In order to add key/value pair to a JavaScript object, Either we use dot notation or square bracket notation. Both methods are widely accepted.
Example 1: This example adds {“nextFavColor” : “red”} to the GFG_p object by using dot notation.
html
<h1 style="color:green;">
GeeksForGeeks
</h1>
<p id="GFG_up" style="color:red;"></p>
<button onclick="Geeks()">
Click to add
</button>
<p id="GFG_down" style="color:green;"></p>
<script>
var GFG_p = {fName:"Geeks", lName:"forGeeks",
age:100, favColor:"green"};
var p_up = document.getElementById("GFG_up");
var p_down = document.getElementById("GFG_down");
p_up.innerHTML = JSON.stringify(GFG_p);
function Geeks() {
GFG_p.nextFavColor = "Red";
p_down.innerHTML = JSON.stringify(GFG_p);
}
</script>
|
Output:
Example 2: This example adds {“thirdFavColor” : “blue”} to the GFG_p object by using square bracket notation.
html
<h1 style="color:green;">
GeeksforGeeks
</h1>
<p id="GFG_up" style="color:blue;"></p>
<button onclick="Geeks()">
Click to add
</button>
<p id="GFG_down" style="color:green;"></p>
<script>
var GFG_p = {fName:"Geeks", lName:"forGeeks",
age:100, favColor:"green"};
var p_up = document.getElementById("GFG_up");
var p_down = document.getElementById("GFG_down");
p_up.innerHTML = JSON.stringify(GFG_p);
function Geeks() {
GFG_p["thirdFavColor"] = "blue";
p_down.innerHTML = JSON.stringify(GFG_p);
}
</script>
|
Output: