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Ruby

Posted by Lyric Abbott
Lyric Abbott
35,595 Points

help...im confused with this one to

Add the grocery_item hash to the items array inside of the grocery_list hash.

http://teamtreehouse.com/library/ruby-collections/build-a-grocery-list-program/working-with-hashes-that-contain-arrays

6 Answers

Chris Shaw
Chris Shaw
26,676 Points

Hi Lyric,

The challenge is asking you to append the dictionary grocery_item to the grocery_list items array, i.e the below.

grocery_list['items'].push(grocery_item)
Clair Griffiths
Clair Griffiths
10,158 Points
Clair Griffiths
Clair Griffiths
10,158 Points

Hi Chris

Thanks for your answer, it was really helpful to me! Are you able to explain to me why 'items' is within square brackets? Aren't square brackets indicative on an array? My understanding is that the array within the grocery_list variable is the value that pairs with the 'item' key, not the key itself.

Thanks in advance

Clair

Chris Shaw
Chris Shaw
26,676 Points

Hi Clair,

The square brackets serve different purposes depending on the context in which you use them, for example in this code challenge we use the square brackets with a string value of items against the grocery_list variable as it's a dictionary and dictionaries offer the ability to select <key:value> pairs using the square brackets.

When used standalone however that infers an array which is what we're retrieving by targeting the items key in the dictionary.

Hope that helps.

Clair Griffiths
Clair Griffiths
10,158 Points
Clair Griffiths
Clair Griffiths
10,158 Points

Ok, that makes so much more sense now, thank you so much for taking the time to respond!

Thanks!

viacheslavklepach
viacheslavklepach
5,767 Points
viacheslavklepach
viacheslavklepach
5,767 Points

Thx guys! This is wrong:

grocery_list['items'] = grocery_item
> {"title"=>"Grocery List", "items"=>{"title"=>"Bread", "quantity"=>1}}

This is ok:

grocery_list['items'].push(grocery_item)
> {"title"=>"Grocery List", "items"=>[{"title"=>"Bread", "quantity"=>1}]}
andynguyen9
andynguyen9
1,629 Points

When I did it in the command line, it shows:

{"title"=>"Grocery List", "items"=>[]}

and then when I put grocey_list on the command line, it shows the same.

Why is that? Thank you.

Muhammad sharifi
Muhammad sharifi
4,455 Points

thanks

Nasser Sanou
Nasser Sanou
6,899 Points
Nasser Sanou
Nasser Sanou
6,899 Points

grocery_list['items'].push(grocery_item)

andynguyen9
andynguyen9
1,629 Points
andynguyen9
andynguyen9
1,629 Points

I read the response, reread and didn't comprehend at all. :-( I know the formula for push is: hash1.push(hash2) but why grocery_list['items'].push(grocery_item) ??

Something wrong with me?