Clarify empty lists & other list operations
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2e3fead03f
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@ -9,9 +9,11 @@
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["02_lists" {"__" [1 2 3 4 5
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1
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[2 3 4 5]
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3
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0
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()
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[:a :b :c :d :e]
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[0 :a :b :c :d :e]
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[:e :a :b :c :d]
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:a
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[:b :c :d :e]
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"No dice!"
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@ -8,14 +8,20 @@
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"As well as the rest"
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(= __ (rest '(1 2 3 4 5)))
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"The rest when nothing is left is empty"
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"Count your blessings"
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(= __ (count '(dracula dooku chocula)))
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"Before they are gone"
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(= __ (count '()))
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"The rest, when nothing is left, is empty"
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(= __ (rest '(100)))
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"And construction by adding an element to the front is simple"
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"Construction by adding an element to the front is easy"
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(= __ (cons :a '(:b :c :d :e)))
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"Conjoining an element to a list can be done in the reverse order"
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(= __ (conj '(:a :b :c :d :e) 0))
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"Conjoining an element to a list isn't hard either"
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(= __ (conj '(:a :b :c :d) :e))
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"You can use a list like a stack to get the first element"
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(= __ (peek '(:a :b :c :d :e)))
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@ -26,9 +32,12 @@
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"But watch out if you try to pop nothing"
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(= __ (try
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(pop '())
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(catch IllegalStateException e "No dice!")))
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(catch IllegalStateException e
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"No dice!")))
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"The rest of nothing isn't so strict"
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(= __ (try
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(rest '())
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(catch IllegalStateException e "No dice!"))))
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(catch IllegalStateException e
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"No dice!"))))
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