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Cool Code Snippets

The Y Combinator​

const Y = f => (x => x(x))(x => f(y => x(x)(y)));

It loops over a function a given number of times. For example, it can calculate Fibonacci sequences:

const Y = f => (x => x(x))(x => f(y => x(x)(y)));
const fib = f => n => n <= 1 ? n : f(n-1) + f(n-2);
let yFib = Y(fib);
yFib(10); // returns 55

Miscellaneous, and other Sites I Love​

  • Everything I Know - this site definitely inspired me to track and document all the stuff I learn and cool stuff I have discovered on the web.