Compile-time calculation: Difference between revisions
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You can also calculate all factorials for 1 to 20 before defining fact method :
<lang Oforth>20 seq map(#[ seq reduce(#*) ]) Constant new: ALLFACTS
func: fact(n) { n ifZero: [ 1 ] else: [ ALLFACTS at(n) ] }</lang>
=={{header|OxygenBasic}}==
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