variables

JavaScript - Variables

Three ways to define variables in JavaScript.

1. let

   • can be declared only once.
   • can be defined multiple times.

   let firstName = "Ironman";

   • NOTE: camel case is used for let variable names.

2. const

   • can be declared and defined only once.
   • values of these variables are immutable where we cannot change them again.

   const PI = 3.14;

   • NOTE: uppercase is used for const variable names.

3. var

   • can be declared and defined multiple times.

   var age = 123;

   • NOTE: camel case is used for var variable names.