Introduce ES6 syntax

[Ankush263]

A lot of these Algorithms use old ES syntax ie. using the "var" key-word, or an old way of function declaration......change this to ES6 syntax,

[mgechev]

I started the project way before this new syntax was a thing. Modernization sounds good. Would you want to take a stab?

[Ankush263]

Yes please, would you assign me to this task??