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RaycastHit2D

RaycastHit2D implements the C# implicit bool operator. This allows it to be used in an if statement to check whether a hit is found.

RaycastHit2D hit = Physics2D.Raycast(someStartPoint, someDirection);
 
if(hit) {
    Debug.Log("yaaay I hit something!");
}

This is also valid:

RaycastHit2D hit = Physics2D.Raycast(someStartPoint, someDirection);
 
bool rayHitSomthing = hit;