提问人：Caelan Quigley 提问时间：10/5/2023 更新时间：10/5/2023 访问量：46
使用数组数据创建新字符串
Making new strings with array data
问：
我正在尝试解决这个问题，如果年龄> 18 岁，它返回名称 + 可以转到矩阵，或者如果年龄< 18 岁返回，则他们未成年：
function makeStrings(arr){
// your code here
}
console.log(makeStrings([
{
name: "Angelina Jolie",
age: 80
},
{
name: "Eric Jones",
age: 2
},
{
name: "Paris Hilton",
age: 5
},
{
name: "Kayne West",
age: 16
},
{
name: "Bob Ziroll",
age: 100
}
]));
// ["Angelina Jolie can go to The Matrix",
// "Eric Jones is under age!!",
// "Paris Hilton is under age!!",
// "Kayne West is under age!!",
// "Bob Ziroll can go to The Matrix"]
该练习来自array.prototype.map（）练习列表，因此，尽管我认为还有其他方法可以获得正确答案，但我已尝试使用map（）方法。到目前为止，我设法返回的只是一个语法错误或 [undefined，undefined，undefined，undefined，undefined]，这就是下面的代码返回的内容。
function makeStrings(arr){
// your code here
const map1 = arr.map((person) => {
if(person.age > 18){
person.name + " can go to The Matrix";
}
else {
person.name + "is underage!!";
}
});
return map1;
}
console.log(makeStrings([
{
name: "Angelina Jolie",
age: 80
},
{
name: "Eric Jones",
age: 2
},
{
name: "Paris Hilton",
age: 5
},
{
name: "Kayne West",
age: 16
},
{
name: "Bob Ziroll",
age: 100
}
]));
// ["Angelina Jolie can go to The Matrix",
// "Eric Jones is under age!!",
// "Paris Hilton is under age!!",
// "Kayne West is under age!!",
// "Bob Ziroll can go to The Matrix"]
答：
0赞
Ale_Bianco
10/5/2023
#1
可用于转换对象数组。但是，您的回调函数中有一个小错误。您不会在回调中返回字符串。map()map()
以下是更正后的代码：
function makeStrings(arr){
const map1 = arr.map((person) => {
if(person.age > 18){
return person.name + " can go to The Matrix";
}
else {
return person.name + " is under age!!";
}
});
return map1;
}
在原始代码中，您之前缺少该语句，因此 map 回调没有返回任何内容，从而导致 .returnperson.name + ...undefined
使用此更正后的代码，当您使用提供的数组运行时，您应该获得所需的输出：makeStrings
[
"Angelina Jolie can go to The Matrix",
"Eric Jones is under age!!",
"Paris Hilton is under age!!",
"Kayne West is under age!!",
"Bob Ziroll can go to The Matrix"
]
0赞
nesly
10/5/2023
#2
function makeStrings(arr) {
const result = [];
for (const person of arr) {
if (person.age >= 18) {
result.push(`${person.name} can go to The Matrix`);
} else {
result.push(`${person.name} is under age!!`);
}
}
return result;
}
console.log(makeStrings([
{
name: "Angelina Jolie",
age: 80
},
{
name: "Eric Jones",
age: 2
},
{
name: "Paris Hilton",
age: 5
},
{
name: "Kayne West",
age: 16
},
{
name: "Bob Ziroll",
age: 100
}
]));
你应该试试
评论
return person.name + " can go to The Matrix";return person.name + "is underage!!";makeStringsfunction makeStrings(arr) { return arr.map((person) => { if (person.age > 18) { return person.name + " can go to The Matrix"; } return person.name + "is underage!!"; }); }