Block iteration issues

Ruby
1

Hello,

I’m struggling with this stuff and can’t find an answer so please
advise.
What I’m trying to achieve

@collection has 7 elements
I want to:

  • cycle through all those elements
  • assign element[“smth”] through element[“smth3”] to @ data.set1_smth
    through @data.set1_smth3
  • the last iteration would be assigning element[“smth”] to
    @data.set7_smth etc

I just don’t seem to grasp how to change @data.set1_smth into
@data.set2_smth etc. when iterating the block.

i = 1
@collection.elements.each do |item|
@data.set1_smth = item.elements[“smth”] # obviously
@data.set1_smth should be somehow different
@data.set1_smth2 = item.elements[“smth2”]
@data.set1_smth3 = item.elements[“smth3”]
i += 1
end

Can anybody help?
I tried @data.send(“set” + i + “_smth”) but that didn’t seem to work.
Thanks in advance.

Radek

2

Gromobij Swietlisty wrote:

Hello,

I’m struggling with this stuff and can’t find an answer so please
advise.
What I’m trying to achieve

@collection has 7 elements
I want to:

  • cycle through all those elements
  • assign element[“smth”] through element[“smth3”] to @ data.set1_smth
    through @data.set1_smth3
  • the last iteration would be assigning element[“smth”] to
    @data.set7_smth etc

I just don’t seem to grasp how to change @data.set1_smth into
@data.set2_smth etc. when iterating the block.

i = 1
@collection.elements.each do |item|
@data.set1_smth = item.elements[“smth”] # obviously
@data.set1_smth should be somehow different
@data.set1_smth2 = item.elements[“smth2”]
@data.set1_smth3 = item.elements[“smth3”]
i += 1
end

Can anybody help?
I tried @data.send(“set” + i + “_smth”) but that didn’t seem to work.
Thanks in advance.

Radek

  • assign element[“smth”] through element[“smth3”] to @ data.set1_smth
    through @data.set1_smth3

If you are naming variables like this:

val1 = 5
val2 = 7
val3 = -3

that tells you that you should be using an array instead:

arr = []
arr[0] = 5
arr[1] = 7
arr[2] = -3

@collection.elements

------------------------------------------------------- Vector::elements
Vector::elements(array, copy = true)

 Creates a vector from an Array. The optional second argument
 specifies whether the array itself or a copy is used internally.

Why are you creating a Vector in order to step through the items of your
array?

Can anybody help?

collection = [1, 2, 3, 4, 5, 6, 7]
data = []

collection.each do |item|
data << item
end

p data