mythago - Raven Manual - Making Decisions

Raven Manual - Making Decisions

Those who know Forth's if ( flag -- ) and else ( -- ) will be at home. Just forget about then as the indentation handles the defining of code blocks.

# Integer comparison 
1 2 = 
if   'Equal' 
else 'Not Equal' 
 
# String comparison 
'hello' 'world' = 
if   'Equal' 
else 'Not Equal' 
 
# Regex testing 
'hello' m/[aeiou]/ 
if   'A vowel!' 
else 'No vowels :(' 
 
# Useful operators 
 
1 1 = && 2 2 = 
if   'Both equal' 
else 'One pair not equal' 
 
1 1 = || 2 2 = 
if   'One pair equal' 
else 'Neither pair equal'