Ex. 37 - Keyword

Question 1

BEGIN

Answer 1

Run this block when the script starts

BEGIN { puts “hi” }

Question 2

END

Answer 2

Run this block when the script is done

END {puts “hi” }

Question 3

alias

Answer 3

Create another name for a function.

alias X Y

Question 4

and

Answer 4

Logical and, but lower priority than &&.

puts “Hello” and “Goodbye”

Question 5

begin

Answer 5

Start a block, usually for exceptions.

begin end

Question 6

break

Answer 6

Break out of a loop right now.

while true; break; end

Question 7

case

Answer 7

Case style conditional, like an if.

case X; when Y; else; end

Question 8

class

Answer 8

Define a new class.

class X; end

Question 9

def

Answer 9

Define a new function.

def X( ); end

Question 10

defined?

Answer 10

Is this class/function/etc. defined already?

defined? Class == “constant”

Question 11

do

Answer 11

Create a block that maybe takes a parameter.

(0..5).each do |x| puts x end

Question 12

else

Answer 12

Else conditional.

if X; else; end

Question 13

elsif

Answer 13

Else if conditional

if X; elsif Y; else; end

Question 14

end

Answer 14

Ends blocks, functions, classes, everything

begin end # many others

Question 15

ensure

Answer 15

Run this code whether an exception happens or not.

begin ensure end

Question 16

for

Answer 16

For loop syntax. The .each syntax is preferred.

for X in Y; end

Question 17

if

Answer 17

If conditional.

if X; end

Question 18

in

Answer 18

In part of for-loops.

for X in Y; end

Question 19

module

Answer 19

Define a new module

module X; end

Question 20

next

Answer 20

Skip to the next element of a .each iterator.

(o..5).each { |y| next }

Question 21

not

Answer 21

Logical not. But use ! instead.

not true == false

Question 22

or

Answer 22

Logical or.

puts “Hello” or “Goodbye”

Question 23

redo

Answer 23

Rerun a code block exactly the same.

(0..5).each { |i| redo if i > 2 }

Question 24

rescue

Answer 24

Run this code if an exception happens.

begin rescue X; end

Question 25

retry

Answer 25

In a rescue clause, says to try the block again.

(0..5).each { |i| retry if i > 2 }

Question 26

return

Answer 26

Returns a value from a function. Mostly optional.

return X

Question 27

self

Answer 27

The current object, class, or module.

defined? self == “self”

Question 28

super

Answer 28

The parent class of this class.

super

Question 29

then

Answer 29

Can be used with if optionally.

if true then puts “hi” end

Question 30

undef

Answer 30

Remove a function definition from a class.

undef X

Question 31

unles

Answer 31

Inverse of if.

unless false then puts “not” end

Question 32

until

Answer 32

Inverse of while, execute block as long as false.

until false; end

Question 33

when

Answer 33

Part of case conditionals.

Case X; when Y; else; end

Question 34

while

Answer 34

While loop.

while true; end

Question 35

yield

Answer 35

Pause and transfer control to the code block.

yield