To use the keyboard for input you can use different methods. To know which key has been pressed, you need a so called keycode, and you can find out which keycode belongs to which key if you go to www.keycode.info and just press the key.
You can check inside the draw-function with an if-statement if a specific key is pressed or not.
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function draw() {
if (keyIsDown(65)) {
console.log("The key " + key + " is pressed");
}
}
In this example, we check if the key with the keycode 65 is pressend, which is a lowercase a.
But we can also override functions that are called if any key has been pressed or released. Similar to the mouse-buttons.
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function keyPressed() {
// Do something here
}
function keyReleased() {
// Do something else here
}