Object.operator bool Manual     Reference     Scripting  
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Object.operator bool

static implicit function bool (exists : Object) : boolean

Description

Does the object exist?

JavaScript
// check if there is a rigidbody attached to this transform

if (rigidbody)
Debug.Log("Rigidbody attached to this transform");

is the same as
JavaScript
// another way to check if a rigidbody is attached to this transform

if (rigidbody != null)
Debug.Log("Rigidbody attached to this transform");