45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
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import _curry2 from "./internal/_curry2.js";
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import _dispatchable from "./internal/_dispatchable.js";
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import _xfindLastIndex from "./internal/_xfindLastIndex.js";
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/**
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* Returns the index of the last element of the list which matches the
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* predicate, or `-1` 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] -> Number
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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 {Number} The index of the element found, or `-1`.
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* @see R.transduce
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* @example
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*
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* const xs = [{a: 1, b: 0}, {a:1, b: 1}];
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* R.findLastIndex(R.propEq('a', 1))(xs); //=> 1
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* R.findLastIndex(R.propEq('a', 4))(xs); //=> -1
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*/
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var findLastIndex =
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/*#__PURE__*/
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_curry2(
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/*#__PURE__*/
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_dispatchable([], _xfindLastIndex, function findLastIndex(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 idx;
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}
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idx -= 1;
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}
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return -1;
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}));
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export default findLastIndex;
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