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If I have a hash
{"one"=>1, "two"=>2, "three"=>3}
What is the best way to map the keys to get the array:
["one", "two", "three"]
{"one"=>1, "two"=>2, "three"=>3}.keys #=> ["one", "two", "three"]
The documentation is awesome for discovering answers to questions like these.
If the question is "how do I get X data from object of type Y?", reading through the docs for object type Y should be the first place you go.
{"one"=>1, "two"=>2, "three"=>3}.keys
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Closed 2 years ago.
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ruby newbie here.
The Data::Dumper->Dump(object) method in perl is awesome. It logs the entire structure of any object into stdout. Makes it really easy to debug. Basically looking for a method which can print the structure of any object irrespective of its type.
Is there a similar library/method in ruby?
Ruby has two such methods for debugging: p and pp.
The p(x) method is equivalent to:
puts x.inspect
The pp method is similar but pretty. That is it gives a more human-readable output.
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Closed 7 years ago.
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myhash = {answer: "yes", something: hello, another: "yes"}
myhash.delete[another]
I want to delete the another key-value pair. But, ruby gives me an error saying wrong number of arguments (0 for 1). What's going on?
the method delete is a method, not an element on the hash , and another key is a symbol, so you should call on this form
myhash.delete(:another)
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Closed 8 years ago.
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Is there a Ruby tool or editor plugin that will convert an array literal into a %w array literal?
ARRAY = [
"Foo",
"Bar",
"Baz"
]
ARRAY = %w(
Foo
Bar
Baz
)
I know I could write my own regex to do this, but I'm hoping for something off-the-shelf. I'm already using Rubocop as a linter, but it doesn't cover it. I can't seem to find a plugin for RubyMine, Sublime, or Atom for it either.
You can use rubocop -a to autocorrect offenses. One of the default cops is the word array cop, which should have you covered.
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Is there a way to pull a random element from a list? Like say, picking a random name from a list of 10 names.
You can use Array#sample if the list is an array:
names.sample
Otherwise, if it's a string, you can convert it into an array first:
names.split.sample
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I have a number that comes from an external API but it has two extra zeros at the end. What would be a solution to remove the two zeros. I have tried the chomp method and that doesn't work. The number I receive from the API is a Bignum. I am using Ruby 2.
This is a sample input from the API is 1374577200000
This is a sample output I want is 13745772000
If the number is an integer, you can use integer division:
> 123456 / 100
=> 1234
You can't chomp a Fixnum or Bignum, so you'd have to convert it back and forth:
number = 123400
number.to_s[0..-3].to_i