Pretty much as the title asks, why is this code possible?

if (Physics2D.Raycast(...)) {


even though the method itself returns RaycastHit2D?


The answer to questions about the Unity API can generally be found in the docs:

RaycastHit2D implements an implicit conversion operator converting to bool which checks [the collider] property allowing it to be used as a simple condition check for whether a hit occurred or not.

What this means is that the RaycastHit2D structure's code looks something like this under the hood:

public struct RayCastHit2D {
    public Collider2D collider;

    public static implicit operator bool(RaycastHit2D hit) {
        return hit.collider != null;

This says to the compiler "wherever you see a RaycastHit2D used like a boolean, you can automatically convert it by running this method (which returns true if there was a collider hit, and false otherwise), without requiring the user to type out the cast or comparison explicitly.

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  • \$\begingroup\$ Thank you sir. This now makes perfect sense! \$\endgroup\$ – FICHEKK Dec 2 '19 at 20:17
  • \$\begingroup\$ Heh looks like I missed that part! \$\endgroup\$ – Vaillancourt Dec 2 '19 at 20:17

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