将属性添加到对象数组和对象数组中的通用项-JavaScript？
要添加属性，请使用map()。假设以下是我们的数组-
const firstname = ['John', 'David', 'Bob'];
以下是我们的对象数组-
const studentDetails = [
{
firstname: 'Carol',
marks: 78
},
{
firstname: 'Mike',
marks: 89
},
{
firstname: 'Bob',
marks: 86
}
];例
以下是代码-
const firstname = ['John', 'David', 'Bob'];
const studentDetails = [
{
firstname: 'Carol',
marks: 78
},
{
firstname: 'Mike',
marks: 89
},
{
firstname: 'Bob',
marks: 86
}
];
const data = new Set(firstname);
const result = studentDetails.map(tmpObject => {
if (data.has(tmpObject.firstname)) tmpObject.isPresent ="This is present";
else
tmpObject.isPresent = "This is not present";
return tmpObject;
});
console.log(result);要运行以上程序，您需要使用以下命令-
node fileName.js.
在这里，我的文件名为demo219.js。
输出结果
输出如下-
PS C:\Users\Amit\JavaScript-code> node demo219.js
[
{ firstname: 'Carol', marks: 78, isPresent: 'This is not present' },
{ firstname: 'Mike', marks: 89, isPresent: 'This is not present' },
{ firstname: 'Bob', marks: 86, isPresent: 'This is present' }
]