Great changes! I have a question about #5.
> 5) New "some" operations > Many conditional functions rely on logical truth (where "falsey" > values are nil or false). Sometimes it is useful to have functions > that rely on "not nilness" instead. These functions have been added to > support these cases [CLJ-1343]: > * some? - same as (not (nil? x)) > * if-some - like if-let, but checks (not (nil? test)) instead of test > * when-some - like when-let, but checks (not (nil? test)) instead of test It seems inconsistent to have "some" mean two very different things within the same namespace, especially since the prior uses of "some" (`some`, `some-fn`, etc.) are more in keeping with its primary definition of having to do with amount (and operate on seqs or variadic arguments) while the new functions have to do with existence (and operate on any single value). Why not call these new functions `not-nil?`, `if-not-nil`, and `when-not-nil`? Or, if "not-nil" is too unwieldy then what about "exists" (`exists?`, `if-exists`, `when-exists`)? Are these names up for discussion? Cheers, Dom On Fri, Feb 14, 2014 at 11:04 AM, Alex Miller <a...@puredanger.com> wrote: > Clojure 1.6.0-beta1 is now available. > > Try it via > - Download: > http://central.maven.org/maven2/org/clojure/clojure/1.6.0-beta1 > - Leiningen: [org.clojure/clojure "1.6.0-beta1"] > > Highlights below or see the full change log here: > https://github.com/clojure/clojure/blob/master/changes.md > > We expect Clojure 1.6.0-beta1 to be close to a release candidate; no other > big changes are planned. Please give us your feedback and final issues if > you find them so we can do the final release! > > Clojure 1.6.0-beta1 has the following changes from 1.5.1: > > 1) Clojure now builds with Java SE 1.6 and emits bytecode requiring Java > SE 1.6 instead of Java SE 1.5. [CLJ-1268] > > 2) The following features are no longer marked "Alpha" in Clojure: > > * Watches - add-watch, remove-watch > * Transients - transient, persistent!, conj!, assoc!, dissoc!, pop!, disj! > * Exception data - ex-info, ex-data > * Promises - promise, deliver > * Records - defrecord > * Types - deftype > * Pretty-print tables - print-table > > 3) The clojure.java.api package provides a minimal interface to bootstrap > Clojure access from other JVM languages. Example: > > IFn map = Clojure.var("clojure.core", "map"); > IFn inc = Clojure.var("clojure.core", "inc"); > map.invoke(inc, Clojure.read("[1 2 3]")); > > 4) Map destructuring extended to support namespaced keys. [CLJ-1318] > > In the past, map destructuring with :keys and :syms would not work > with maps containing namespaced keys or symbols. The :keys and :syms > forms have been updated to allow them to match namespaced keys and > bind to a local variable based on the name. > > Examples: > > (let [m {:x/a 1, :y/b 2} > {:keys [x/a y/b]} m] > (+ a b)) > > (let [m {'x/a 1, 'y/b 2} > {:syms [x/a y/b]} m] > (+ a b)) > > Additionally, the :keys form can now take keywords instead of symbols. > This provides support specifically for auto-resolved keywords: > > (let [m {::x 1} > {:keys [::x]} m] > x) > > 5) New "some" operations > > Many conditional functions rely on logical truth (where "falsey" > values are nil or false). Sometimes it is useful to have functions > that rely on "not nilness" instead. These functions have been added to > support these cases [CLJ-1343]: > > * some? - same as (not (nil? x)) > * if-some - like if-let, but checks (not (nil? test)) instead of test > * when-some - like when-let, but checks (not (nil? test)) instead of test > > 6) Hashing overhaul > > The Clojure hash algorithms have changed for many primitives and > collections. > Read the changelog and http://clojure.org/data_structures#hash for more > detail > and if you are building external collections. > > In general, this change creates better hash codes (better bit dispersion, > fewer > collisions) to improve performance of hashed collections (maps and sets). > *NOTE:* One side effect may be that code currently relying on the > arbitrary order > of hashed elements in a collection (tests for example) may need to be > fixed. > > 7) Other new things > > * unsigned-bit-shift-right - Java's >>> > * clojure.test/test-vars - run a set of tests with fixtures > > 8) Printing enhancements > > * [CLJ-908](http://dev.clojure.org/jira/browse/CLJ-908) > Print metadata for functions when *print-meta* is true and remove errant > space at beginning. > * [CLJ-937](http://dev.clojure.org/jira/browse/CLJ-937) > pprint cl-format now supports E, F, and G formats for ratios. > > 9) Error messages > > * [CLJ-1248](http://dev.clojure.org/jira/browse/CLJ-1248) > Print type information in reflection messages to help diagnose problem. > * [CLJ-1099](http://dev.clojure.org/jira/browse/CLJ-1099) > If non-seq passed where seq is needed, error message now is an > ExceptionInfo with the instance value, retrievable via ex-data. > * [CLJ-1083](http://dev.clojure.org/jira/browse/CLJ-1083) > Fix error message reporting for "munged" function names (like a->b). > * [CLJ-1056](http://dev.clojure.org/jira/browse/CLJ-1056) > Handle more cases and improve error message for errors in defprotocol > definitions. > * [CLJ-1102](http://dev.clojure.org/jira/browse/CLJ-1102) > Better handling of exceptions with empty stack traces. > * [CLJ-939](http://dev.clojure.org/jira/browse/CLJ-939) > Exceptions thrown in the top level ns form are reported without file or > line number. > > 10) Documentation strings > > * [CLJ-1164](http://dev.clojure.org/jira/browse/CLJ-1164) > Fix typos in clojure.instant/validated and other internal instant > functions. > * [CLJ-1143](http://dev.clojure.org/jira/browse/CLJ-1143) > Correct doc string for ns macro. > * [CLJ-196](http://dev.clojure.org/jira/browse/CLJ-196) > Clarify value of *file* is undefined in the REPL. > * [CLJ-1228](http://dev.clojure.org/jira/browse/CLJ-1228) > Fix a number of spelling errors in namespace and doc strings. > * [CLJ-835](http://dev.clojure.org/jira/browse/CLJ-835) > Update defmulti doc to clarify expectations for hierarchy argument. > * [CLJ-1304](http://dev.clojure.org/jira/browse/CLJ-1304) > Fix minor typos in documentation and comments > * [CLJ-1302](http://dev.clojure.org/jira/browse/CLJ-1302) > Mention that keys and vals order are consistent with seq order > > 11) Performance > > * [CLJ-858](http://dev.clojure.org/jira/browse/CLJ-858) > Improve speed of STM by removing System.currentTimeMillis. > * [CLJ-669](http://dev.clojure.org/jira/browse/CLJ-669) > clojure.java.io/do-copy: use java.nio for Files > * [commit]( > https://github.com/clojure/clojure/commit/0b73494c3c855e54b1da591eeb687f24f608f346 > ) > Reduce overhead of protocol callsites by removing unneeded generated > cache fields. > > 12) Other enhancements > > * [CLJ-908](http://dev.clojure.org/jira/browse/CLJ-908) > Make *default-data-reader-fn* set!-able in REPL, similar to > *data-readers*. > * [CLJ-783](http://dev.clojure.org/jira/browse/CLJ-783) > Make clojure.inspector/inspect-tree work on sets. > * [CLJ-896](http://dev.clojure.org/jira/browse/CLJ-896) > Make browse-url aware of xdg-open. > * [CLJ-1160](http://dev.clojure.org/jira/browse/CLJ-1160) > Fix clojure.core.reducers/mapcat does not stop on reduced? values. > * [CLJ-1121](http://dev.clojure.org/jira/browse/CLJ-1121) > -> and ->> have been rewritten to work with a broader set of macros. > * [CLJ-1105](http://dev.clojure.org/jira/browse/CLJ-1105) > clojure.walk now supports records. > * [CLJ-949](http://dev.clojure.org/jira/browse/CLJ-949) > Removed all unnecessary cases of sneakyThrow. > * [CLJ-1238](http://dev.clojure.org/jira/browse/CLJ-1238) > Allow EdnReader to read foo// (matches LispReader behavior). > * [CLJ-1264](http://dev.clojure.org/jira/browse/CLJ-1264) > Remove uses of _ as a var in the Java code (causes warning in Java 8). > * [CLJ-394](http://dev.clojure.org/jira/browse/CLJ-394) > Add record? predicate. > * [CLJ-1200](http://dev.clojure.org/jira/browse/CLJ-1200) > ArraySeq dead code cleanup, ArraySeq_short support added. > * [CLJ-1331](http://dev.clojure.org/jira/browse/CLJ-1331) > Primitive vectors should implement hasheq and use new hash algorithm > > 13) Bug Fixes > > * [CLJ-1018](http://dev.clojure.org/jira/browse/CLJ-1018) > Make range consistently return () with a step of 