get Colour
Gets the colour at index index, or -1 if it doesn't exist.
Return
colour at that index, or -1 if it doesn't exist
Parameters
index
the index of the colour
Throws
if the index is below 0, or >= 5
Gets the colour at index index, or -1 if it doesn't exist.
colour at that index, or -1 if it doesn't exist
the index of the colour
if the index is below 0, or >= 5