Some important ideas from JavaScript

• JavaScript is a weakly and dynamically typed language, i.e. there is not much restriction with respect to handling different datatypes and .js code is not compiled and is directly interpreted.
  

• There is truthy and falsie values in JavaScript. I don't know if there are actually those words, but this idea is real. By default, any string other than empty string or number other than 0 is treated as truthy value in conditionals. This is also applicable to other datatypes too.
  

• Using square bracket notation [] for accessing object properties is significantly better, at least in my experience as it allows you to dynamically use it, whereas it is not possible with dot notation.