CODEWITHSUNDEEP
ruby-on-railsruby
user3706202
user3706202

Reputation: 215

Method with if statement with syntax error

I'm doing some Ruby excercises. My goal is to create a method which reproduces the first and last number of an array.

My way of thinking was:

#create array
a = [1,2,3,4]
#create method
def lastFirst
   return a[0,3]
end
#call the method with an array
lastFirst(a)

But this produces [1,2,3] instead of what I want, which is (1,3).

Any thoughts on what I'm doing wrong?

Upvotes: 0

Views: 51

Answers (2)

shirakia
shirakia

Reputation: 2409

a[0,3]

　means get 3 elements starting from offset 0.

Try this:

def lastFirst(a)
  [a.first, a.last]
end

Upvotes: 5

Arup Rakshit
Arup Rakshit

Reputation: 118299

Write it using the Array#values_at method:

#create array
a = [1,2,3,4]
#create method
def last_first(a)
  a.values_at(0, -1)
end
#call the method
last_first(a) # => [1, 4]

Upvotes: 4

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