给定一个露营地数组，返回数组中露营地的总数

Question

大家好，有人可以帮我看看我是否遗漏了什么。看来我无法将它们转换为数字。

//This is the data I have:

let campgrounds = [

  { number: 1, view: 'ocean', partySize: 8, isReserved: false },

  { number: 5, view: 'ocean', partySize: 4, isReserved: false },

  { number: 12, view: 'ocean', partySize: 4, isReserved: true },

  { number: 18, view: 'forest', partySize: 4, isReserved: false },

  { number: 23, view: 'forest', partySize: 4, isReserved: true }

];

//This is my code so far.

function campsiteCount(campgrounds) {

  let counter = 0;

  for(let i = 0; i < campgrounds.length; i++) {

    counter = counter + campgrounds[i];

  }

  return counter;

}

Answer 1

如果您实际上只想要露营地数组中的露营地数量，则可以使用：campgrounds.length就像你已经在 for 循环中一样如果出于某种原因您需要增加 for 循环中的计数（也许这是出于学习目的而给您的某种作业，当您在 for 循环初始化程序中使用campgrounds.length 时仍然看起来有点奇怪），您可以每次迭代时增加计数：function campsiteCount(campgrounds) {&nbsp; let counter = 0;&nbsp; for(let i = 0; i < campgrounds.length; i++) {&nbsp; &nbsp; counter++;&nbsp; }&nbsp; return counter;}或者，如果您想总结所有聚会规模，我想这可能就是您想要的？你会这样做：function campsiteCount(campgrounds) {&nbsp; let counter = 0;&nbsp; for(let i = 0; i < campgrounds.length; i++) {&nbsp; &nbsp; counter += campgrounds[i].partySize;&nbsp; }&nbsp; return counter;}

Answer 2

console.log(campgrounds.length);数组有一个.length属性可以告诉您数组中的项目数（您已经在 for 循环中使用了）。

Answer 3

//For future reference, this worked:function campsiteCount(campgrounds) {&nbsp; let counter = 0;&nbsp; for(let i = 0; i < campgrounds.length; i++) {&nbsp; &nbsp; counter = campgrounds.length;&nbsp; }&nbsp; return counter;}