Composition in js

composition.js

function display_param(fn, param) {
  console.log(fn(param));
}

function add_x_to_param(param) {
  return param+"x";
}

display_param(add_x_to_param, "yolo_swag_");

hof.js

function display (fn) {
  console.log(fn());
}

let get_param_x = function() {
  return "yolo_swag_x";
}

display(get_param_x);