javascript方法内的参数答案

【问题标题】：Parameter inside a method for javascriptjavascript方法内的参数
【发布时间】：2020-05-29 05:33:34
【问题描述】：

function exerciseOne(){
  // Exercise One: In this exercise you are given an object called 'mathHelpers'
  // Within mathHelpers, create a method called 'double'
  // This method should take one parameter, a number, 
  // and it should return that number multiplied by two.
  let mathHelpers = {
    // Create double method in here.
    double: function(myNumber){
      myNumber * 2;
    }
  };
  return mathHelpers;
}

它回来了，这是不正确的。被困在这个问题上 90 分钟。我做错了什么？

这是我之前的代码

function exerciseOne(){
  // Exercise One: In this exercise you are given an object called 'mathHelpers'
  // Within mathHelpers, create a method called 'double'
  // This method should take one parameter, a number, 
  // and it should return that number multiplied by two.
  let mathHelpers = {
    // Create double method in here.

  };
  return mathHelpers;
}

【问题讨论】：

标签： methods parameters

【解决方案1】：

我想还是谢谢你，哈哈

function exerciseOne(){
  // Exercise One: In this exercise you are given an object called 'mathHelpers'
  // Within mathHelpers, create a method called 'double'
  // This method should take one parameter, a number, 
  // and it should return that number multiplied by two.
  let mathHelpers = {
    // Create double method in here.
    double: function(myNumber = 4){
      return myNumber * 2;
    }
  };
  return mathHelpers;
}

【讨论】：