I'm trying to build a hash from an array. Basically I want to take the unique string values of the array and build a hash with a key. I'm also trying to figure out how to record how many times that unique word happens.
#The text from the .txt file:
# **Bob and George are great! George and Sam are great.
#Bob, George, and sam are great!**
#The source code:
count_my_rows = File.readlines("bob.txt")
row_text = count_my_rows.join
puts row_text.split.uniq #testing to make sure array is getting filled
Anyways I've tried http://ruby-doc.org/core/classes/Hash.html
I think I need to declare a empty hash with name.new to start I have no idea how to fill it up though. I'm assuming some iteration through the array fills the hash. I'm starting to think I need to record the value as a separate array storing the time it occurs and the word then assign the hash key to it.
Example = { ["Bob",2] => 1 , ["George",3], =>2 }
Leave some code so I can mull over it.
To get you started,
h={}
h.default=0
File.read("myfile").split.each do |x|
h[x]+=1
end
p h
Note: this is not complete solution
Related
Persoane = []
Nume = gets
Persoane.push Nume.split(",")
puts Persoane.sort
I am trying to get an user to input carachters that get split into substrings which get inserted in an array, then the program would output the strings in alphabetical order. It doesnt seem to work and I just get the array's contents, like so:
PS C:\Users\Lenovo\Desktop\Ruby> ruby "c:\Users\Lenovo\Desktop\Ruby\ruby-test.rb"
Scrie numele la persoane
Andrei,Codrin,Bradea
Andrei
Codrin
Bradea
PS C:\Users\Lenovo\Desktop\Ruby>
you can do this :
Nume = gets
puts Nume.split(",").sort
or in 1 line
array = gets.chomp.split(",").sort
The error is because of your use of push. Let's assume that you define the constant Nume by
Nume='Andrei,Codrin,Bradea'
Then, Nume.split(',') would return the Array ['Andrei', 'Codrin', 'Bradea']. When you do a Persoane.push, the whole array is added to your array Persoane as a single element. Therefore, Persoane contains only one Element, as you can verify when you do a
p Persoane
If you sort a one-element array, the result will also be just that one element - there is nothing to sort.
What you can do is using concat instead of push. This would result in Persoane being a 3-element array which can be sorted.
I'm not sure you need use constants here
If you don't need keep user input and use it somewhere, you can just chain methods like this
persons = gets.chomp.split(",").sort
For something a little different, let's not split at all.
people = gets.scan(/[^,]+/).map(&:strip).sort
This will avoid problems like multiple commas in a row yielding empty strings. Of course, you could also avoid that with:
people = gets.split(/\,+/).map(&:strip).sort
I am relatively new to coding and am learning ruby right now. I came across a problem where I have a huge data record (>100k record) consisting of unique ID and another consisting of the date of birth. So it's basically a 2D array. How do I go about creating a method such that every time when I key in method(year), it will give me all the unique ID of those born in the year i choose? And how do I loop this?
The method I tried doing is as follow:
def Id_with_year(year)
emPloyee_ID_for_searching_year = [ ]
employeelist.sort_by!{|a,b|b}
if employeelist.select{|a,b| b == year}.map{|a,b| a}
return emPloyee_ID_for_searching_year
end
end
I should point out that the ID are sorted. That's why I am trying to sort the year in this method so that it will give me all the ID for the year I key in. The output I had was that it returned me [ ] with nothing inside instead of the ID.
Sidenote: methods in ruby are to be named in snake case (this is not mandatory, though.)
The problem you experience is you return what was never changed. The below should work:
def id_with_year(year)
employeelist.sort_by(&:last) # sorting by last element of array
.select{|_,b| b == year} # select
.map(&:first) # map to the first element
end
I have a Hash
person_params = {"firstname"=>"",
"lastname"=>"tom123",
"addresses_attributes"=>
{"0"=>
{"address_type"=>"main",
"catalog_delivery"=>"0",
"street"=>"tomstr",
"city"=>"tomcity"
}
}
}
With person_params[:addresses_attributes], I get:
# => {"0"=>{"address_type"=>"main", "catalog_delivery"=>"0", "street"=>"tomstr", "zip"=>"", "lockbox"=>"", "city"=>"tomcity", "country"=>""}}
1) How can I get a new hash without the leading 0?
desired_hash = {"address_type"=>"main", "catalog_delivery"=>"0", "street"=>"tomstr", "zip"=>"", "lockbox"=>"", "city"=>"tomcity", "country"=>""}
2) How can I check whether the attributes in the new hash are empty?
Answer 1:
person_params[:addresses_attributes]['0']
Answer 2:
hash = person_params[:addresses_attributes]['0']
hash.empty?
