Keywords / Symbols Flashcards
(53 cards)
BEGIN
Run this block when the script starts.
BEGIN { puts “hi” }
END
Run this block when the script is done.
END { puts “hi” }
alias
Create another name for a function.
alias X Y
and
Logical ‘and’, but lower priority than &&.
puts “Hello” and “Goodbye”
begin
Start a block, usually for exceptions.
begin end
break
Break out of a loop right now.
while true; break; end
case
Case style conditional, like an if.
case X; when y; else; end
class
Define a new class.
class x; end
def
Define a new function.
def X( ); end
defined?
Is the class/function/etc. defined already?
defined? Class == “constant”
do
Create a block that maybe takes a parameter.
(0..5).each do |x| puts x end
else
Else conditional
if X; else; end
elsif
Else conditional
if X; elsie Y; else; end
end
Ends blocks, functions, classes, everything
begin end # many others
ensure
Run this code whether an exception happens or not.
being ensure end
for
For loop syntax. the .each syntax is preferred.
for X in Y; end
if
if conditional.
if X; end
in
In part of for-loops.
for X in Y; end
module
Define a new module.
module X; end
next
Skip to the next element of a .each iterator.
(0..5).each {|y| next}
not
Logical ‘not’. But use ! instead.
not true == false
or
Logical ‘or’.
puts “Hello” or “Goodbye”
redo
Rerun a code block exactly the same.
(0..5).each {|i| redo if i > 2}
rescue
Run this code if an exception happens.
begin rescue X; end
