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Ruby Ruby Foundations Hashes Creating Hashes

Nicholas Lee
Nicholas Lee
12,474 Points
Posted by Nicholas Lee
Nicholas Lee
12,474 Points

Creating Hashes, getting => nil

When jason adds a new value to the hash and then prints it looks like this.

ap h { "name" => "Jason" "hello" => "world" } => {"name"=>"Jason", "hello"=>"world"}

When I do it, I only get back, then a => nil

ap h { "bye" => "world", "name" => "Nick" } => nil

Is this an "ap" issue? When I was originally setting it up and typed in require 'rubygems' it returned false. Someone posted and said that only means you are already using it.

Why am I missing => {"name"=>"Jason", "hello"=>"world"} ? And what does that mean?

Eric Carey
Eric Carey
6,820 Points
Eric Carey
Eric Carey
6,820 Points

Not sure if you're still on this, but the information you received was correct. Typing: 

require 'rubygems'

Will return "=> false" from Ruby 1.9 and up because it's required by default. Basically if you require a gem in irb and you get "=> false" without an error message, then it's probably already loaded.

To solve this specific issue, try typing:

require 'awesome_print'

If you get "=> true", then try running the hash exercise again. Should work this time. If you get an error message, then it may not have installed properly.

Edit: I obviously couldn't read the markdown sheet.

2 Answers

Dan Mirda
Dan Mirda
3,992 Points
Dan Mirda
Dan Mirda
3,992 Points

==Quote:

"When jason adds a new value to the hash and then prints it looks like this.

ap h { "name" => "Jason" "hello" => "world" } => {"name"=>"Jason", "hello"=>"world"}"

==EndQuote

I don't think that is what he did in the video. If you stop the video at 4:37 it appears he did the following:

$  h = { "name" => "Jason", "hello" => "world" }
=> { "name" => "Jason", "hello" => "world" }
$  ap h
{
       "name" => "Jason", 
        "hello" => "world"
}

The assignment of the hash to h is on a seperate line of the call to ap where h is a parameter.

Rachel Klein
Rachel Klein
7,388 Points
Rachel Klein
Rachel Klein
7,388 Points

I am having this same issue: whenever I try to create a hash, => nil is returned. I tried the solutions above (going through the "require" sequence again) and I am still getting the same results. Does anyone have any other ideas?