Syntax error Finding content of arrays on the basis of specific property in JavaScript?

Finding content of arrays on the basis of specific property in JavaScript?

For this, you can use find() along with a map(). Let’s say we have student records with name, rollno and subject.

Example

var firstObject=
[
   { "FirstName": "David", "RollNo": "105", "Subject": "MongoDB" },
   { "FirstName": "Mike", "RollNo": "110", "Subject": "JavaScript"}
];
var secondObject= [
   { "FirstName": "Bob", "RollNo": "101", "Subject": "Java" },
   { "FirstName": "John", "RollNo": "110", "Subject": "MySQL" }
];
var output =
firstObject.map(first=>(secondObject.find(second=>second.RollNo==first.R
ollNo) || first));
console.log(output);

To run the above program, you need to use the following command −

node fileName.js

Here, my file name is demo33.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo33.js
[
   { FirstName: 'David', RollNo: '105', Subject: 'MongoDB' },
   { FirstName: 'John', RollNo: '110', Subject: 'MySQL' }
]
Updated on: 2020-09-01T11:25:40+05:30

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