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32 Cards in this Set
- Front
- Back
- 3rd side (hint)
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BEGIN |
Run this block when the script starts. |
BEGIN { puts "hi" } |
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END |
Run this block when the script is done. |
END { puts "hi" } |
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alias |
Create another name for a function |
alias X Y |
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begin |
Start a block, usually for exceptions. |
begin end |
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break |
break out of a block right now. |
while true; break; end |
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case |
Case style conditional, like an if. |
case X; when Y; else; end |
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class |
Define a new class. |
class X; end |
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def |
Define a new function. |
def X(); end |
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defined? |
Is this class/function/etc already defined? |
defined? Class == "constant" |
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do |
Create a block that maybe takes a parameter. |
(0..5) .each do |x| puts x end |
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else |
Else conditional. |
if x; else; end |
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elsif |
Else if conditional. |
if x; elsif Y; else; end |
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end |
Ends blocks, functions, classes, everything. |
begin end # many others |
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ensure |
Run this code whether an exception happens or not. |
begin ensure end |
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for |
For loop syntax. The .each syntax is preferred. |
for X in Y; end |
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if |
If conditonal. |
if X; end |
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in |
In part of for-loops. |
for X in Y; end |
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module |
Define a new module. |
module X; end |
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next |
Skip to the next element of a .each iterator. |
(0..5) .each {|y| next } |
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redo |
Rerun a code block exactly the same. |
(0..5) .each {|i| redo if i >2 } |
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rescue |
Run this code if an exception happens. |
begin rescue X; end |
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retry |
In a rescue clause, says to try the block again. |
(0..5) .each {|i| redo if i >2 } |
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return |
Returns a value from a function. Mostly optional. |
return X |
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self |
The current object, class, or module. |
defined? self == "self" |
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super |
The parent class of this class. |
super |
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then |
Can be used with if optionally. |
if true then puts "hi" end |
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undef |
Remove a function definition from a class. |
undef X |
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unless |
Inverse of if. |
unless false then puts "not" end |
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until |
Inverse of while, execute block as long as false. |
until false; end |
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when |
Part of case conditionals. |
case X; when Y; else; end |
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while |
While loop. |
while true; end |
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yield |
Pause and transfer control to the code block. |
yield |
