how to make key value pair in javascript code example

Example 1: javascript add to object

var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);

// Array of Objects in form {element: {id: 10, quantity: 10} }
var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push({element: element});

Example 2: key value pair array in javascript

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

Example 3: javascript create object from key value pairs

let items = 'key1:value1;key2:value2;key3:value3';
let items_array = items.split(';');
let final_items = items_array.map(item => item.split(':'));
// [ [ key1, value1 ], [ key2, value2 ], [ key3, value3 ] ]

let final_result = Object.fromEntries(final_items);
// { "key1" : "value1", "key2" : "value2", "key3" : "value3" }