197 lines
1.9 KiB
Markdown
197 lines
1.9 KiB
Markdown
# RETRO Quick Reference
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Displaying Things
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-----------------
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Numbers
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=======
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#100 putn
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Characters
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==========
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$a putc
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Strings
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=======
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'hello,_world puts
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Mixed
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=====
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#1 #2 #3 '%n_-_%n_=_%n\n s:format puts
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'Charles' 'Hello_%s\n s:format puts
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Conditionals
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------------
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Equality
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========
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#2 #3 eq?
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Inequality
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==========
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#3 #4 -eq?
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Greather Than
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=============
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#3 #4 gt?
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Less Than
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=========
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#3 #4 lt?
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Greater Than or Equal To
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========================
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#3 #4 gteq?
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Less Than or Equal To
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=====================
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#3 #4 lteq?
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String Equality
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===============
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'hello 'world s:eq?
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String Inequality
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=================
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'hello 'world s:eq? not
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If / Then
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=========
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#1 #2 eq? [ 'true ] [ 'false ] choose
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#1 #2 eq? [ 'true ] if
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#1 #2 eq? [ 'false ] -if
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Multiple Comparisons
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====================
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[ @Base
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#8 [ 'octal ] case
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#10 [ 'decimal ] case
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#16 [ 'hexadecimal ] case
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drop (default_case)
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] call
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Function Defintions
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-------------------
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Quotes (Anonymous)
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==================
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[ (code) ]
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Quotes can be nested.
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Named
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=====
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:name (stack_comment)
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(code) ;
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Quotes can be nested inside a named function.
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Loops
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-----
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Unconditional
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=============
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repeat (code) again
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Conditional loops are generally preferable.
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Counted
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=======
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(simple,_no_index_on_stack)
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#10 [ $a putc ] times
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Conditional
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===========
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#10 [ n:dec dup putn dup n:-zero? ] while
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Math
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----
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Addition
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========
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#100 #200 +
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Subtraction
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===========
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#400 #32 -
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Multiplication
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==============
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#98 #12 *
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Division
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========
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#200 #4 /
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Remainder
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=========
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#203 #4 mod
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Power
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=====
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Raise 3 to the second power.
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#3 #2 n:pow
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Absolute Value
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==============
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#-76 n:abs
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Minimum and Maximum Value
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=========================
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#34 #8 n:min
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#34 #8 n:max
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