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UTILITY1
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MSWLGO35.ZIP
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LOGOLIB
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FOREACH
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1992-10-28
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667b
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24 lines
.macro foreach [:foreach.inputs] 2
catch "foreach.catchtag ~
[op foreach.done runresult ~
[foreach1 bl :foreach.inputs last :foreach.inputs 1]]
op []
end
to foreach1 :template.lists :foreach.template :template.number
if emptyp first :template.lists [throw "foreach.catchtag]
apply :foreach.template firsts :template.lists
.maybeoutput foreach1 bfs :template.lists :foreach.template :template.number+1
end
to foreach.done :foreach.result
if emptyp :foreach.result [op [stop]]
op list "output quoted first :foreach.result
end
to ?rest [:which 1]
output bf item :which :template.lists
end
bury [foreach foreach1 foreach.done ?rest]