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English type: delimited block -
json = <<END
{
"name": "Alice",
"age": 30,
"children": [{ "name": "Bob", "age": 2 }]
}
END
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English Portuguese (Brazil) Actions
observer
 
timeout
 
tracer
 
uri
 
yaml
 
`Proc.new` and `proc` with no block in a method called with a block is warned now.
 
lambda with no block in a method called with a block raises an exception.
 
Update Unicode version and Emoji version from 11.0.0 to 12.0.0.
 
Update Unicode version to 12.1.0, adding support for U+32FF SQUARE ERA NAME REIWA.
 
`Date.jisx0301`, `Date#jisx0301`, and `Date.parse` support the new Japanese era.
 
Require compilers to support C99.
 
Detailed changes
 
Pattern Matching [Experimental]
 
Pattern matching, a widely used feature in functional programming languages, is introduced as an experimental feature. It can traverse a given object and assign it's value if it matches a pattern.
 
require "json"
 
json = <<END
{
"name": "Alice",
"age": 30,
"children": [{ "name": "Bob", "age": 2 }]
}
END
json = <<END
{
"name": "Alice",
"age": 30,
"children": [{ "name": "Bob", "age": 2 }]
}
END
case JSON.parse(json, symbolize_names: true)
in {name: "Alice", children: [{name: "Bob", age: age}]}
p age #=> 2
end
case JSON.parse(json, symbolize_names: true)
in {name: "Alice", children: [{name: "Bob", age: age}]}
p age #=> 2
end
REPL improvement
 
`irb`, the bundled interactive environment (REPL; Read-Eval-Print-Loop), now supports multi-line editing. It is powered by `reline`, a `readline` -compatible library implemented in pure Ruby. It also provides rdoc integration. In `irb` you can display the reference for a given class, module, or method.
 
Compaction GC
 
This release introduces Compaction GC which can defragment a fragmented memory space.
 
Some multi-threaded Ruby programs may cause memory fragmentation, leading to high memory usage and degraded speed.
 
The `GC.compact` method is introduced for compacting the heap. This function compacts live objects in the heap so that fewer pages may be used, and the heap may be more CoW (copy-on-write) friendly.
 
Separation of positional and keyword arguments
 
Automatic conversion of keyword arguments and positional arguments is deprecated, and conversion will be removed in Ruby 3.
 
Changes
Alterações
When a method call passes a Hash at the last argument, and when it passes no keywords, and when the called method accepts keywords, a warning is emitted. To continue treating the hash as keywords, add a double splat operator to avoid the warning and ensure correct behavior in Ruby 3.
 
def foo(key: 42); end; foo({key: 42}) # warned
def foo(**kw); end; foo({key: 42}) # warned
def foo(key: 42); end; foo(**{key: 42}) # OK
def foo(**kw); end; foo(**{key: 42}) # OK
def foo(key: 42); end; foo({key: 42}) # warned
def foo(**kw); end; foo({key: 42}) # warned
def foo(key: 42); end; foo(**{key: 42}) # OK
def foo(**kw); end; foo(**{key: 42}) # OK
When a method call passes keywords to a method that accepts keywords, but it does not pass enough required positional arguments, the keywords are treated as a final required positional argument, and a warning is emitted. Pass the argument as a hash instead of keywords to avoid the warning and ensure correct behavior in Ruby 3.
 
def foo(h, **kw); end; foo(key: 42) # warned
def foo(h, key: 42); end; foo(key: 42) # warned
def foo(h, **kw); end; foo({key: 42}) # OK
def foo(h, key: 42); end; foo({key: 42}) # OK
def foo(h, **kw); end; foo(key: 42) # warned
def foo(h, key: 42); end; foo(key: 42) # warned
def foo(h, **kw); end; foo({key: 42}) # OK
def foo(h, key: 42); end; foo({key: 42}) # OK
When a method accepts specific keywords but not a keyword splat, and a hash or keywords splat is passed to the method that includes both Symbol and non-Symbol keys, the hash will continue to be split, and a warning will be emitted. You will need to update the calling code to pass separate hashes to ensure correct behavior in Ruby 3.
 

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User avatar farribeiro

Marked for edit
json = <<END
{
"name": "Alice",
"age": 30,
"children": [{ "name": "Bob", "age": 2 }]
}
END
json = <<END
{
"name": "Alice",
"age": 30,
"children": [{ "name": "Bob", "age": 2 }]
}
END
a year ago
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4506698 String information

Source string description
type: delimited block -
Flags
no-wrap
Source string location
pages/developers/Development_Ruby.adoc:96
String age
4 years ago
Last updated
a year ago
Source string age
4 years ago
Translation file
po/pt_BR/f32/pages/developers/Development_Ruby.po, string 65