sig (a -> Boolean) -> [a] -> a | undefined
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* @param {Function} fn The predicate function used to determine if the element is the
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* desired one.
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* @param {Array} list The array to consider.
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* @return {Object} The element found, or `undefined`.
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* @see R.transduce
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* @example
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*
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* var xs = [{a: 1, b: 0}, {a:1, b: 1}];
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* R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}
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* R.findLast(R.propEq('a', 4))(xs); //=> undefined
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*/
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var findLast = /*#__PURE__*/_curry2( /*#__PURE__*/_dispatchable([], _xfindLast, function findLast(fn, list) {
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var idx = list.length - 1;
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while (idx >= 0) {
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if (fn(list[idx])) {
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return list[idx];
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}
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idx -= 1;
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}
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}));
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export default findLast; |