javascript key value array notation | syntax code example

Example 1: js key value array

var myArray = {id1: 100, id2: 200, "tag with spaces": 300};
myArray.id3 = 400;
myArray["id4"] = 500;

for (var key in myArray) {
  console.log("key " + key + " has value " + myArray[key]);
}

Example 2: array of array key value javascript

var categories = [
    {"1":"Category 1"},
    {"2":"Category 2"},
    {"3":"Category 3"},
    {"4":"Category 4"}
];

Example 3: javascript associative array

/*
Associative array in javascript
There are multiple programming supports array and arrays is having different types i.e
1. Index Array
2. Associative Array
3. Multidimentional Array

But as question asked javascript does not support associative array with named indexes.
Javascript only use numbered indexes in arrays.
*/

Example
var studentDetail = [];
studentDetail[0] = "Code";
studentDetail[1] = "Grepper";
studentDetail[2] = 24;
studentDetail[3] = 'Mumbai';
var x = studentDetail.length;     // studentDetail.length will return 4
var y = studentDetail[1];         // studentDetail[0] will return "Grepper"

/*
I hope it will help you.
Namaste
Stay Safe Stay Home
*/