summaryrefslogtreecommitdiff
path: root/NEWS
blob: 6dab274b1afb11be69f7bc52c55e24c6259acb8e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
# -*- rdoc -*-

= NEWS for Ruby 2.6.0

This document is a list of user visible feature changes made between
releases except for bug fixes.

Note that each entry is kept so brief that no reason behind or
reference information is supplied with.  For a full list of changes
with all sufficient information, see the ChangeLog file or Redmine
(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)

== Changes since the 2.5.0 release

=== Language changes

* $SAFE is a process global state and we can set 0 again. [Feature #14250]

* refinements take place at block passing.  [Feature #14223]

* `else` without `rescue` now causes a syntax error.  [EXPERIMENTAL]

* constant names may start with a non-ASCII capital letter. [Feature #13770]

* An endless range is introduced.  You can write a range that has no end, like `(0..)`.
  The following shows typical use cases.  [Feature #12912]

    ary[1..]                            # identical to ary[1..-1]
    (1..).each {|index| ... }           # infinite loop from index 1
    ary.zip(1..) {|elem, index| ... }   # ary.each.with_index(1) { }

=== Core classes updates (outstanding ones only)

* Array

  * Aliased methods:

    * Array#filter is a new alias for Array#select [Feature #13784]
    * Array#filter! is a new alias for Array#select! [Feature #13784]

* Binding

  * New methods:

    * added Binding#source_location.  [Feature #14230]

      This method returns the source location of binding, a 2-element
      array of `__FILE__` and `__LINE__`.  Traditionally, the same
      information could be retrieved by `eval("[__FILE__, __LINE__]",
      binding)`, but we are planning to change this behavior so that
      `Kernel#eval` ignores binding's source location [Bug #4352].
      So, users should use this newly-introduced method instead of
      `Kernel#eval`.

* Dir

  * New methods:

    * added Dir#each_child and Dir#children instance methods. [Feature #13969]

* Enumerable

  * Aliased methods:

    * Enumerable#filter is a new alias for Enumerable#select [Feature #13784]

* Enumerator::Lazy

  * Aliased methods:

    * Enumerator::Lazy#filter is a new alias for Enumerator::Lazy#select [Feature #13784]

* Exception

  * Exception#full_message takes :highlight and :order options [Bug #14324]

* Hash

  * Aliased methods:

    * Hash#filter is a new alias for Hash#select [Feature #13784]
    * Hash#filter! is a new alias for Hash#select! [Feature #13784]

* Kernel

  * Kernel#then is a new alias for Kernel#yield_self [Feature #14594]

  * Kernel.#Complex takes :exception option to specify the way of error handling  [Feature #12732]

  * Kernel.#Float takes :exception option to specify the way of error handling  [Feature #12732]

  * Kernel.#Integer takes :exception option to specify the way of error handling  [Feature #12732]

  * Kernel.#Rational takes :exception option to specify the way of error handling  [Feature #12732]

  * Kernel.#system takes :exception option to raise an exception on
    failure. [Feature #14386]

* KeyError

  * KeyError#initialize accepts :receiver and :key options to set receiver and key in Ruby code. [Feature #14313]

* NameError

  * NameError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]

* NoMethodError

  * NoMethodError#initialize accepts :receiver option to set receiver in Ruby code. [Feature #14313]

* Proc

  * Proc#call doesn't change $SAFE any more. [Feature #14250]

* Random

  * New methods:

    * added Random.bytes. [Feature #4938]

* Range

  * Range#=== now uses #cover? instead of #include? method. [Feature #14575]

* RubyVM::AST

  * RubyVM::AST.parse parses a given string and returns AST nodes. [experimental]
  * RubyVM::AST.parse_file parses a given file and returns AST nodes. [experimental]

* String

  * String#split yields each substring to the block if given. [Feature #4780]

* TracePoint

  * New methods:

    * TracePoint#parameters [Feature #14694]

=== Stdlib updates (outstanding ones only)

* ERB

  * Add :trim_mode and :eoutvar keyword arguments to ERB.new. Now non-keyword arguments other than first one
    are softly deprecated and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]

  * erb command's -S option is deprecated, which will be removed in the next version.

