Results for: "partition"

Returns a new hash with the nil values/key pairs removed

h = { a: 1, b: false, c: nil }
h.compact     #=> { a: 1, b: false }
h             #=> { a: 1, b: false, c: nil }

Removes all nil values from the hash. Returns nil if no changes were made, otherwise returns the hash.

h = { a: 1, b: false, c: nil }
h.compact!     #=> { a: 1, b: false }

Removes every environment variable.

Returns a new hash created by using environment variable names as values and values as names.

Returns the ARGV array, which contains the arguments passed to your script, one per element.

For example:

$ ruby argf.rb -v glark.txt

ARGF.argv   #=> ["-v", "glark.txt"]

This is a deprecated alias for each_char.

Reads the next character from ARGF and returns it as a String. Raises an EOFError after the last character of the last file has been read.

For example:

$ echo "foo" > file
$ ruby argf.rb file

ARGF.readchar  #=> "f"
ARGF.readchar  #=> "o"
ARGF.readchar  #=> "o"
ARGF.readchar  #=> "\n"
ARGF.readchar  #=> end of file reached (EOFError)

Writes string if inplace mode.

Returns the current filename. “-” is returned when the current file is STDIN.

For example:

$ echo "foo" > foo
$ echo "bar" > bar
$ echo "glark" > glark

$ ruby argf.rb foo bar glark

ARGF.filename  #=> "foo"
ARGF.read(5)   #=> "foo\nb"
ARGF.filename  #=> "bar"
ARGF.skip
ARGF.filename  #=> "glark"

Start tracing

Example

Tracer.on
# code to trace here
Tracer.off

You can also pass a block:

Tracer.on {
  # trace everything in this block
}

Returns a network byte ordered string form of the IP address.

Returns true iff the current severity level allows for the printing of WARN messages.

Log a WARN message.

See info for more information.

Creates a matrix where the diagonal elements are composed of values.

Matrix.diagonal(9, 5, -3)
  =>  9  0  0
      0  5  0
      0  0 -3

Creates an n by n diagonal matrix where each diagonal element is value.

Matrix.scalar(2, 5)
  => 5 0
     0 5

Returns true if this is a diagonal matrix. Raises an error if matrix is not square.

Returns true if this is a regular (i.e. non-singular) matrix.

Returns true if this is a singular matrix.

Returns true if this is a square matrix.