Queue/Definition: Difference between revisions
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(Added "when isMainModule". Moved "try" before the first "pop".) |
(Added Quackery.) |
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not fifo # empty |
not fifo # empty |
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fifo.pop() # raises IndexError when empty</lang> |
fifo.pop() # raises IndexError when empty</lang> |
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=={{header|Quackery}}== |
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<lang Quackery> [ [] ] is queue ( --> [ ) |
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[ [] = ] is empty? ( --> b ) |
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[ nested join ] is push ( [ x --> [ ) |
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[ dup empty? if |
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[ $ "Queue unexpectedly empty." |
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fail ] |
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behead ] is pop ( [ --> [ x )</lang> |
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{{out}} |
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Testing in the Quackery shell. |
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<pre>/O> queue |
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... 1111 push |
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... 2222 push |
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... 3333 push |
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... pop echo cr |
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... pop echo cr |
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... pop echo cr |
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... dup empty? if [ say "queue is enpty" cr ] |
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... pop echo cr |
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... |
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1111 |
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2222 |
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3333 |
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queue is enpty |
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Problem: Queue unexpectedly empty. |
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Quackery Stack: [ ] |
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Return stack: {[...] 0} {quackery 1} {[...] 11} {shell 5} {quackery 1} {[...] 20} {pop 3}</pre> |
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=={{header|R}}== |
=={{header|R}}== |
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