30 lines
640 B
Markdown
30 lines
640 B
Markdown
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## infra
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(Combinator)
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Accept a quoted program and a list on the stack and run the program with
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the list as its stack. Does not affect the stack (below the list.)
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... [a b c] [Q] infra
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---------------------------
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c b a Q [...] swaack
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### Definition
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swons swaack [i] dip swaack
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### Discussion
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This is one of the more useful combinators. It allows a quoted
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expression to serve as a stack for a program, effectively running it in a
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kind of "pocket universe". If the list represents a datastructure then
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`infra` lets you work on its internal structure.
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### Crosslinks
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[swaack](#swaack)
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