Results for: "pstore"

Assigns the underlying string as other_string, and sets position to zero; returns other_string:

StringIO.open('foo') do |strio|
  p strio.string
  strio.string = 'bar'
  p strio.string
end

Output:

"foo"
"bar"

Related: StringIO#string (returns the underlying string).

Sets the current position and line number to zero; see Position and Line Number.

See IO#readlines.

See IO#read.

See IO#pread.

Sets both [byte position] and [character position] to zero, and clears [match values]; returns self:

scanner = StringScanner.new('foobarbaz')
scanner.exist?(/bar/)          # => 6
scanner.reset                  # => #<StringScanner 0/9 @ "fooba...">
put_situation(scanner)
# Situation:
#   pos:       0
#   charpos:   0
#   rest:      "foobarbaz"
#   rest_size: 9
# => nil
match_values_cleared?(scanner) # => true

Returns the [stored string]:

scanner = StringScanner.new('foobar')
scanner.string # => "foobar"
scanner.concat('baz')
scanner.string # => "foobarbaz"

Replaces the [stored string] with the given other_string:

• Sets both [positions] to zero.

• Clears [match values].

• Returns other_string.

scanner = StringScanner.new('foobar')
scanner.scan(/foo/)
put_situation(scanner)
# Situation:
#   pos:       3
#   charpos:   3
#   rest:      "bar"
#   rest_size: 3
match_values_cleared?(scanner) # => false

scanner.string = 'baz'         # => "baz"
put_situation(scanner)
# Situation:
#   pos:       0
#   charpos:   0
#   rest:      "baz"
#   rest_size: 3
match_values_cleared?(scanner) # => true

Attempts to [match] the given pattern anywhere (at any [position]) n the [target substring]; does not modify the [positions].

If the match succeeds:

• Returns a byte offset: the distance in bytes between the current [position] and the end of the matched substring.

• Sets all [match values].

scanner = StringScanner.new('foobarbazbatbam')
scanner.pos = 6
scanner.exist?(/bat/) # => 6
put_match_values(scanner)
# Basic match values:
#   matched?:       true
#   matched_size:   3
#   pre_match:      "foobarbaz"
#   matched  :      "bat"
#   post_match:     "bam"
# Captured match values:
#   size:           1
#   captures:       []
#   named_captures: {}
#   values_at:      ["bat", nil]
#   []:
#     [0]:          "bat"
#     [1]:          nil
put_situation(scanner)
# Situation:
#   pos:       6
#   charpos:   6
#   rest:      "bazbatbam"
#   rest_size: 9

If the match fails:

• Returns nil.

• Clears all [match values].

scanner.exist?(/nope/)         # => nil
match_values_cleared?(scanner) # => true

Returns the array of [captured match values] at indexes (1..) if the most recent match attempt succeeded, or nil otherwise:

scanner = StringScanner.new('Fri Dec 12 1975 14:39')
scanner.captures         # => nil

scanner.exist?(/(?<wday>\w+) (?<month>\w+) (?<day>\d+) /)
scanner.captures         # => ["Fri", "Dec", "12"]
scanner.values_at(*0..4) # => ["Fri Dec 12 ", "Fri", "Dec", "12", nil]

scanner.exist?(/Fri/)
scanner.captures         # => []

scanner.scan(/nope/)
scanner.captures         # => nil

Rebuilds the hash table by recomputing the hash index for each key; returns self.

The hash table becomes invalid if the hash value of a key has changed after the entry was created. See Modifying an Active Hash Key.

For an instance of Hash, returns self.

For a subclass of Hash, returns a new Hash containing the content of self.

When a block is given, returns a new Hash object whose content is based on the block; the block should return a 2-element Array object specifying the key-value pair to be included in the returned Array:

h = {foo: 0, bar: 1, baz: 2}
h1 = h.to_h {|key, value| [value, key] }
h1 # => {0=>:foo, 1=>:bar, 2=>:baz}

Returns a new Array of 2-element Array objects; each nested Array contains a key-value pair from self:

h = {foo: 0, bar: 1, baz: 2}
h.to_a # => [[:foo, 0], [:bar, 1], [:baz, 2]]

Returns a new Hash object whose entries are all those from self for which the block returns false or nil:

h = {foo: 0, bar: 1, baz: 2}
h1 = h.reject {|key, value| key.start_with?('b') }
h1 # => {foo: 0}

Returns a new Enumerator if no block given:

h = {foo: 0, bar: 1, baz: 2}
e = h.reject # => #<Enumerator: {foo: 0, bar: 1, baz: 2}:reject>
h1 = e.each {|key, value| key.start_with?('b') }
h1 # => {foo: 0}

Returns self, whose remaining entries are those for which the block returns false or nil:

h = {foo: 0, bar: 1, baz: 2}
h.reject! {|key, value| value < 2 } # => {baz: 2}

Returns nil if no entries are removed.

