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add new for comprehension example with :let #118

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Aug 4, 2025
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add new for comprehension example with :let #118

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2 changes: 2 additions & 0 deletions content/documentation/control-flow.md
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Expand Up @@ -146,6 +146,8 @@ have the form `:modifier argument`. The following modifiers are supported:
(for [[k v] :pairs [1 2 3]] [k v]) # Evaluates to [[0 1] [1 2] [2 3]]
(for [[k v] :pairs {:a 1 :b 2 :c 3} :reduce [m {}]]
(put m k (inc v))) # Evaluates to {:a 2 :b 3 :c 4}
(for [[k v] :pairs {:a 1 :b 2 :c 3} :reduce [m {}] :let [x (inc v)]]
(put m k x)) # Evaluates to {:a 2 :b 3 :c 4}

(for [x :in [2 2 2 3 3 4 5 6 6] :while (even? x)] x) # Evaluates to [2 2 2]
(for [x :in [2 2 2 3 3 4 5 6 6] :when (even? x)] x) # Evaluates to [2 2 2 4 6 6]
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