var or const in javascript

1// var declares a variable, meaning its value will vary. 
2// const declares a constant, meaning its value will remain 
3// consistant and not change. 
4// If your variable changes throughout the program or website, 
5// declare it using a var statement. 
6// Otherwise, if its value does not change, declare it using 
7// a const statement. 
8
9const myConst='A const does not change.';
10
11var myVar='A var does change.';
12
13var myVar=2;