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// Copyright (c) 2020 Jozty. All rights reserved. MIT license.
import { concat } from './concat.ts';import curryN from './utils/curry_n.ts';import type { Func } from './utils/types.ts';import { getFunctionLength } from './utils/get.ts';
// @typestype AddIndex = (fn: Func) => Func;
function _addIndex(fn: Func) {  return curryN(getFunctionLength(fn), function (this: any) {    let index = 0;    const origFn = arguments[0];    const list = arguments[arguments.length - 1];    const args = [...arguments];
    args[0] = function () {      let result = origFn.apply(        this,        concat([...arguments], [index, list]),      );      index += 1;      return result;    };
    return fn.apply(this, args);  });}
/** * Returns a new iteration function from the passed function * by adding two more parameters to its callback function * 1. the current index * 2. the entire list * The passed function must have first argument as the iteration functions * and last arguments as the list * @function * *      const indexedMap = Fae.addIndex(Fae.map) *      indexedMap((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']) *      // ['0-f', '1-o', '2-o', '3-b', '4-a', '5-r'] */export const addIndex: AddIndex = curryN(1, _addIndex);