javascript - 循环遍历数组内的数组以确定值

Question

我需要使用 for 循环遍历以下数组，并确定该人的年龄是否为 18 岁及以上，或者是否低于 18 岁，并相应地记录一个字符串。

我一直在尝试一些不同的事情，比如:

var peopleWhoWantToSeeMadMaxFuryRoad = [
  {
    name: "Mike",
    age: 12,
    gender: "male"
  },{
    name: "Madeline",
    age: 80,
    gender: "female"
  },{
    name: "Cheryl",
    age: 22,
    gender: "female"
  },{
    name: "Sam",
    age: 30,
    gender: "male"
  },{
    name: "Suzy",
    age: 4,
    gender: "female"
  }
] 


for(var i = 0; i < peopleWhoWantToSeeMadMaxFuryRoad.length; i++){
    for(var j = 0; j < peopleWhoWantToSeeMadMaxFuryRoad[i].length; j++){
        if (j == 'number' && j < 18){
            console.log("person is under 18")
        }
    }
}

但我似乎无法理解。任何帮助将不胜感激

Answer 1

不需要双 for 循环，您可以通过单个 for 循环实现此目的:

for(var i = 0; i < peopleWhoWantToSeeMadMaxFuryRoad.length; i++){
    if(peopleWhoWantToSeeMadMaxFuryRoad[i].age < 18) {
        // Do something for underaged people;
    } else {
       // Do something for people over 18
    }
}

或者您可以使用 foreach 循环:

peopleWhoWantToSeeMadMaxFuryRoad.forEach(function(person) {
    if(person.age < 18) {
        // Do something for underaged people;
    } else {
        // Do something for people over 18
    }
});