Check if part of array is included

Question

Let's say I have a array:

newArray = Array.[]

And then I push some strings in it:

newArray.push 'nil'  
newArray.push 'nil2'  
newArray.push 'nil3'

Now I make a while loop:

while true  
    load = gets.chomp

    if newArray[].include? load  
        puts 'That pieace of the Array is loaded' 
        break 
    end  
end

The part if newArray[].include? load is wrong, I know. But how can I make it so this will work?

So you want to check if load is in the array OR if load is a substring of one of the elements in the array? — Luiggi Mendoza
– Luiggi Mendoza, Commented Sep 12, 2014 at 14:51
Pretty confident when he says part of array is loaded he actually means that element exists. — Nobita
– Nobita, Commented Sep 12, 2014 at 14:55
@LuiggiMendoza I want to check if load is a substring of one of the elements in the array, by only typing 0/1/2 (one of those options) — Remco
– Remco, Commented Sep 12, 2014 at 15:18

the Tin Man · Accepted Answer · 2014-09-12 16:37:12Z

Your question is confusing, and your code isn't idiomatic Ruby. Consider writing it like:

new_array = []
new_array << 'nil'
new_array << 'nil2'
new_array << 'nil3'

loop do
  load = gets.chomp

  if new_array.include? load
    puts 'That piece of the Array is loaded'
    break
  end
end

We use snake_case_for_variables becauseItIsALotEasierToRead.
While we can write Array.new or Array.[], we seldom do. We usually assign [] to a variable instead.
We typically push to an array using <<. It's shorter to type, and visually sets apart what's happening.
Use loop do instead of while true.

I'd actually be more straightforward when defining that array:

new_array = %w[nil nil2 nil3]

And I'd use more mnemonic variable names so the code is more self-documenting:

ary = %w[nil nil2 nil3]

loop do
  user_input = gets.chomp

  if ary.include? user_input
    puts 'That piece of the Array is loaded'
    break
  end
end

If you want to see if the value entered is part of a string element in the array:

if ary.any? { |s| s[user_input] }
  puts 'That piece of the Array is loaded'
  break
end

If you want to see if the value entered is the last character of a string element in the array:

if ary.any? { |s| s[-1] == user_input }

or:

if ary.any? { |s| s[/#{ user_input }$/] }

Read the documentation for any? to understand what it's doing.

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