JAVASCRIPT VARIABLES


variables are containers for storing date. 

JavaScript variables can be declared into four ways they are:

  1. Automatically
  2. var
  3. let
  4. const 
NOTE:
  • var keyword was used in all JS code from 1995 to 2015.
  • let and const keyword were added to JS in 2015.
  • var should only be used in old browsers. 
WHERE TO USE var, let, const:
  • Use const if the value should not be changed. 
  • Use let if you can't use const.
  • use var if you must support old browsers.