Reading from standard in- Kernel#gets normally retrieves one line at a time. To get the entire contents of STDIN, pass it nil.
gets p
Example usage: reverse entire input : Solution
You can also use the STDIN IO variable $<, but this is one byte longer (or equal, if using gets(p)), so often not worthwhile. It evaluates to true when tested as a boolean, which may be useful.
$<.read
Example usage: reverse entire input : Solution
- String#split splits on whitespace by default. But pass it an empty RegExp, and it splits the string into individual characters.
while gets.split //
Often, using Kernel#getc is superior to the above. However, the characters are returned as numbers (0..255) rather than strings.
while getc
Writing to standard out- For printing numbers with a newline, you can use use Kernel#p.
p 24
- For printing anything else without a newline, you can usually use the STDOUT variable $>. Note that all the other printing methods return nil... this method returns an IO object, which evaluates to true in boolean tests.
$><<24
Looping - As nice as Enumerable#each is for readability, it is actually rather bloated for total character count. Try using Enumerable#map or inline while instead.
gets.split(//).map{|i|...}
(...)while gets # The parenthesis are unnecessary if there is only one statement in the while.
Other Ruby tricks - Kernel#p does nothing and returns nil. That makes it a short way to get nil or false.
gets p
- Numbers from 100 to 255 can be specified using ?d syntax, which returns the byte value of the following character. You might need a hex editor to insert high-byte characters.
100==?d
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