1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253
import _curry3 from './internal/_curry3.js';

/** * The `mapAccumRight` function behaves like a combination of map and reduce; it * applies a function to each element of a list, passing an accumulating * parameter from right to left, and returning a final value of this * accumulator together with the new list. * * Similar to [`mapAccum`](#mapAccum), except moves through the input list from * the right to the left. * * The iterator function receives two arguments, *acc* and *value*, and should * return a tuple *[acc, value]*. * * @func * @memberOf R * @since v0.10.0 * @category List * @sig ((acc, x) -> (acc, y)) -> acc -> [x] -> (acc, [y]) * @param {Function} fn The function to be called on every element of the input `list`. * @param {*} acc The accumulator value. * @param {Array} list The list to iterate over. * @return {*} The final, accumulated value. * @see R.addIndex, R.mapAccum * @example * *      const digits = ['1', '2', '3', '4']; *      const appender = (a, b) => [b + a, b + a]; * *      R.mapAccumRight(appender, 5, digits); //=> ['12345', ['12345', '2345', '345', '45']] * @symb R.mapAccumRight(f, a, [b, c, d]) = [ *   f(f(f(a, d)[0], c)[0], b)[0], *   [ *     f(a, d)[1], *     f(f(a, d)[0], c)[1], *     f(f(f(a, d)[0], c)[0], b)[1] *   ] * ] */var mapAccumRight = _curry3(function mapAccumRight(fn, acc, list) {  var idx = list.length - 1;  var result = [];  var tuple = [acc];  while (idx >= 0) {    tuple = fn(tuple[0], list[idx]);    result[idx] = tuple[1];    idx -= 1;  }  return [tuple[0], result];});export default mapAccumRight;