# baseEachRight

# Description

和 baseEach 类似，区别在于从右到左

# Params

(collection, iteratee)

{Array|Object} collection

iteratee - 每次迭代调用的函数

# Return

{Array|Object}

# Depend

import baseForOwnRight from './baseForOwnRight.js'
import isArrayLike from '../isArrayLike.js'

baseForOwnRight 源码分析

 isArrayLike 源码分析

# Code

function baseEachRight(collection, iteratee) {
  if (collection == null) {
    return collection
  }
  if (!isArrayLike(collection)) {
    return baseForOwnRight(collection, iteratee)
  }
  const iterable = Object(collection)
  let length = collection.length

  while (length--) {
    if (iteratee(iterable[length], length, iterable) === false) {
      break
    }
  }
  return collection
}

# Analyze

和 baseEach 类似，区别在于调用方法不同（baseForOwnRight），以及 while 循环条件为 length--，实现从右到左，使用 while 循环，依旧可以处理稀疏数组

# Remark

break MDN (opens new window)

# Example

const a = {a: 1, b: 2, c: 3}
const b = [1,2,3]
let c = 0;
let d = c;

baseEachRight(a, (val) => {c+=val})
baseEachRight(b, (val) => {d+=val})

console.log(c) // 6
console.log(d) // 6

← baseEach baseFindIndex →