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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: 01-Sep-2020
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