JavaScript Program to Add Key/Value Pair to an Object

To understand this example, you should have the knowledge of the following JavaScript programming topics:

Example 1: Add Key/Value Pair to an Object Using Dot Notation

Output

{
    name: "Monica",
    age: 22,
    gender: "female",
    height: 5.4
}

In the above example, we add the new property height to the person object using the dot notation . i.e. person.height = 5.4;.

Output

{
    name: "Monica",
    age: 22,
    gender: "female",
    height: 5.4
}

In the above example, we add the new property height to the person object using the square bracket notation [] i.e. person['height'] = 5.4;.

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