Week 2, day 6

All I want is to print out my menu. To be precise, my hash keys and values. Surely it can't be that hard, right? Wrong!
Here is where I start to hate myself for forgetting things I've already learnt the hard way. Luckily though, in my past life I was a bit of a pro at trouble-shooting the technical side of creative projects, so this feeling is very familiar to me.
I find I have to make the same mistake 2 or 3 times before the lesson really sinks in, and I can say for sure I won't be repeating this mistake.
Here's my menu and how I want it to appear:

1 menu  = { meal_small: 5, meal_medium: 10, meal_large: 15 }

meal_small: £5

meal_medium: £10

meal_large: £15

This is such a silly mistake that I'm embarassed to even confess to it, but I think it's important that I do.

1 to_return = ''
2 menu.each { |key, value| to_return << key.to_s << ': £' << value.to_s << '\n' }
3 puts to_return

"mealsmall: £5\nmealmedium: £10\nmeal_large: £15\n"

So, that's obviously not what I wanted, and I did actually struggle for a little while wrapping my head around the problem, IRB to the rescue.
Then I remembered that you can't use escape characters in single-quotes, once I amended all singles to double quotes it actually worked.

1 to_return = ""
2 menu.each { |k, v| to_return << k.to_s << ": £" << v.to_s << "\n" }
3 puts to_return
4 
5 to_return = ""
6 menu.map { |k, v| to_return << "#{k.to_s}: £#{v.to_s}\n" }
7 puts to_return

Both of the above give the desired output:

meal_small: £5

meal_medium: £10

meal_large: £15

Here are the tests I ran:

 1 menu = { meal_small: 5, meal_medium: 10, meal_large: 15 }
 2 
 3 to_return = ''
 4 menu.map { |key, value| to_return << key.to_s + ': £' + value.to_s }
 5 p '1'
 6 puts to_return
 7 
 8 to_return = ''
 9 menu.map { |key, value| to_return << "#{key}: £#{value}" }.join(', ')
10 p '2'
11 puts to_return
12 
13 to_return = ''
14 menu.each { |key, value| to_return << key.to_s << ': £' << value.to_s << '\n' }
15 p '3'
16 puts to_return
17 
18 # to_return = ''
19 # menu.join(': £', ', ')
20 # p '4'
21 # puts to_return
22 
23 to_return = ""
24 menu.each { |k, v| to_return << k.to_s << ": £" << v.to_s << "\n" }
25 p "5"
26 puts to_return
27 
28 to_return = ""
29 menu.map { |k, v| to_return << "#{k.to_s}: £#{v.to_s}\n" }
30 p "6"
31 puts to_return
32 
33 to_return = ''
34 menu.each { |k, v| to_return << k.to_s << ': £' << v.to_s << '\n' }
35 p '7'
36 puts to_return
37 
38 to_return = ''
39 menu.map { |k, v| to_return << '#{k.to_s}: £#{v.to_s}\n' }
40 p '8'
41 puts to_return

And the STDOUT:

 1 "1"
 2 meal_small: £5meal_medium: £10meal_large: £15
 3 
 4 "2"
 5 meal_small: £5meal_medium: £10meal_large: £1
 6 
 7 "3"
 8 meal_small: £5\nmeal_medium: £10\nmeal_large: £15\n
 9 
10 "5"
11 meal_small: £5
12 meal_medium: £10
13 meal_large: £15
14 
15 "6"
16 meal_small: £5
17 meal_medium: £10
18 meal_large: £15
19 
20 "7"
21 meal_small: £5\nmeal_medium: £10\nmeal_large: £15\n
22 
23 "8"
24 #{k.to_s}: £#{v.to_s}\n#{k.to_s}: £#{v.to_s}\n#{k.to_s}: £#{v.to_s}\n

Written on March 28, 2015