46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
import _concat from "./internal/_concat.js";
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import _curry1 from "./internal/_curry1.js";
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import curryN from "./curryN.js";
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/**
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* As with `addIndex`, `addIndexRight` creates a new list iteration function
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* from an existing one by adding two new parameters to its callback function:
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* the current index, and the entire list.
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*
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* Unlike `addIndex`, `addIndexRight` iterates from the right to the left.
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*
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* @func
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* @memberOf R
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* @since v0.29.0
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* @category Function
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* @category List
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* @sig ((a ... -> b) ... -> [a] -> *) -> (a ..., Int, [a] -> b) ... -> [a] -> *)
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* @param {Function} fn A list iteration function that does not pass index or list to its callback
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* @return {Function} An altered list iteration function that passes (item, index, list) to its callback
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* @example
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*
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* const revmap = (fn, ary) => R.map(fn, R.reverse(ary));
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* const revmapIndexed = R.addIndexRight(revmap);
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* revmapIndexed((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']);
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* //=> [ '5-r', '4-a', '3-b', '2-o', '1-o', '0-f' ]
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*/
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var addIndexRight =
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/*#__PURE__*/
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_curry1(function addIndex(fn) {
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return curryN(fn.length, function () {
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var origFn = arguments[0];
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var list = arguments[arguments.length - 1];
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var idx = list.length - 1;
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var args = Array.prototype.slice.call(arguments, 0);
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args[0] = function () {
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var result = origFn.apply(this, _concat(arguments, [idx, list]));
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idx -= 1;
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return result;
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};
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return fn.apply(this, args);
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});
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});
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export default addIndexRight; |