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Merge branch 'master' into 1.13-doc-updates
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‎content/community/books.adoc‎

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by Joseph Fahey, Thomas Haratyk, Scott McCaughie, Yehonathan Sharvit, Konrad Szydlo +
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Jan 29, 2020
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| image::https://images-na.ssl-images-amazon.com/images/I/71FicSOofEL._SL160.jpg[Programação Funcional: Uma introdução em Clojure,link="https://www.amazon.com/dp/B07PFFQ7NL",width="130"]
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| https://www.amazon.com/dp/B07PFFQ7NL[Programação Funcional: Uma introdução em Clojure] +
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by Gregório Melo +
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Mar 1, 2019
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| image::https://images-na.ssl-images-amazon.com/images/I/51UNlhb3nmL._SL160.jpg[Hands-On Reactive Programming with Clojure,link="https://amzn.com/B07N7525GX",width="130"]
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| https://amzn.com/B07N7525GX[Reactive Programming with Clojure] +
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by Konrad Szydlo, Leonardo Borges +

‎content/dev/contributor_agreement.adoc‎

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* Federico Brubacher
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* Frank Yin
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* Frantisek Sodomka
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* Fredrik Vaeng Røtnes
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* Gabriel Horner
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* Gary Fredericks
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* George Jahad
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* Luke VanderHart
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* Marc O'Morain
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* Mark Simpson
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* Matheus Francisco Batista Machado
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* Matt Revelle
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* Matthew Boston
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* Matthew Gilliard

‎content/dev/contributors.csv‎

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@@ -1426,6 +1426,7 @@ Collin Rogowski,qollin
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Allen Rohner,arohner
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Marco Rolappe,mrolappe
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Christian Romney,christianromney
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Fredrik Vaeng Røntes,frwdrik
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Andrew Rosa,andrewhr
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Jeff Rose,rosejn
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Sean Ross,

‎content/events/2026/clojure-real-world-data-65--982864414.adoc‎

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= Clojure real-world-data 65
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2026-07-17
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:jbake-type: event
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:jbake-edition:
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:jbake-link: https://clojureverse.org/t/clojure-real-world-data-65/14957
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:jbake-location: online
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:jbake-start: 2026-07-17
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:jbake-end: 2026-07-17
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== Clojure real-world-data 65
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On Friday, we&rsquo;ll have the usual weekly meeting of the real-world-data group. +
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As usual, we will focus on community projects, library development, and documentation, but people are invited to propose additional topics to discuss and share. +
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The main topics for the coming meetings will be documentation and additional updates. +
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Updates about the agenda will be shared in the group chat: the real-world-data channel at the Zulip chat (requires login). +
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If you wish to join the group, please reach out beforehand, and we&rsquo;ll add you to the calendar event. +
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parens1920&times;1440 98.2 KB +
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Zulip: https://clojurians.zulipchat.com/#narrow/stream/262224-events/near/610062558 +
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‎content/events/2026/los-angeles-clojure-meetup-rewrite-clj--422297397.adoc‎

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= Los Angeles Clojure Meetup: rewrite-clj
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2026-07-09
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:jbake-type: event
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:jbake-edition:
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:jbake-link: https://www.meetup.com/los-angeles-clojure-users-group/events/315564983/
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:jbake-location: online
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:jbake-start: 2026-07-09
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:jbake-end: 2026-07-09
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== Los Angeles Clojure Meetup: rewrite-clj
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This month, we will collaboratively look at rewrite-clj, a library that reads and writes Clojure and EDN in a whitespace and comment preserving way. +
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As usual, we will start off the meetup discussing recent releases and developments of note in the Clojure ecosystem. +
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The meeting will be recorded. +
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We will continue with an online virtual meeting until further notice. +
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Zulip: https://clojurians.zulipchat.com/#narrow/stream/262224-events/near/608488949 +
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‎content/news/2026/07/02/clojure-1-13-alpha1.adoc‎

