action-debian-package/node_modules/ramda/es/reduceRight.js
Dawid Dziurla 9308795b8b
update
2020-03-26 15:37:35 +01:00

58 lines
1.9 KiB
JavaScript

import _curry3 from "./internal/_curry3.js";
/**
* Returns a single item by iterating through the list, successively calling
* the iterator function and passing it an accumulator value and the current
* value from the array, and then passing the result to the next call.
*
* Similar to [`reduce`](#reduce), except moves through the input list from the
* right to the left.
*
* The iterator function receives two values: *(value, acc)*, while the arguments'
* order of `reduce`'s iterator function is *(acc, value)*.
*
* Note: `R.reduceRight` does not skip deleted or unassigned indices (sparse
* arrays), unlike the native `Array.prototype.reduceRight` method. For more details
* on this behavior, see:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight#Description
*
* @func
* @memberOf R
* @since v0.1.0
* @category List
* @sig ((a, b) -> b) -> b -> [a] -> b
* @param {Function} fn The iterator function. Receives two values, the current element from the array
* and the accumulator.
* @param {*} acc The accumulator value.
* @param {Array} list The list to iterate over.
* @return {*} The final, accumulated value.
* @see R.reduce, R.addIndex
* @example
*
* R.reduceRight(R.subtract, 0, [1, 2, 3, 4]) // => (1 - (2 - (3 - (4 - 0)))) = -2
* // - -2
* // / \ / \
* // 1 - 1 3
* // / \ / \
* // 2 - ==> 2 -1
* // / \ / \
* // 3 - 3 4
* // / \ / \
* // 4 0 4 0
*
* @symb R.reduceRight(f, a, [b, c, d]) = f(b, f(c, f(d, a)))
*/
var reduceRight =
/*#__PURE__*/
_curry3(function reduceRight(fn, acc, list) {
var idx = list.length - 1;
while (idx >= 0) {
acc = fn(list[idx], acc);
idx -= 1;
}
return acc;
});
export default reduceRight;