CODEWITHSUNDEEP
arraysruby
Tom
Tom

Reputation: 1105

Ruby Array Index

I have what will probably become a simple question to answer.

I have an array called emails .

I'm iterating over them using emails.each do |email| .

What I want to say is:

# if array index is 0, do this.

I've tried if email.index == 0 .

I've tried to find a solution, but can't for the life of me find it. As it's only one argument, I'd like to avoid a case statement.

Upvotes: 1

Views: 204

Answers (5)

SignorHarry
SignorHarry

Reputation: 44

Ok. If you looking for index 0 - you can use emials[0] or emails.at(0), or you can iterate emails - 

emails.each_with_index do |val, index| 
if index == 0
# something
end
end

It's all.

Upvotes: 0

Bartłomiej Gładys
Bartłomiej Gładys

Reputation: 4615

try each_with_index

emails.each_with_index do |email, index|

  if index == 0
    # do something
  end 

end

Upvotes: 2

Michael Kohl
Michael Kohl

Reputation: 66837

Like people said before, each_with_index is a good choice. However, if you want to start your index from anything else than 0, there's a better way (note that the dot is on purpose, we are calling Enumerator#with_index here):

emails.each.with_index(1) do |email, index|
  # ...
end

Upvotes: 1

iamsolankiamit
iamsolankiamit

Reputation: 37

You can use .each_with_index it will provide you the index of each element in the array.

for example

['a','b','c'].each_with_index {|item, index|
  puts "#{item} has index #{index}"
}

output

a has index 0
b has index 1
c has index 2

Upvotes: 0

peter
peter

Reputation: 42192

Like the others answered, if you need the enumeration:

emails.each.with_index([startindex]) do |email, index|

eg

emails.each.with_index(1) do |email, index|

But if you only need that element then you can act upon directly like this

emails.first

what is the same as 

emails[0]

Upvotes: 1

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