Integer is the basis for the two concrete classes that hold
whole numbers, Bignum and Fixnum.
|
instance methods
|
|
chr
|
int.chr -> aString
|
|
Returns a string containing the ASCII character represented by
the receiver's value.
|
65.chr
|
» |
"A"
|
|
?a.chr
|
» |
"a"
|
|
230.chr
|
» |
"\346"
|
|
|
downto
|
int.downto( anInteger ) {| i | block }
-> int
|
|
Iterates block, passing decreasing values
from int down to and including anInteger.
5.downto(1) { |n| print n, ".. " }
print " Liftoff!\n"
|
produces:
5.. 4.. 3.. 2.. 1.. Liftoff!
|
|
|
integer?
|
int.integer? -> true
|
|
Always returns true.
|
|
next
|
int.next -> anInteger
|
|
Returns the Integer equal to int + 1.
|
|
step
|
int.step( endNum, step ) {| i | block }
-> int
|
|
Invokes block with the sequence of numbers starting at int,
incremented by step on each call. The loop
finishes when the value to be passed to the block is greater
than endNum (if step is positive) or less than endNum (if step is negative).
1.step(10, 2) { |i| print i, " " }
|
produces:
|
|
succ
|
int.succ -> anInteger
|
|
Synonym for
Integer#next
.
|
|
times
|
int.times {| i | block }
-> int
|
|
Iterates block int times, passing in values from zero to int - 1.
5.times do |i|
print i, " "
end
print "\n"
|
produces:
|
|
upto
|
int.upto( anInteger ) {| i | block }
-> int
|
|
Iterates block, passing in integer values from int up to and including anInteger.
5.upto(10) { |i| print i, " " }
|
produces:
|
Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"
Copyright
©
2001 by Addison Wesley Longman, Inc. This material may
be distributed only subject to the terms and conditions set forth in
the Open Publication License, v1.0 or later (the latest version is
presently available at http://www.opencontent.org/openpub/)).
Distribution of substantively modified versions of this document is
prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard
(paper) book form is prohibited unless prior permission is obtained
from the copyright holder.
