[vdec]

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§ 4.39  - [vdec] Built-InMnemonic aid: vdec for Variable DECrement
See also:  [gload] ,  [global] ,  [graw] ,  [gsave] ,  [gv] ,  [load] ,  [local] ,  [lv] ,  [page] ,  [raw] ,  [save] ,  [v]  and  [vinc] 
 [vdec]  decrements a variable. If quiet=1 is provided, then it will not generate any content. If pre=1, then it will produce the value of the variable before the increment. Otherwise it produces the value of the variable after the decrement.
 [vdec]  prefers a local variable, but if a local does not exist, then it will decrement a global if that exists.

[vdec (pre=1,)(quiet=1,)variableName]

1 [local x 4]
2 [vdec x]
3 [vdec pre=1,x]
4 [v x]
5 [vdec quiet=1,x]
6 [v x]
7 [vdec x]

1 
2 3
3 3
4 2
5 
6 1
7 0

1 
2 3
3 3
4 2
5 
6 1
7 0
Other built-ins used here:  [local]  and  [v] 

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