foop/dist/deps/loop/map/mapObjOrArray.js

interfaces that describe their intentions.

var ENV_DEBUG = require('../../env/debug')
var isArray = require('../../is/array')
var curry = require('../../fp/curry')
var identity = require('../../fp/identity')
var emptyTarget = require('../../dopemerge/emptyTarget')
var defaultTo = require('../../cast/defaultTo')
var objOrArrayKeys = require('../../util/keysObjOrArray')
var size = require('../../util/size')

// const always = require('../../fp/always')
// pipe(nthArg(2), always)
var defaultKeyTransformer = function (value, key) { return key; }
var defaultValTransformer = identity

/**
 * @desc maps keys and vals
 *       probably needs a `mapArrayKeyVal` & `mapObjKeyVal`
 *       maybe `mapMap` haha
 *
 * @TODO this is huge perf killer just super easy util
 *
 * https://github.com/jashkenas/underscore/blob/master/underscore.js#L1021 underscore-map-obj
 * @alias mapAny
 * @memberOf loop
 * @since 5.0.0-beta.6
 */
function mapObjOrArray(obj, onValue, onKey, init) {
  var result = defaultTo(emptyTarget(obj), init)
  var valTransformer = defaultTo(defaultValTransformer, onValue)
  var keyTransformer = defaultTo(defaultKeyTransformer, onKey)

  var isArrayObj = isArray(obj)
  var keys = objOrArrayKeys(obj)

  if (ENV_DEBUG) {
    console.log('loop_mapObjOrArray', {keys: keys, result: result, isArrayObj: isArrayObj, obj: obj, init: init})
  }

  for (var index = 0; index < keys.length; index++) {
    var key = isArrayObj ? index : keys[index]
    var value = obj[key]

    if (ENV_DEBUG) {
      console.log('loop_mapObjOrArray', {key: key, value: value, obj: obj, index: index})
    }

    result[keyTransformer(value, key, obj)] = valTransformer(value, key, obj)
  }

  return result
}

module.exports = curry(2, mapObjOrArray)

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