Results for: "to_proc"

MRI specific feature

Return all reachable objects from root.

Prefix and suffix the program filename the same as ruby.

Set Proxy-Authorization: header for “Basic” authorization.

Add the –http-proxy option

Returns a new Array formed from self with elements rotated from one end to the other.

When no argument given, returns a new Array that is like self, except that the first element has been rotated to the last position:

a = [:foo, 'bar', 2, 'bar']
a1 = a.rotate
a1 # => ["bar", 2, "bar", :foo]

When given a non-negative Integer count, returns a new Array with count elements rotated from the beginning to the end:

a = [:foo, 'bar', 2]
a1 = a.rotate(2)
a1 # => [2, :foo, "bar"]

If count is large, uses count % array.size as the count:

a = [:foo, 'bar', 2]
a1 = a.rotate(20)
a1 # => [2, :foo, "bar"]

If count is zero, returns a copy of self, unmodified:

a = [:foo, 'bar', 2]
a1 = a.rotate(0)
a1 # => [:foo, "bar", 2]

When given a negative Integer count, rotates in the opposite direction, from end to beginning:

a = [:foo, 'bar', 2]
a1 = a.rotate(-2)
a1 # => ["bar", 2, :foo]

If count is small (far from zero), uses count % array.size as the count:

a = [:foo, 'bar', 2]
a1 = a.rotate(-5)
a1 # => ["bar", 2, :foo]

Rotates self in place by moving elements from one end to the other; returns self.

When no argument given, rotates the first element to the last position:

a = [:foo, 'bar', 2, 'bar']
a.rotate! # => ["bar", 2, "bar", :foo]

When given a non-negative Integer count, rotates count elements from the beginning to the end:

a = [:foo, 'bar', 2]
a.rotate!(2)
a # => [2, :foo, "bar"]

If count is large, uses count % array.size as the count:

a = [:foo, 'bar', 2]
a.rotate!(20)
a # => [2, :foo, "bar"]

If count is zero, returns self unmodified:

a = [:foo, 'bar', 2]
a.rotate!(0)
a # => [:foo, "bar", 2]

When given a negative Integer count, rotates in the opposite direction, from end to beginning:

a = [:foo, 'bar', 2]
a.rotate!(-2)
a # => ["bar", 2, :foo]

If count is small (far from zero), uses count % array.size as the count:

a = [:foo, 'bar', 2]
a.rotate!(-5)
a # => ["bar", 2, :foo]

Returns the first element in self that is an Array whose first element == obj:

a = [{foo: 0}, [2, 4], [4, 5, 6], [4, 5]]
a.assoc(4) # => [4, 5, 6]

Returns nil if no such element is found.

Related: rassoc.

Returns the first element in self that is an Array whose second element == obj:

a = [{foo: 0}, [2, 4], [4, 5, 6], [4, 5]]
a.rassoc(4) # => [2, 4]

Returns nil if no such element is found.

Related: assoc.

Returns a new Array containing all but the first n element of self, where n is a non-negative Integer; does not modify self.

Examples:

a = [0, 1, 2, 3, 4, 5]
a.drop(0) # => [0, 1, 2, 3, 4, 5]
a.drop(1) # => [1, 2, 3, 4, 5]
a.drop(2) # => [2, 3, 4, 5]

Prepends the given objects to self:

a = [:foo, 'bar', 2]
a.unshift(:bam, :bat) # => [:bam, :bat, :foo, "bar", 2]

Array#prepend is an alias for Array#unshift.

Related: push, pop, shift.

Returns the predecessor of self (equivalent to self - 1):

1.pred  #=> 0
-1.pred #=> -2

Related: Integer#succ (successor value).

Returns self rounded to the nearest value with a precision of ndigits decimal digits.

When ndigits is negative, the returned value has at least ndigits.abs trailing zeros:

555.round(-1)      # => 560
555.round(-2)      # => 600
555.round(-3)      # => 1000
-555.round(-2)     # => -600
555.round(-4)      # => 0

Returns self when ndigits is zero or positive.

555.round     # => 555
555.round(1)  # => 555
555.round(50) # => 555

If keyword argument half is given, and self is equidistant from the two candidate values, the rounding is according to the given half value:

• :up or nil: round away from zero:

  25.round(-1, half: :up)      # => 30
  (-25).round(-1, half: :up)   # => -30
  

• :down: round toward zero:

  25.round(-1, half: :down)    # => 20
  (-25).round(-1, half: :down) # => -20
  

• :even: round toward the candidate whose last nonzero digit is even:

  25.round(-1, half: :even)    # => 20
  15.round(-1, half: :even)    # => 20
  (-25).round(-1, half: :even) # => -20
  

Raises and exception if the value for half is invalid.

Related: Integer#truncate.

Returns true if int has a zero value.

Returns true if zero has a zero value, false otherwise.

Of the Core and Standard Library classes, only Rational and Complex use this implementation.

Returns self if self is not a zero value, nil otherwise; uses method zero? for the evaluation.

The returned self allows the method to be chained:

a = %w[z Bb bB bb BB a aA Aa AA A]
a.sort {|a, b| (a.downcase <=> b.downcase).nonzero? || a <=> b }
# => ["A", "a", "AA", "Aa", "aA", "BB", "Bb", "bB", "bb", "z"]

Of the Core and Standard Library classes, Integer, Float, Rational, and Complex use this implementation.

Returns self rounded to the nearest value with a precision of digits decimal digits.

Numeric implements this by converting self to a Float and invoking Float#round.

Interprets the leading substring of self as a string of octal digits (with an optional sign) and returns the corresponding number; returns zero if there is no such leading substring:

'123'.oct             # => 83
'-377'.oct            # => -255
'0377non-numeric'.oct # => 255
'non-numeric'.oct     # => 0

If self starts with 0, radix indicators are honored; see Kernel#Integer.

Related: String#hex.