Results for: "to_proc"

Returns the result of interpreting enum as a list of [key, value] pairs.

%i[hello world].each_with_index.to_h
  # => {:hello => 0, :world => 1}

Returns self.

Creates a new Enumerator which will enumerate by calling method on obj, passing args if any.

If a block is given, it will be used to calculate the size of the enumerator without the need to iterate it (see Enumerator#size).

Examples

str = "xyz"

enum = str.enum_for(:each_byte)
enum.each { |b| puts b }
# => 120
# => 121
# => 122

# protect an array from being modified by some_method
a = [1, 2, 3]
some_method(a.to_enum)

It is typical to call to_enum when defining methods for a generic Enumerable, in case no block is passed.

Here is such an example, with parameter passing and a sizing block:

module Enumerable
  # a generic method to repeat the values of any enumerable
  def repeat(n)
    raise ArgumentError, "#{n} is negative!" if n < 0
    unless block_given?
      return to_enum(__method__, n) do # __method__ is :repeat here
        sz = size     # Call size and multiply by n...
        sz * n if sz  # but return nil if size itself is nil
      end
    end
    each do |*val|
      n.times { yield *val }
    end
  end
end

%i[hello world].repeat(2) { |w| puts w }
  # => Prints 'hello', 'hello', 'world', 'world'
enum = (1..14).repeat(3)
  # => returns an Enumerator when called without a block
enum.first(4) # => [1, 1, 1, 2]
enum.size # => 42

Casts an Integer as an OpenSSL::BN

See ‘man bn` for more info.

As int is already an Integer, all these methods simply return the receiver.

Synonyms is to_int

Stores class name (Complex) along with real value r and imaginary value i as JSON string

Invokes the child class’s to_i method to convert num to an integer.

1.0.class => Float
1.0.to_int.class => Integer
1.0.to_i.class => Integer

Returns self.

If called on a subclass of String, converts the receiver to a String object.

Returns the Symbol corresponding to str, creating the symbol if it did not previously exist. See Symbol#id2name.

"Koala".intern         #=> :Koala
s = 'cat'.to_sym       #=> :cat
s == :cat              #=> true
s = '@cat'.to_sym      #=> :@cat
s == :@cat             #=> true

This can also be used to create symbols that cannot be represented using the :xxx notation.

'cat and dog'.to_sym   #=> :"cat and dog"

Returns the float truncated to an Integer.

Synonyms are to_i and to_int

Returns the path parameter passed to dir’s constructor.

d = Dir.new("..")
d.path   #=> ".."

Returns the pathname used to create file as a string. Does not normalize the name.

File.new("testfile").path               #=> "testfile"
File.new("/tmp/../tmp/xxx", "w").path   #=> "/tmp/../tmp/xxx"

Stores class name (Exception) with message m and backtrace array b as JSON string

Returns the value as an Integer.

If the BigDecimal is infinity or NaN, raises FloatDomainError.

Converts a BigDecimal to a String of the form “nnnnnn.mmm”. This method is deprecated; use BigDecimal#to_s(“F”) instead.

require 'bigdecimal/util'

d = BigDecimal.new("3.14")
d.to_digits                  # => "3.14"

return the JSON value

Stores class name (Rational) along with numerator value n and denominator value d as JSON string

Returns a Time object which denotes self.

Returns self.

Returns a DateTime object which denotes self.

Stores class name (Date) with Julian year y, month m, day d and Day of Calendar Reform sg as JSON string

Returns a Time object which denotes self.

Returns a Date object which denotes self.

Returns self.