Question

I always put var keyword before every variable. I’m wondering about it’s correctness. Code is working, but is this good practice?

$(document).ready(function() {
    var something = 34;
    var v = $(body).find('p.lol');
    $.ajax({
        success: function(a) {
           var k = a.sdf;
           something = k+0.7;
           ...etc...

Answer 1

Actually, it is not about coding practice. If you define a variable in a function using
var keyword. it defined locally otherwise, the variable will be defined globally which you can access outside of the function.

function test(){
 var message = “hi”; //local variable
 variable = "bye";
}
 test();
 alert(message); //undefined
 alert(variable);//bye