Javascript shorthand if

Question

if (event.keyCode === 38 || event.keyCode === 33 || event.keyCode === 40 || event.keyCode === 34) {
}

How to shorthand this code? Remember that con

Answer 1

Here's an improved solution that uses ES6 Array.prototype.includes():

[B, C].includes(A)

Your example:

[38, 33, 40, 34].includes(event.keyCode)