Produces a version of str with all non-printing characters replaced by \nnn notation and all special characters escaped.
"hello \n ''".dump #=> "\"hello \\n ''\""
Returns an array of the Integer ordinals of the characters in str. This is a shorthand for str.each_codepoint.to_a.
If a block is given, which is a deprecated form, works the same as each_codepoint.
Returns a copy of str with all characters in the intersection of its arguments deleted. Uses the same rules for building the set of characters as String#count.
"hello".delete "l","lo" #=> "heo" "hello".delete "lo" #=> "he" "hello".delete "aeiou", "^e" #=> "hell" "hello".delete "ej-m" #=> "ho"
Performs a delete operation in place, returning str, or nil if str was not modified.
Returns 0 if the value is positive, pi otherwise.
Returns the file descriptor used in dir.
d = Dir.new("..") d.fileno #=> 8
This method uses dirfd() function defined by POSIX 2008. NotImplementedError is raised on other platforms, such as Windows, which doesn’t provide the function.
Deletes the named directory. Raises a subclass of SystemCallError if the directory isn’t empty.
Deletes the named files, returning the number of names passed as arguments. Raises an exception on any error. See also Dir::rmdir.
Returns true if the named file is readable by the effective user and group id of this process. See eaccess(3).
Returns true if the named file is writable by the effective user and group id of this process. See eaccess(3).
Returns true if the named file is executable by the effective user and group id of this process. See eaccess(3).
Returns true if the named file exists and is a regular file.
file can be an IO object.
If the file argument is a symbolic link, it will resolve the symbolic link and use the file referenced by the link.
Returns true for dummy encodings. A dummy encoding is an encoding for which character handling is not properly implemented. It is used for stateful encodings.
Encoding::ISO_2022_JP.dummy? #=> true Encoding::UTF_8.dummy? #=> false
Returns the return value of the iterator.
o = Object.new def o.each yield 1 yield 2 yield 3 100 end e = o.to_enum puts e.next #=> 1 puts e.next #=> 2 puts e.next #=> 3 begin e.next rescue StopIteration => ex puts ex.result #=> 100 end
Multiply by the specified value.
e.g.
c = a.mult(b,n) c = a * b
If specified and less than the number of significant digits of the result, the result is rounded to that number of digits, according to BigDecimal.mode.
Method used to provide marshalling support.
inf = BigDecimal.new('Infinity') #=> Infinity BigDecimal._load(inf._dump) #=> Infinity
See the Marshal module.
Returns true if the given year is a leap year of the proleptic Gregorian calendar.
Date.gregorian_leap?(1900) #=> false Date.gregorian_leap?(2000) #=> true
Returns true if the date is before the day of calendar reform.
Date.new(1582,10,15).julian? #=> false (Date.new(1582,10,15) - 1).julian? #=> true
Returns true if the year is a leap year.
Date.new(2000).leap? #=> true Date.new(2001).leap? #=> false
This method is equivalent to new_start(Date::JULIAN).
Returns the number of entries in the database.
Deletes an entry from the database.
Deletes all data from the database.
Returns the number of struct members.
Customer = Struct.new(:name, :address, :zip) joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345) joe.length #=> 3