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Creating an associative array in JavaScript with push()?
For this, use forEach() loop along with push(). Following is the code −
Example
var studentDetails= [ { studentId:1, studentName:"John" }, { studentId:1, studentName:"David" }, { studentId:2, studentName:"Bob" }, { studentId:2, studentName:"Carol" } ] studentObject={}; studentDetails.forEach (function (obj){ studentObject[obj.studentId] = studentObject[obj.studentId] || []; studentObject[obj.studentId].push(obj.studentName); }); console.log(studentObject);
To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo116.js.
Output
This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo116.js { '1': [ 'John', 'David' ], '2': [ 'Bob', 'Carol' ] }
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