clojure.core/iterator-seq

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Type: function Added: Clojure 1.0 Examples: 2 Runnable: 0

([iter])

Returns a seq on a java.util.Iterator. Note that most collections providing iterators implement Iterable and thus support seq directly. Seqs cache values, thus iterator-seq should not be used on any iterator that repeatedly returns the same mutable object.

Examples

by gstamp on 2010-09-17 . May have evaluation errors. ▶

;; Note this is not strictly necessary since keySet is a collection ;; implementing Iterable but it does show the usage. (iterator-seq (.iterator (.keySet (java.lang.System/getProperties)))) ("java.runtime.name" "sun.boot.library.path" "java.vm.version" "java.vm.vendor" "java.vendor.url" "path.separator" "java.vm.name" "file.encoding.pkg" "sun.java.launcher" "user.country" "sun.os.patch.level" "java.vm.specification.name" "user.dir" "java.runtime.version" "java.awt.graphicsenv" "java.endorsed.dirs" "os.arch" "javax.accessibility.assistive_technologies" "java.io.tmpdir" "line.separator" "java.vm.specification.vendor" "os.name" "cljr.home" "sun.jnu.encoding" "java.library.path" "java.specification.name" "java.class.version" "sun.management.compiler" "os.version" "user.home" "user.timezone" "java.awt.printerjob" "file.encoding" "java.specification.version" "include.cljr.repo.jars" "java.class.path" "user.name" "java.vm.specification.version" "java.home" "sun.arch.data.model" "user.language" "java.specification.vendor" "java.vm.info" "java.version" "java.ext.dirs" "sun.boot.class.path" "java.vendor" "file.separator" "java.vendor.url.bug" "clojure.home" "sun.io.unicode.encoding" "sun.cpu.endian" "sun.desktop" "sun.cpu.isalist")

by reborg on 2018-02-28 . May have evaluation errors. ▶

;; Java 8 streams as sequences (->> "Clojure is the best language" (.splitAsStream #"\s+") .iterator iterator-seq) ;; ("Clojure" "is" "the" "best" "language")

Note by dakrone

I've noticed that I needed to use iterator-seq when trying to map over a Java function that returns an AbstractList Iterator. It was not directly seq-able.

See also

• clojure.core/seq (5)

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