how to add a component in unity with script code example

Example 1: Add component object to gameobject unity

//to add a new ridgidbody
gameobject.AddComponent<Rigidbody>();
//to add a new meshCollider
gameobject.AddComponent<MeshCollider>();
//Original answer by MakerBenjammin6, cleanup by me.

Example 2: On add component unity

void Reset()
{
  //Your code here
}