Returns a new Enumerator if no block given:

h = {foo: 0, bar: 1, baz: 2}
e = h.reject! # => #<Enumerator: {foo: 0, bar: 1, baz: 2}:reject!>
e.each {|key, value| key.start_with?('b') } # => {foo: 0}

Replaces the entire contents of self with the contents of other_hash; returns self:

h = {foo: 0, bar: 1, baz: 2}
h.replace({bat: 3, bam: 4}) # => {bat: 3, bam: 4}

Returns a new String containing the hash entries:

h = {foo: 0, bar: 1, baz: 2}
h.inspect # => "{foo: 0, bar: 1, baz: 2}"

Yields each environment variable name and its value as a 2-element Array. Returns a Hash whose items are determined by the block. When the block returns a truthy value, the name/value pair is added to the return Hash; otherwise the pair is ignored:

ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
ENV.reject { |name, value| name.start_with?('b') } # => {"foo"=>"0"}

Returns an Enumerator if no block given:

e = ENV.reject
e.each { |name, value| name.start_with?('b') } # => {"foo"=>"0"}

Similar to ENV.delete_if, but returns nil if no changes were made.

Yields each environment variable name and its value as a 2-element Array, deleting each environment variable for which the block returns a truthy value, and returning ENV (if any deletions) or nil (if not):

ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
ENV.reject! { |name, value| name.start_with?('b') } # => ENV
ENV # => {"foo"=>"0"}
ENV.reject! { |name, value| name.start_with?('b') } # => nil

Returns an Enumerator if no block given:

ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
e = ENV.reject! # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:reject!>
e.each { |name, value| name.start_with?('b') } # => ENV
ENV # => {"foo"=>"0"}
e.each { |name, value| name.start_with?('b') } # => nil

Raises an exception:

ENV.freeze # Raises TypeError (cannot freeze ENV)

Replaces the entire content of the environment variables with the name/value pairs in the given hash; returns ENV.

Replaces the content of ENV with the given pairs:

ENV.replace('foo' => '0', 'bar' => '1') # => ENV
ENV.to_hash # => {"bar"=>"1", "foo"=>"0"}

Raises an exception if a name or value is invalid (see Invalid Names and Values):

ENV.replace('foo' => '0', :bar => '1') # Raises TypeError (no implicit conversion of Symbol into String)
ENV.replace('foo' => '0', 'bar' => 1) # Raises TypeError (no implicit conversion of Integer into String)
ENV.to_hash # => {"bar"=>"1", "foo"=>"0"}

(Provided for compatibility with Hash.)

Does not modify ENV; returns nil.

Returns the contents of ENV as an Array of 2-element Arrays, each of which is a name/value pair:

ENV.replace('foo' => '0', 'bar' => '1')
ENV.to_a # => [["bar", "1"], ["foo", "0"]]

Returns String ‘ENV’:

ENV.to_s # => "ENV"

With no block, returns a Hash containing all name/value pairs from ENV:

ENV.replace('foo' => '0', 'bar' => '1')
ENV.to_h # => {"bar"=>"1", "foo"=>"0"}

With a block, returns a Hash whose items are determined by the block. Each name/value pair in ENV is yielded to the block. The block must return a 2-element Array (name/value pair) that is added to the return Hash as a key and value:

ENV.to_h { |name, value| [name.to_sym, value.to_i] } # => {bar: 1, foo: 0}

Raises an exception if the block does not return an Array:

ENV.to_h { |name, value| name } # Raises TypeError (wrong element type String (expected array))

Raises an exception if the block returns an Array of the wrong size:

ENV.to_h { |name, value| [name] } # Raises ArgumentError (element has wrong array length (expected 2, was 1))