How to recognize when to use : or = in JavaScript?

The colon (:) can be used when you want to define the property to an object while equal (=) can be used when you want to assign a value to a variable.

Example

Following is the code −

var studentDetails = {    "studentId": 101,    "studentName": "John",    "studentSubjectName": "Javascript",    "studentCountryName": "US" } console.log(studentDetails); var firstName = "David"; console.log(firstName);

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

node fileName.js.

Here, my file name is demo325.js.

Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo325.js {    studentId: 101,    studentName: 'John',    studentSubjectName: 'Javascript',    studentCountryName: 'US' } David