OpenEuphoria

Re: Discuss changing the behaviour of append()

• Posted by gimlet Jun 09, 2014
• 5187 views

Derek,

I was aware of the (inconsistent?) behaviour of one element sequences. You can have append do what you want by calling append as:

     append(S[1..1], 2) -- coercing S[1] to a sequence 

Some clarification.

sequence S = {0,1,2,3} 
 
? length(S[1..0])     -- 0 
? sequence(S[1..0])   -- true 
? atom(S[1..0])       -- false 
 
? length(S[1..1])     -- 1 
? sequence(S[1..1])   -- true (slice coerces sequence type) 
? atom(S[1..1])       -- false 
 
? length(S[1])        -- 1 (odd!) 
? sequence(S[1])      -- false (odd!) 
? atom(S[1])          -- true 
 
? append(S[1..1],2)   -- {0,2} 
? append(S[1],2)      -- error