Bang methods
(Exclamation point at the end of the method name)
There are methods that have a permanent or dangerous version. The exclamation point designates to use the dangerous version of the method.
String manipulation
The bang versions of the string manipulation methods (with the exclamation point), modify the string variable in place. Some of these methods are
- sub
- gsub
- reverse
- sort
The original string ‘gsub’ substitution method:
original = 'My old cat'
new = original.gsub('old', 'new')
results:
original = 'My old cat'
new ='My new cat'
The dangerous (bang) ‘gsub’ method with the exclamation point modifies the original variable:
original = 'My old cat'
original.gsub!('old', 'new')
results:
original = 'My new cat'
Kernel::exit
The script exits with Kernel::exit, but Kernel::exit! causes an immediate exit, bypassing any exit handlers.