"use strict";

const isFunction = require("../../is/function");

const isObjTag = require("../../is/objTag");

const curry = require("../../fp/curry");

const keys = require("../../util/keys");

const preAllocate = require("../../array/preAllocate");

const reduce = require("./_reduce");
/**
 * @desc `while (index < list.length) push fn(list[index++])`
 * @name _map
 * @alias baseMaps
 * @since 5.0.0-beta.1
 * @memberOf loop
 *
 * {@link https://github.com/ramda/ramda/blob/master/src/internal/_map.js ramda-_map}
 * @see {@link ramda-_map}
 *
 * @param {Function} fn function to apply
 * @param {Function|List} functorList function/list
 * @return {Array}
 */


function _map(fn, functorList) {
  let idx = 0;
  const len = functorList.length;
  const result = preAllocate(len);

  while (idx < len) {
    result[idx] = fn(functorList[idx]);
    idx += 1;
  }

  return result;
}

function map(fn, functor) {
  if (isFunction(functor)) {
    return curry(functor.length, function () {
      return fn.call(this, functor.apply(this, arguments));
    });
  } else if (isObjTag(functor)) {
    return reduce(function (acc, key) {
      acc[key] = fn(functor[key]);
      return acc;
    }, {}, keys(functor));
  } else {
    return _map(fn, functor);
  }
}

module.exports = map;