I have two arrays:
Say the array of school names is: [name1, name2, name3] and of slug names are: [slug1, slug2, slug3].
In ruby, how would I make an array [[name1, slug1], [name2, slug2], [name3, slug3]].
My attempt at the matter is kind of javascript-ish:
<% var schoolSelect = [];
for (var i=0; i<@schools.length; i++)
schoolSelect[i] = [@schools.pluck(:name)[i], @schools.pluck(:slug)[i]]; %>
You will be using Array#zip for it like:
names = %w(name1 name2 name3)
slugs = %w(slug1 slug2 slug3)
names.zip(slugs)
# [["name1", "slug1"], ["name2", "slug2"], ["name3", "slug3"]]
Suggest you consider a Hash for that data structure
schools = ["first", "second", "third"]
slugs = ["a", "b", "c"]
school_slugs = {}
(0..2).each do |position|
school_slugs[schools[position]] = slugs[position]
end
# => 0..2
school_slugs
# => {"first" => "a", "second" => "b", "third" => "c"}
If you use Arup's approach you can also make that into a Hash, i.e.
[["name1", "slug1"], ["name2", "slug2"], ["name3", "slug3"]].to_h
# => {"name1"=>"slug1", "name2"=>"slug2", "name3"=>"slug3"}
each_with_object({}) insted of predefining hashnames = %w(name1 name2 name3)
slugs = %w(slug1 slug2 slug3)
Whenever you have two arrays of the same size, as here,
names.zip(slugs)
#=> [["name1", "slug1"], ["name2", "slug2"], ["name3", "slug3"]]
and
[names, slugs].transpose
#=> [["name1", "slug1"], ["name2", "slug2"], ["name3", "slug3"]]
are interchangeable.
for.(0..2).each do |position|code and also anend