0. > * [CLJ-863](http://dev.clojure.org/jira/browse/CLJ-863) > Make interleave return () on 0 args and identity on 1 args. > * [CLJ-1072](http://dev.clojure.org/jira/browse/CLJ-1072) > Update internal usages of the old metadata reader syntax to new syntax. > * [CLJ-1193](http://dev.clojure.org/jira/browse/CLJ-1193) > Make bigint and biginteger functions work on double values outside long > range. > * [CLJ-1154](http://dev.clojure.org/jira/browse/CLJ-1154) > Make Compile.java flush but not close stdout so errors can be reported. > * [CLJ-1161](http://dev.clojure.org/jira/browse/CLJ-1161) > Remove bad version.properties from sources jar. > * [CLJ-1175](http://dev.clojure.org/jira/browse/CLJ-1175) > Fix invalid behavior of Delay/deref if an exception is thrown - > exception will > now be rethrown on subsequent calls and not enter a corrupted state. > * [CLJ-1171](http://dev.clojure.org/jira/browse/CLJ-1171) > Fix several issues with instance? to make it consistent when used with > apply. > * [CLJ-1202](http://dev.clojure.org/jira/browse/CLJ-1202) > Protocol fns with dashes may get incorrectly compiled into field > accesses. > * [CLJ-850](http://dev.clojure.org/jira/browse/CLJ-850) > Add check to emit invokePrim with return type of double or long if > type-hinted. > * [CLJ-1177](http://dev.clojure.org/jira/browse/CLJ-1177) > clojure.java.io URL to File coercion corrupts path containing UTF-8 > characters. > * [CLJ-1234](http://dev.clojure.org/jira/browse/CLJ-1234) > Accept whitespace in Record and Type reader forms (similar to data > literals). > * [CLJ-1233](http://dev.clojure.org/jira/browse/CLJ-1233) > Allow ** as a valid symbol name without triggering dynamic warnings. > * [CLJ-1246](http://dev.clojure.org/jira/browse/CLJ-1246) > Add support to clojure.reflect for classes with annotations. > * [CLJ-1184](http://dev.clojure.org/jira/browse/CLJ-1184) > Evaling #{do ...} or [do ...] is treated as do special form. > * [CLJ-1090](http://dev.clojure.org/jira/browse/CLJ-1090) > Indirect function calls through Var instances fail to clear locals. > * [CLJ-1076](http://dev.clojure.org/jira/browse/CLJ-1076) > pprint tests fail on Windows, expecting \n. > * [CLJ-766](http://dev.clojure.org/jira/browse/CLJ-766) > Make into-array work consistently with short-array and byte-array on > bigger types. > * [CLJ-1285](http://dev.clojure.org/jira/browse/CLJ-1285) > Data structure invariants are violated after persistent operations when > collision node created by transients. > * [CLJ-1222](http://dev.clojure.org/jira/browse/CLJ-1222) > Multiplication overflow issues around Long/MIN_VALUE > * [CLJ-1118](http://dev.clojure.org/jira/browse/CLJ-1118) > Inconsistent numeric comparison semantics between BigDecimals and other > numerics > * [CLJ-1125](http://dev.clojure.org/jira/browse/CLJ-1125) > Clojure can leak memory in a servlet container when using dynamic > bindings or STM transactions. > * [CLJ-1082](http://dev.clojure.org/jira/browse/CLJ-1082) > Subvecs of primitve vectors cannot be reduced > * [CLJ-1301](http://dev.clojure.org/jira/browse/CLJ-1301) > Case expressions use a mixture of hashCode and hasheq, potentially > leading to missed case matches when these differ. > * [CLJ-983](http://dev.clojure.org/jira/browse/CLJ-983) > proxy-super does not restore original binding if call throws exception > * [CLJ-1176](http://dev.clojure.org/jira/browse/CLJ-1176) > clojure.repl/source errors when *read-eval* bound to :unknown > * [CLJ-935](http://dev.clojure.org/jira/browse/CLJ-935) > clojure.string/trim uses different definition of whitespace than > triml and trimr > * [CLJ-935](http://dev.clojure.org/jira/browse/CLJ-935) > StackOverflowError on exception in reducef for PersistentHashMap > fold > * [CLJ-1328](http://dev.clojure.org/jira/browse/CLJ-1328) > Fix some tests in the Clojure test suite to make their names unique > and independent of hashing order > * [CLJ-1328](http://dev.clojure.org/jira/browse/CLJ-1328) > Empty primitive vectors throw NPE on .equals with non-vector > sequential types > > Happy Valentine's Day! > > Alex Miller > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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