Start on lazy seqs.
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src/koans/lazy_sequences.clj
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25
src/koans/lazy_sequences.clj
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(meditations
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"There are a wide range of ways to generate a sequence"
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(= __ (range 1 5))
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"The range starts at the beginning by default"
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(= __ (range 5))
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"It's important to only take what you need from a big sequence"
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(= [0 1 2 3 4 5 6 7 8 9]
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(take __ (range 100)))
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"You can also limit results by dropping what you don't need"
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(= [95 96 97 98 99]
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(drop __ (range 100)))
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"Iteration provides an infinite lazy sequence"
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(= __ (take 20 (iterate inc 0)))
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"Repetition is key"
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(= [:a :a :a :a :a :a :a :a :a :a ]
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(repeat 10 __))
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"Iteration can be used for repetition"
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(= (repeat 100 :foo)
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(take 100 (iterate ___ :foo))))
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@ -90,6 +90,14 @@
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"Hello, you silly world."
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"Hello to this group: Peter, Paul, Mary!" ]}
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"lazy_sequences" {"__" [[1 2 3 4]
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[0 1 2 3 4]
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10
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95
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'(range 20)
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:a]
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"___" ['(fn [x] :foo)]}
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"sequence_comprehensions" {"__" [[0 1 2 3 4 5]
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'(* index index)
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'(range 10)
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@ -29,6 +29,7 @@
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"conditionals"
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"higher_order_functions"
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"runtime_polymorphism"
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"lazy_sequences"
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"sequence_comprehensions"
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"creating_functions"
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"recursion"
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