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1.3.0

take-while

clojure.core

(take-while pred coll)

Returns a lazy sequence of successive items from coll while
(pred item) returns true. pred must be free of side-effects.

2 Examples top

link | changes
```
;; Calculate the sum of all numbers under 1000:
user=> (reduce + (take-while (partial > 1000 ) (iterate inc 0)))
499500
```
;; Calculate the sum of all numbers under 1000: user=> (reduce + (take-while (partial > 1000 ) (iterate inc 0))) 499500
link | changes
```
user=> (take-while neg? [-2 -1 0 1 2 3])
(-2 -1)

user=> (take-while neg? [-2 -1 0 -1 -2 3])
(-2 -1)

user=> (take-while neg? [ 0 1 2 3])
()

user=> (take-while neg? [])
()

user=> (take-while neg? nil)
()
```
user=> (take-while neg? [-2 -1 0 1 2 3]) (-2 -1) user=> (take-while neg? [-2 -1 0 -1 -2 3]) (-2 -1) user=> (take-while neg? [ 0 1 2 3]) () user=> (take-while neg? []) () user=> (take-while neg? nil) ()

Source clojure/core.clj:2502 top

(defn take-while
  "Returns a lazy sequence of successive items from coll while
  (pred item) returns true. pred must be free of side-effects."
  {:added "1.0"
   :static true}
  [pred coll]
  (lazy-seq
   (when-let [s (seq coll)]
       (when (pred (first s))
         (cons (first s) (take-while pred (rest s)))))))

Vars in clojure.core/take-while:

Used in 0 other vars

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Clojure Core

Namespaces

take-while

clojure.core

2 Examples top

See Also top

Source clojure/core.clj:2502 top

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