Question

I am not too familiar with javascript. Can someone please explain this construct to me?

[{a:"asdfas"},{a:"ghdfh",i:54},{i:76,j:578}]

What does this construct declare? I can see that this is an array that consists of 3 elements, right? And every element in this array is a class, which is declared in JSON format, isn’t it? And I do not need to use any scripts to use JSON, do I?

Answer 1

It’s simply an array composed of 3 elements. Each element is an object. The first one has the a key with associated ‘asdfas’ value. The second one i key with 54 value etc etc

it could be built in this way :

var arr = []; //[] <= array

var first = {}; // {} <= object
first.a = "asdfas"; // object.key = value, same by doing var first = {a:"asdfas"}
arr.push(first); //pushing an object inside the array

//arr status: [{a:"asdfas"}]

var second = {};
second.a = "ghdfh";
second.i = 54;
arr.push(second);

//arr status: [{a:"asdfas"},{a:"ghdfh",i:54}]

var third = {};
third.i = 76;
third.j = 578;
arr.push(third);

//arr status: [{a:"asdfas"},{a:"ghdfh",i:54},{i:76,j:578}]

alert(arr[2].j) //third element of the array => object => key j => alerts j value 578