Avaq

//Combinators
const I = x => x;

//List manipulation
const head = xs => xs[0];
const tail = xs => xs.slice(1);
const append = x => xs => [...xs, x];

//Iteration
const foldl = f => y => xs => xs.length > 0 ? foldl(f)(f(y)(head(xs)))(tail(xs)) : y;