This looks just like a params hash from Rails =D. Anyway, it seems that your addresses_attributes contains some nested attributes. This means that what you have in practice is more of an array of hashes than a single hash, and that's what you see right? Instead of it being an actually Ruby Array, it is a hash with the index as a string.
So how do you get the address attributes? Well if you only want to get the first address, here are some ways to do that:
person_params[:addresses_attributes].values.first
# OR
person_params[:addresses_attributes]["0"]
In the first case, we will just take the values from the addreses_attributes hash, which gives us an Array from which we can take the first item. If there are no values in addresses_attributes, then we will get nil.
In the second case, we will just ask for the hash value with the key "0". If there are no values in addresses_attributes, we will get nil with this method also. (You might want to avoid using the second case, if you are not confident that the addresses_attributes hash will always be indexed from "0" and incremented by "1")
Currently trying to generate a random number in a specific range;
and ensure that it would be unique against others stored records.
Using Mysql. Could be like an id, incremented; but can't be it.
Currently testing other existing records in an 'expensive' manner;
but I'm pretty sure that there would be a clean 1/2 lines of code to use
Currently using :
test = 0
Order.all.each do |ord|
test = (0..899999).to_a.sample.to_s.rjust(6, '0')
if Order.find_by_number(test).nil? then
break
end
end
return test
Thanks for any help
Here your are my one-line solution. It is also the quicker one since calls .pluck to retrieve the numbers from the Order table. .select instantiates an "Order" object for every record (that is very costly and unnecessary) while .pluck does not. It also avoids to iterate again each object with a .map to get the "number" field. We can avoid the second .map as well if we convert, using CAST in this case, to a numeric value from the database.
(Array(0...899999) - Order.pluck("CAST('number' AS UNSIGNED)")).sample.to_s.rjust(6, '0')
I would do something like this:
# gets all existing IDs
existing_ids = Order.all.select(:number).map(&:number).map(&:to_i)
# removes them from the acceptable range
available_numbers = (0..899999).to_a - existing_ids
# choose one (which is not in the DB)
available_numbers.sample.to_s.rjust(6, '0')
I think, you can do something like below :
def uniq_num_add(arr)
loop do
rndm = rand(1..15) # I took this range as an example
# random number will be added to the array, when the number will
# not be present
break arr<< "%02d" % rndm unless arr.include?(rndm)
end
end
array = []
3.times do
uniq_num_add(array)
end
array # => ["02", "15", "04"]
I'm trying to display total calls from a twilio object as well as unique calls.
The total calls is simple enough:
# set up a client to talk to the Twilio REST API
#sub_account_client = Twilio::REST::Client.new(#account_sid, #auth_token)
#subaccount = #sub_account_client.account
#calls = #subaccount.calls
#total_calls = #calls.list.count
However, I'm really struggling to figure out how to display unique calls (people sometimes call back form the same number and I only want to count calls from the same number once). I'm thinking this is a pretty simple method or two but I've burnt quite a few hours trying to figure it out (still a ruby noob).
Currently I've been working it in the console as follows:
#sub_account_client = Twilio::REST::Client.new(#account_sid, #auth_token)
#subaccount = #sub_account_client.account
#subaccount.calls.list({})each do |call|
#"from" returns the phone number that called
print call.from
end
This returns the following strings:
+13304833615+13304833615+13304833615+13304833615+13304567890+13304833615+13304833615+13304833615
There are only two unique numbers there so I'd like to be able to return '2' for this.
Calling class on that output shows strings. I've used "insert" to add a space then have done a split(" ") to turn them into arrays but the output is the following:
[+13304833615][+13304833615][+13304833615][+13304833615][+13304567890][+13304833615][+13304833615][+13304833615]
I can't call 'uniq' on that and I've tried to 'flatten' as well.
Please enlighten me! Thanks!
If what you have is a string that you want to manipulate the below works:
%{+13304833615+13304833615+13304833615+13304833615+13304567890+13304833615+13304833615+13304833615}.split("+").uniq.reject { |x| x.empty? }.count
=> 2
However this is more ideal:
#subaccount.calls.list({}).map(&:from).uniq.count
Can you build an array directly instead of converting it into a string first? Try something like this perhaps?
#calllist = []
#subaccount.calls.list({})each do |call|
#"from" returns the phone number that called
#calllist.push call.from
end
you should then be able to call uniq on #calllist to shorten it to the unique members.
Edit: What type of object is #subaccount.calls.list anyway?
uniq should work for creating a unique list of strings. I think you may be getting confused by other non-related things. You don't want .split, that's for turning a single string into an array of word strings (default splits by spaces). Which has turned each single number string, into an array containing only that number. You may also have been confused by performing your each call in the irb console, which will return the full array iterated on, even if your inner loop did the right thing. Try the following:
unique_numbers = #subaccount.calls.list({}).map {|call| call.from }.uniq
puts unique_numbers.inspect