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javascript - Javascript 对象数组，具有两个方法和两个调用函数

问题描述

我是 JavaScript 新手。我必须用两个方法和两个调用函数构建一个包含五个对象的数组。与我的一位 Web 开发人员朋友一起，我们创建了以下代码。然而，我不知道如何进一步进步。你们能帮我一把吗？

指示：

创建一个名为 actor 的变量，并为其分配一个由五个对象组成的数组，每个对象代表一个著名的演员。每个演员对象都应具有演员姓名、演员年龄和演员获得的奥斯卡奖数量的属性（您可以将此属性称为 oscars 或 numOscars）。这些是要使用的演员：

Leonardo DiCaprio (age 41, 1 Oscar)
Jennifer Lawrence (age 25, 1 Oscar)
Samuel L. Jackson (age 67, no Oscars)
Meryl Streep (age 66, 3 Oscars)
John Cho (age 43, no Oscars)

除了已经提到的三个属性外，每个actor对象还应该有以下两个方法：

hello - this method logs to the console the string "Hello, my name is "
    followed by the actor's name.

hasMoreOscarsThan - this method accepts one actor object as a parameter and
    returns true if the actor has more Oscars than the one that is passed as
    a parameter and false otherwise.

现在编写以下函数：

getActorByName - this function expects a string as a parameter and returns
    the object in the actors array whose name property is equal to the
    string that is passed in (if there is one).

getAverageAge - this function returns the average age of all the actors in
    the array.

您可以运行以下命令并验证输出。

var leo = getActorByName('Leonardo DiCaprio');
var jlaw = getActorByName('Jennifer Lawrence');
var jcho = getActorByName('John Cho');
var meryl = getActorByName('Meryl Streep');

jlaw.hasMoreOscarsThan(jcho);
jlaw.hasMoreOscarsThan(meryl);
leo.hasMoreOscarsThan(jlaw);

meryl.hello();
leo.hello();

getAverageAge();


var BaseActor = function ( actor_details ) {
    this.details = actor_details
    this.hello = function () {
      console.log(this.details.name)
    }
    this.hasMoreOscarsThan = function( otherActor ) {
      return this.details.oscars > otherActor.details.oscars
    }
}

function getActorByName(name) {
  console.log(name)
  var i;
  for (i = 0; i < actors.length; i++) {
    console.log(i, actors[i]);
    if (actors[i].name == name) {
      return actor[i]
    }
  }
  console.log('not found a shit', i)
  return false
}

var leo = new BaseActor({ id: 0, name: "Leonardo di Caprio", age: 41, oscars: 1, hello:"Hello, my name is Leonardo di Caprio"})
var jen = new BaseActor({ id: 1, name: "Jennifer Lawrence", age: 25, oscars: 1, hello:"Hello my name is Jennifer Lawrence"})
var sam = new BaseActor({ id: 2, name: "Samuel L. Jackson", age: 67, oscars: 0, hello:"Hello my name is Samuel L. Jackson"})
var meryl = new BaseActor({ id: 3, name: "Meryl Streep", age: 66, oscars: 3, hello:"Hello my name is Meryl Streep"})
var john = new BaseActor({ id: 4, name: "John Cho", age: 43, oscars: 0, hello:"Hello my name is John Cho"})

var actors = [
  leo,
  jen,
  sam,
  meryl,
  john
]

leo.hello()
console.log(leo.hasMoreOscarsThan(jen))
console.log(
  getActorByName("John Cho").id
)

标签： javascript

解决方案

您可以将数组减少为演员年龄的总和，然后将其除以数组的长度。

function getAverageAge() {
  return actors.reduce(//reduce actors array to sum of actor ages
    function(totalAge,actor){
      return totalAge + actor.details.age;
    },
    0//initial value is 0
  ) / actors.length
}

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