Keyboard input (GetKey, GetKeyDown) in Unity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does Input.GetKey do in Unity?

Input.GetKey checks if a specific key is being held down during the current frame. It returns true as long as the key is pressed.

beginner

How is Input.GetKeyDown different from Input.GetKey?

Input.GetKeyDown returns true only on the exact frame when the key is first pressed down, unlike Input.GetKey which returns true while the key is held.

beginner

Write a simple Unity C# code snippet that prints "Jump!" once when the spacebar is pressed.

void Update() {
    if (Input.GetKeyDown(KeyCode.Space)) {
        Debug.Log("Jump!");
    }
}

intermediate

Why might you use Input.GetKeyDown instead of Input.GetKey for a jump action?

Because jumping usually happens once per key press, Input.GetKeyDown ensures the jump triggers only once when the key is pressed, avoiding repeated jumps while holding the key.

beginner

What will Input.GetKey(KeyCode.LeftArrow) return if the left arrow key is not pressed?

It will return false because the key is not being held down.

Which Unity input method returns true only on the frame a key is first pressed?

A Input.GetKeyDown

B Input.GetKey

C Input.GetKeyUp

D Input.GetButton

Input.GetKeyDown returns true only on the first frame the key is pressed.

What does Input.GetKey(KeyCode.A) return if the 'A' key is held down?

A False

B Only true on first frame

C True

D Only true on key release

Input.GetKey returns true as long as the key is held down.

If you want to detect when a key is released, which method should you use?

A Input.GetButtonDown

B Input.GetKey

C Input.GetKeyDown

D Input.GetKeyUp

Input.GetKeyUp returns true on the frame the key is released.

Which method would you use to check if the spacebar is currently pressed every frame?

A Input.GetKeyDown(KeyCode.Space)

B Input.GetKey(KeyCode.Space)

C Input.GetKeyUp(KeyCode.Space)

D Input.GetButtonDown("Jump")

Input.GetKey checks if the key is held down during the frame.

What will happen if you use Input.GetKeyDown inside Update() to move a character continuously while holding a key?

A Character moves only once per key press

B Character does not move

C Character moves continuously

D Character moves on key release

Input.GetKeyDown triggers only once per key press, so movement will happen once, not continuously.

Explain the difference between Input.GetKey and Input.GetKeyDown in Unity.

Think about holding a key versus pressing it once.

Describe a scenario in a game where using Input.GetKeyDown is better than Input.GetKey.

Consider actions that should not repeat if key is held.