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nedzadarek/default-set.red

Created January 25, 2019 11:28
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default-set.red
||=: make op! func ['a b] [either value? a [return get a] [set a b return b]]
a: 4
a ||= 3
; == 4
c ;*** Script Error: c has no value
c ||= 42
; == 42
c
; == 42
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