Fixing a number of arguments to a function, producing another function of smaller arity

partial-application.js

const partialApply = (fn, ...fixedArgs) => {
  return (...remainingArgs) => fn(...fixedArgs.concat(...remainingArgs));
};


const add = (a, b) => a + b;

const add10 = partialApply(add, 10);

console.log(add10(5)) // 15