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= Clojure 1.13.0-alpha1
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Alex Miller
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2026-07-02
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:jbake-type: post
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Clojure 1.13.0-alpha1 is now available! Find download and usage information on the <<xref/../../../../../releases/downloads#,Downloads>> page.
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== Checked keys
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You can now ensure that required keys are bound during map destructuring by using the new checked variants of the :keys/:syms/:strs directives - :keys!/:syms!/:strs!, which will throw if the key is not present. You can also, in all directives, specify keys after & which will not be bound, for documentation or checking purposes.
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* https://clojure.atlassian.net/browse/CLJ-2961[CLJ-2961] Checked keys
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* https://clojure.atlassian.net/browse/CLJ-2960[CLJ-2960] Specs for checked keys
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* https://clojure.atlassian.net/browse/CLJ-2949[CLJ-2949] req! - Variant of get that reports on key not found
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* https://clojure.atlassian.net/browse/CLJ-2954[CLJ-2954] let/loop/let* - disallow & as local binding
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== Other changes since Clojure 1.12.5
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* PersistentArrayMaps of only keyword keys now grow up to size 64 (previously was 8) before transitioning to PersistentHashMaps. PAM identity scans are more efficient than PHM lookups in this range, also makes more usage sites monomorphic and thus easier to optimize.
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* https://clojure.atlassian.net/browse/CLJ-2891[CLJ-2891] Remove ACC_FINAL designation from static initializer constants. This change was made as a prepatory step towards moving the Java bytecode baseline to address new verifier checks.
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* Runtime and test dependencies updated to latest versions
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== Try it out
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Update your deps.edn :deps with:
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[source]
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----
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org.clojure/clojure {:mvn/version "1.13.0-alpha1"}
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----
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Start a REPL with the Clojure CLI (any version) with:
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[source]
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----
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clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version "1.13.0-alpha1"}}}
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‎content/news/2026/07/02/clojure-1-13-alpha2.adoc‎

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= Clojure 1.13.0-alpha2
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Alex Miller
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2026-07-02
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:jbake-type: post
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Clojure 1.13.0-alpha2 is now available! Find download and usage information on the <<xref/../../../../../releases/downloads#,Downloads>> page.
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* Fixes a build problem from new Maven plugins by reverting the change
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== Try it out
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Update your deps.edn :deps with:
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[source]
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----
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org.clojure/clojure {:mvn/version "1.13.0-alpha2"}
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----
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Start a REPL with the Clojure CLI (any version) with:
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[source]
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clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version "1.13.0-alpha2"}}}
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‎content/news/2026/07/07/clojure-1-13-alpha3.adoc‎

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= Clojure 1.13.0-alpha3
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Alex Miller
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2026-07-07
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:jbake-type: post
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Clojure 1.13.0-alpha3 is now available! Find download and usage information on the <<xref/../../../../../releases/downloads#,Downloads>> page.
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== :select directive in map destructuring
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The :select directive binds a name to a subset of the map being destructured containing only the keys mentioned (anywhere) in the binding form.
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* https://clojure.atlassian.net/browse/CLJ-2964[CLJ-2964] :select directive in map destructuring
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* https://clojure.atlassian.net/browse/CLJ-2963[CLJ-2963] Update specs for :select in destructuring
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== Other changes since Clojure 1.13.0-alpha2
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* RT.map, and thus reader, tracks new PAM thresholds
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* https://clojure.atlassian.net/browse/CLJ-1789[CLJ-1789] select-keys - improve performance (transients, etc)
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* https://clojure.atlassian.net/browse/CLJ-2958[CLJ-2958] ILookup on sets
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* https://clojure.atlassian.net/browse/CLJ-2902[CLJ-2902] pprint - prints arbitary objects in unreadable form
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* https://clojure.atlassian.net/browse/CLJ-2801[CLJ-2801] TaggedLiteral - doesn't define print-dup
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* https://clojure.atlassian.net/browse/CLJ-2269[CLJ-2269] definterface - does not resolve parameter type hints
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* https://clojure.atlassian.net/browse/CLJ-2781[CLJ-2781] clojure.test/report - docstring has broken references
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* https://clojure.atlassian.net/browse/CLJ-2929[CLJ-2929] zipper - docstring typo
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* https://clojure.atlassian.net/browse/CLJ-2901[CLJ-2901] bytes, shorts, chars - docstring typos
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* https://clojure.atlassian.net/browse/CLJ-2811[CLJ-2811] scalb - docstring links to the documentation for nextDown
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* https://clojure.atlassian.net/browse/CLJ-2809[CLJ-2809] clojure.math/floor - docstring has line that should be on ceil docstring
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== Try it out
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Update your deps.edn :deps with:
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[source]
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org.clojure/clojure {:mvn/version "1.13.0-alpha3"}
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Start a REPL with the Clojure CLI (any version) with:
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[source]
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clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version "1.13.0-alpha3"}}}
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‎content/news/2026/07/14/clojure-1-13-alpha4.adoc‎

