зеркало из https://github.com/github/ruby.git
52 строки
1.9 KiB
Plaintext
52 строки
1.9 KiB
Plaintext
Returns a new \String that is a copy of +string+.
|
|
|
|
With no arguments, returns the empty string with the Encoding <tt>ASCII-8BIT</tt>:
|
|
|
|
s = String.new
|
|
s # => ""
|
|
s.encoding # => #<Encoding:ASCII-8BIT>
|
|
|
|
With optional argument +string+ and no keyword arguments,
|
|
returns a copy of +string+ with the same encoding:
|
|
|
|
String.new('foo') # => "foo"
|
|
String.new('тест') # => "тест"
|
|
String.new('こんにちは') # => "こんにちは"
|
|
|
|
(Unlike \String.new,
|
|
a {string literal}[rdoc-ref:syntax/literals.rdoc@String+Literals] like <tt>''</tt> or a
|
|
{here document literal}[rdoc-ref:syntax/literals.rdoc@Here+Document+Literals]
|
|
always has {script encoding}[rdoc-ref:encodings.rdoc@Script+Encoding].)
|
|
|
|
With optional keyword argument +encoding+, returns a copy of +string+
|
|
with the specified encoding;
|
|
the +encoding+ may be an Encoding object, an encoding name,
|
|
or an encoding name alias:
|
|
|
|
String.new('foo', encoding: Encoding::US_ASCII).encoding # => #<Encoding:US-ASCII>
|
|
String.new('foo', encoding: 'US-ASCII').encoding # => #<Encoding:US-ASCII>
|
|
String.new('foo', encoding: 'ASCII').encoding # => #<Encoding:US-ASCII>
|
|
|
|
The given encoding need not be valid for the string's content,
|
|
and that validity is not checked:
|
|
|
|
s = String.new('こんにちは', encoding: 'ascii')
|
|
s.valid_encoding? # => false
|
|
|
|
But the given +encoding+ itself is checked:
|
|
|
|
String.new('foo', encoding: 'bar') # Raises ArgumentError.
|
|
|
|
With optional keyword argument +capacity+, returns a copy of +string+
|
|
(or an empty string, if +string+ is not given);
|
|
the given +capacity+ is advisory only,
|
|
and may or may not set the size of the internal buffer,
|
|
which may in turn affect performance:
|
|
|
|
String.new(capacity: 1)
|
|
String.new('foo', capacity: 4096)
|
|
|
|
The +string+, +encoding+, and +capacity+ arguments may all be used together:
|
|
|
|
String.new('hello', encoding: 'UTF-8', capacity: 25)
|