I am trying to write a small program that goes through an array's values outputting each individual value. When it reaches 15 it stops and outputs "too big".
Why is my logic below wrong, it makes sense to me..
x = [10,11,12,13,14,15,16,17,18]
def counting
for x[y]
while y < 15
puts y
else
puts "too big"
end
puts counting
I'm just learning sorry if this is a really simple solution.
That's nothing at all like Ruby syntax. You want a .each and a simple if statement:
x.each do |y|
if y < 15
puts y
else
puts "too big"
break
end
end
It appears though you are trying to use Ruby like you would a c-style programming language. It's possible and viable, albeit not recommended.
Ruby has structure known as code blocks. Code blocks are sort of like anonymous functions. You can read more about code blocks here.
x = [10,11,12,13,14,15,16,17,18]
# This is a code block.
x.each do |y| # The y between the '|'s is the parameter caught by the code block
if y < 15
puts y
else
puts "Too big."
break # Break out of the loop
end
end
If you want a one liner:
x.each {|y| y < 15 ? puts(y) : puts("too big") || break }
If you insist using while, it can be done as following:
i = 0
while i do
x[i] < 15 ? puts(x[i]) : puts("too big") || break
i+=1
end
I think the cleanest way to do this using while would be:
def counting(x)
i = 0
while x[i] < 15
puts x[i]
i += 1
end
puts 'too big'
end
counting([10,11,12,13,14,15,16,17,18])
Why is my logic below wrong, it makes sense to me..
Given that you program isn't even syntactically legal, it's impossible to tell what its semantics would be if it were syntactically legal, let alone why those semantics were wrong. However, here's an idiomatic Ruby solution (you will almost never use nor see while in any Ruby code, and you will certainly never see for):
puts x.take_while {|n| n < 15 }
puts 'too big'
I prefer writing in point-free style, however in this case the only way to do that is to make use of the symmetry of the condition and invert the order of operands, which will lead to awkward logic:
x.take_while(&15.method(:>))
Ao, in this case I would rather avoid point-free style, because it no longer matches the original specification literally. Instead of "take all numbers less than 15", we now have "take all numbers such that 15 is greater than those numbers", which reads awkward.
putsiterates over arrays by itself. You don't have to dox.each { |e| puts e },puts xalone will do. Try it.