All Questions
7,678
questions
0
votes
1
answer
86
views
Undefined method `name' for an instance of Array (NoMethodError)
I am trying to add an element into an instance of array by using push(<<) to insert variables new_name and new_origin into ingredients array but I am receiving this error: undefined method `name'...
- 1
-2
votes
1
answer
91
views
syntax error, unexpected ')', expecting '=' (SyntaxError) [closed]
Letters1 = Array["A","B"]
password1 = nil
while password1 != "A"
letter1 = Letters1[rand(0...2)]
letter2 = Letters1[rand(0...2)]
password1 = (letter1)
File.write(&...
0
votes
1
answer
79
views
How can I incrementally increase a displayed array element using a rails button?
I have two arrays @necklines and @skirts, made up of all Neckline models, and Skirt models respectively.
I am attempting to show one neckline and one skirt at a time, and having two buttons to either ...
- 3
0
votes
2
answers
67
views
Generate array based on two others
I have two arrays:
[["106373", "106374", "106375", "106376"], ["106377", "106378", "220183", "220184"], ["220185&...
- 11
0
votes
6
answers
114
views
Locate index of mismatch in an array
I have an array that should contain the same value throughout and if there are mismatches, I want to pull the index of those mismatches.
Example:
[1,1,1,1,3,1,1,1,2,1,1,1]
Output:
[4, 8]
What's the ...
- 6,554
0
votes
1
answer
67
views
Iterating over a Nested array in ruby
test_scores = [
[97, 76, 79, 93], [79, 84, 76, 79], [88, 67, 64, 76], [94, 55, 67, 81]
]
puts test_scores.any? do |scores|
scores.all? { |score| score > 80 }
end
When I run the above code on ...
0
votes
2
answers
50
views
Ruby on Rails seems to corrupt a constant in a method
my Constant seems be be modified but how can it be.
the environment is rails 7.0.7.2
Ruby 3.1.2p20 via rbenv
Consider
module ArrayTestMethods
PROFILE_PARAMS = [["id","id"],["...
- 21
-1
votes
3
answers
153
views
Ruby complex strings array to array of float
I'm trying to convert this (rather complex) string array of float strings into an array of float with no luck:
[ 5.85142857 6.10684807 6.15328798 6.31582766 6.96598639
7.61614512 7....
- 1,452
2
votes
1
answer
88
views
Ruby #union on Array reacts very strangely
I like to use the Array#union or #| method to return an array of objects where duplicates are removed. I have a custom implementation of eql? on my class.
There is a really strange behaviour if I do ...
- 2,247
1
vote
2
answers
246
views
Matching of randomly ordered array when test nested hash with RSpec
In my RSpec tests I often have the challenge to compare deep nested hashes like this
{ foo: ["test", { bar: [1,2,3] }] }
The values [1,2,3] are read from a DB where the order is not ...
- 14.5k
0
votes
5
answers
139
views
How to check if a value exists in the first member of a two dimensional array
I'm trying to check if any of the first value of a two-dimensional array has the value i'm testing. The array is like this
[[2,5],[3,1],[4,1]]
I want to check only the first member of the array (here ...
- 203
0
votes
1
answer
117
views
How do you efficiently chain array methods in Ruby
So let's say I have this MWE code:
# see below for full code - not important here
class RealEstate; attr_accessor :name; attr_accessor :living_space; attr_accessor :devices; def initialize(name, ...
- 129
1
vote
2
answers
68
views
Ruby way instead of for loop in specific case of array iteration
Coming from other languages where for loop is predominant way of iterating, I am curious is there a better more Ruby style way to achieve below:
q=[5,1,7,9,0,3,6,8,0]
for i in 0..q.size/3-1
do one ...
- 13
1
vote
2
answers
69
views
How to insert an object in an array of object while looping in rails
controller.rb
def index
@expenses = Expense.all.order(:expense_type_id)
end
@expenses looks like as below
[#<Expense:0x00007faeb044c6e8
id: 1,
amount: 120
expense_type_id: 1>,
#<...
- 1,337
0
votes
1
answer
64
views
why when I call a function passing a reference to an array, the array is changing in ruby? [closed]
I was following a tutorial on creating a little game in Ruby when I fell into a bug I couldn't understand. When I looked closely, I realized that the error was happening in line 51 of the fogefoge.rb ...
