using shortcuts in your javascript code example

Example 1: javascript variable shortcuts

// adds 1 to A
A++;
// subtracts 1 from A
A--;
// adds B to A
A += B;
// subtracts B from A
A -= B;
// multiplies A by B
A *= B;
// devides A by B
A \= B;

Example 2: js shortcut

document.addEventListener('keydown', (e) => {
  if (e.ctrlKey && String.fromCharCode(e.keyCode).toLowerCase() === 's') {
    e.preventDefault();
    e.stopPropagation();
    // Do some stuff...
  }
}, false);