Keybindr - A small and easy way to bind callbacks to keys.

keybindr.js

      window.keybindr = (() => {
        // Declare set of keys that are pressed
        const keys = new Set();
        // Declare "associative array" of bindings to callback
        const bindings = [];
        function tokenizeKeys(keys){
          // Get array of different keys from string
          return keys.split("+");
        }
        window.addEventListener("keydown", ({key}) => {
          // Register that the key is being pressed
          keys.add(key);
          // Check if all the keys in a binding are pressed, and if so, call the callbacks.
          bindings.forEach(([binding, callback]) => {
            if(binding.every(k => keys.has(k))) {
              callback();
            }
          });
        });
        window.addEventListener("keyup", ({key}) => {
          //Register that the key has been released
          keys.delete(key);
        });
        return (keystr, binding) => {
          // Create a new binding
          bindings.push([tokenizeKeys(keystr), binding]);
        }
      })()