It was the first to present the concept of creating a function without a superfluous keyword function, replacing it with something that in 2015 was to become the function arrow (=> in ES6, -> in CoffeeScript). He also got rid of the curly braces (like Python), replacing them with indentations. Often in CoffeeScript, you can omit (once required) parentheses, that often unnecessarily decrement the readability of the code.

I’ve been promising for many years and it turned out I couldn’t have fully designed it without the tools we do have now.