Queue/Usage: Difference between revisions
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pop Q ;# ==> foo
peek Q ;# ==> bar</lang>
=={{header|Wart}}==
See [[FIFO#Wart|FIFO]] for implementation.
<pre>q <- (queue)
empty? q
=> 1
enq 1 q
empty? q
=> nil
enq 2 q
len q
=> 2
deq q
len q
=> 1</pre>
=={{header|XPL0}}==
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