Ruby Basic - 2

1.条件文

if expression
	...
elsif expression
	...
else
	...
end

unless expression
	...
else
	...
end

"Hello" if i_am_nice
"Go away" else

2.例文

case
when expression
	...
when expression
	...
else
	...
end

case test_value
when value
	...
when value
	...
else
	...
end

3. short hand operator

> boolean ? result1 : result2
# y 값이 있으면 y, 없다면 z를 x에 할당.
> x = y || z
# x 값이 없으면 x에 y값을 할당
> x ||= y

4. loop

i = 5
loop do
	break if i <= 0
    puts "Countdown: #{i}"
    i -= 1
end
puts "Blast off!"

while boolean
	...
end

until boolean
	...
end

5.times do
    puts "Hello !"
end

1.upto(5) { puts "Hello" }
5.downto(1) { puts "Hello" }
(1..5).each { puts "Hello" }
"stirng\nstring\n".each_line {|line| puts line }
"stirng".each_char {|char| puts char }
"stirng".each_byte {|byte| puts byte }
array.each
array.each_index
array.each_with_index
hash.each
hash.each_key
hash.each_value
hash.each_pair

for fruit in ["banana", "apple", "pear"]
	puts fruit.capitalize
end