Likely discussed in #clojure IRC and I checked with some Clojure/core folks for feedback.
David On Fri, Feb 14, 2014 at 10:54 PM, Joel Holdbrooks <cjholdbro...@gmail.com>wrote: > Right. I won't disagree with the function being critical or with avoiding > breakage. I'm just mostly whining here cause I missed the boat. :-) > > Did that discussion take place here or in Jira? I'd definitely like to be > able to chime in with thoughts/suggestions in the future WRT this topic. > > On Friday, February 14, 2014 7:46:23 PM UTC-8, David Nolen wrote: > >> exists? is a pretty critical feature for application writers and I asked >> several users about it before committing to a name. Unless Clojure decides >> to adopt it, little incentive to cause unnecessary breakage. >> >> David >> >> >> On Fri, Feb 14, 2014 at 10:28 PM, Joel Holdbrooks <cjhold...@gmail.com>wrote: >> >>> Slightly off topic, but I wish I would have been apart of that >>> discussion because there's another example of function that, at face value, >>> doesn't clearly express it's nature. In tandem with my comment below, there >>> should really be a little more consideration for the names of these >>> functions. I would agree that short function names should be favored but >>> not at the expense of communication. >>> >>> There's probably nothing that can be done for this now, but while >>> feature detection is common *in a program*, it is uncommon *throughout >>> a program*. I would thus argue, that a name with a higher degree of >>> precision, and perhaps more characters, would have been a better choice. >>> >>> On Friday, February 14, 2014 2:36:51 PM UTC-8, David Nolen wrote: >>> >>>> exists? doesn't seem right to me. Also we do use `exists?` currently in >>>> ClojureScript since feature detection is so common in client side code and >>>> the name seems more appropriate to me in that context. That could of course >>>> change but we would need to coordinate. >>>> >>>> David >>>> >>>> >>>> On Fri, Feb 14, 2014 at 3:27 PM, Dom Kiva-Meyer <li...@domkm.com>wrote: >>>> >>>>> 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 <al...@puredanger.com>wrote: >>>>> >>>>>> Clojure 1.6.0-beta1 is now available. >>>>>> >>>>>> Try it via >>>>>> - Download: http://central.maven.org/maven2/org/clojure/clojur >>>>>> e/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/0b73494c3 >>>>>> c855e54b1da591eeb687f24f608f346) >>>>>> 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 clo...@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+u...@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 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