bind(), call(), and apply()

function multiply(a, b) {
  return a * b;
}

const multiplyByTwo = multiply.bind(null, 2);
console.log(multiplyByTwo(4));

Method chaining
Partial application
This demonstrates partial application using bind(): 1) Creates a new function with pre-set arguments, 2) First argument null is for this context (not used here), 3) Following arguments are permanently set in the new function, 4) Useful for creating specialized functions from more general ones, 5) Reduces the number of parameters needed in the resulting function, 6) Common functional programming technique for code reuse.
Function composition
Recursion