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= Clojure 1.13.0-alpha4
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Alex Miller
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2026-07-14
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:jbake-type: post
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Clojure 1.13.0-alpha4 is now available! Find download and usage information on the <<xref/../../../../../releases/downloads#,Downloads>> page.
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== Destructuring changes and additions
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Idents after `&` in :keys!/syms!/strs!/:keys/syms/strs must now be actual keys, not binding symbols. This is a change in syntax since alpha3. Note that symbol keys should be quoted as unadorned symbols are binding symbols.
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`:or` now accepts key->val mappings in addition to binding->val.
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Added a new `:defaults name` directive at top level to bind name to a map of defaults, key->val. Binding symbols in the `:or` map are transformed to the key value in the `:defaults` map. `:defaults` without `:or` is an error.
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`:select name`, introduced in alpha3, now selects deeply, through nested maps, and fills in values for missing keys from `:or`. The `:select` map contains all keys mentioned anywhere in the binding form.
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* https://clojure.atlassian.net/browse/CLJ-2964[CLJ-2964] :select directive in map destructuring
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* https://clojure.atlassian.net/browse/CLJ-2966[CLJ-2966] :defaults directive in map destructuring
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* https://clojure.atlassian.net/browse/CLJ-2967[CLJ-2967] tests for nested destructuring
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== Other changes since Clojure 1.13.0-alpha3
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* https://clojure.atlassian.net/browse/CLJ-2870[CLJ-2870] Exception phase during top-level eval is miscategorized
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== Try it out
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Update your deps.edn :deps with:
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[source]
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org.clojure/clojure {:mvn/version "1.13.0-alpha4"}
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Start a REPL with the Clojure CLI (any version) with:
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[source]
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clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version "1.13.0-alpha4"}}}
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‎content/reference/special_forms.adoc‎

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=== Associative destructuring
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Map __binding-form__s create bindings by looking up values in collections like maps, sets, vectors, strings, and arrays (the latter three have integer keys). It consists of a map of __binding-form->key__ pairs, each __binding-form__ bound to the value in the _init-expr_ at the key provided. In addition, and optionally, an `:as` key in the binding form followed by a symbol binds that symbol to the entire __init-expr__. Also optionally, an `:or` key in the binding form followed by another map may be used to supply default values for some or all of the keys if they are not found in the __init-expr__:
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Map __binding-form__s create bindings by looking up values in collections like maps, sets, vectors, strings, and arrays (the latter three have integer keys). It consists of a map of __binding-form->key__ pairs, each __binding-form__ bound to the value in the _init-expr_ at the key provided. In addition, and optionally, an `:as` key in the binding form followed by a symbol binds that symbol to the entire __init-expr__. Also optionally, an `:or` key in the binding form followed by another map may be used to supply default values for some or all of the bindings if their keys are not found in the __init-expr__:
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[source,clojure]
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