* FileUtils

  * New method:

    * FileUtils#cp_lr [Feature #4189]

* Matrix

  * New method:

    * Matrix#antisymmetric?

* Net

  * New method:

    * Add write_timeout keyword argument to Net::BufferedIO.new. [Feature #13396]

    * Add Net::BufferedIO#write_timeout, Net::BufferedIO#write_timeout=,
      Net::HTTP#write_timeout, and Net::HTTP#write_timeout=. [Feature #13396]

  * New constant:

    * Add Net::HTTPClientException to deprecate Net::HTTPServerException,
      whose name is misleading. [Bug #14688]

* REXML

  * Improved some XPath implementations:

    * concat() function: Stringify all arguments before concatenating

    * string() function: Support context node

    * string() function: Support processing instruction node

    * Support "*:#{ELEMENT_NAME}" syntax in XPath 2.0

  * Fixed some XPath implementations:

    * "//#{ELEMENT_NAME}[#{POSITION}]" case

    * string() function: Fix function(document) returns nodes that are
      out of root elements.

    * "/ #{ELEMENT_NAME} " case

    * "/ #{ELEMENT_NAME} [ #{PREDICATE} ]" case

    * "/ #{AXIS}:: #{ELEMENT_NAME} " case

    * "#{N}-#{M}" case: One ore more white spaces were required before "-"

    * "/child::node()" case

    * "#{FUNCTION}()/#{PATH}" case

    * "@#{ATTRIBUTE}/parent::" case

    * "name(#{NODE_SET})" case

* RSS

  * RSS::Parser.parse: Accept options as Hash. :validate,
    :ignore_unknown_element, :parser_class options are available.

* Set

  * Aliased methods:

    * Set#filter! is a new alias for Set#select! [Feature #13784]

* URI

  * Add URI::File to handle file URI scheme [Feature #14035]

=== Compatibility issues (excluding feature bug fixes)

* File

  * File.read, File.binread, File.write, File.binwrite, File.foreach,
    and File.readlines do not invoke external commands even if the path
    starts with the pipe character |.  [Feature #14245]

* Dir

  * Dir.glob with '\0'-separated pattern list will be deprecated, and
    is now warned.  [Feature #14643]

=== Stdlib compatibility issues (excluding feature bug fixes)

=== C API updates

=== Supported platform changes

=== Implementation improvements

* Speedup `Proc#call` because we don't need to care about `$SAFE` any more. [Feature #14318]
  With `lc_fizzbuzz` benchmark which uses so many `Proc#call` we can measure
  x1.4 improvements [Bug #10212].

* Speedup `block.call` where `block` is passed block parameter. [Feature #14330]
  Ruby 2.5 improves block passing performance. [Feature #14045]
  Additionally, Ruby 2.6 improves the performance of passed block calling.

* Introduce an initial implementation of JIT (Just-in-time) compiler. [Feature #14235] [experimental]
  * `--jit` option is added to enable JIT. `--jit-verbose=1` is good for inspection. See `ruby --help` for others.
  * This JIT relies on C compiler used to build Ruby, on runtime. Only gcc and clang are supported for the JIT
    for now, and MinGW support has some issues.
  * As of 2.6.0-preview1, we're just preparing infrastructure for JIT and very few optimizations are implemented.
    So it's not ready for benchmarking Ruby's JIT performance yet. It's known that current JIT enablement makes
    Rails application slower for now.

* VM generator script renewal; makes the generated VM more optimized. [GH-1779]

* Thread cache enabled for pthreads platforms
  (for `Thread.new` and `Thread.start`) [Feature #14757]

=== Miscellaneous changes

* On macOS, shared libraries no longer include a full version number of ruby in their names.
  This eliminates the burden of each teeny upgrade on the platform that users need to rebuild every extension library.

  * Before:
    * libruby.2.6.0.dylib
    * libruby.2.6.dylib -> libruby.2.6.0.dylib
    * libruby.dylib -> libruby.2.6.0.dylib

  * After:
    * libruby.2.6.dylib
    * libruby.dylib -> libruby.2.6.dylib