I try to solve this challenge :
Define a new instance method on the `Array` class called
second , which returns the second item in an array
(similar to the way .first and .last
work in Ruby).
So I did this :
class Array
def second
self.at(1)
end
end
With this test :
Test.assert_equals(4, Array.second([3,4,5]) )
but as soon as I try the test I see this error:
': undefined method `second' for Array:Class (NoMethodError)
Which I find wierd because I made that method.
Roelof
irb(main):138:0> class Array
irb(main):139:1>
irb(main):140:1* def second
irb(main):141:2> self.at(1)
irb(main):142:2> end
irb(main):143:1>
irb(main):144:1* end
=> :second
irb(main):145:0> %w[1 2 3].second
=> "2"
already created Arrays should have not your custom methods
Thread name: "why is the method not found."
Mail number: 1
In reply to: Roelof Wobben
···
Date: Fri, Dec 05, 2014
Hello,
I try to solve this challenge :
Define a new instance method on the Array class called second, which returns
the second item in an array (similar to the way .first and .last work in Ruby).
Define a new instance method on the Array class called second, which
returns the second item in an array (similar to the way .first and .last
work in Ruby).
The problem is with your test. You are calling it as a class method, not an instance method.
Try something like this instead?
Test.assert_equals(“4", %w(3 4 5).second )
···
—
Sent from Mailbox
On Fri, Dec 5, 2014 at 11:41 AM, Lázaro Armando <lazaro@hcg.sld.cu> wrote:
Create new arrays after modify the class
irb(main):138:0> class Array
irb(main):139:1>
irb(main):140:1* def second
irb(main):141:2> self.at(1)
irb(main):142:2> end
irb(main):143:1>
irb(main):144:1* end
=> :second
irb(main):145:0> %w[1 2 3].second
=> "2"
already created Arrays should have not your custom methods
Thread name: "why is the method not found."
Mail number: 1
Date: Fri, Dec 05, 2014
In reply to: Roelof Wobben
Hello,
I try to solve this challenge :
Define a new instance method on the Array class called second, which returns
the second item in an array (similar to the way .first and .last work in Ruby).
Can someone explain what the %w does.
Roelof
Raj Sahae schreef op 5-12-2014 20:48:
···
The problem is with your test. You are calling it as a
class method, not an instance method.
Try something like this instead?
Test.assert_equals(“4", %w(3 4 5).second )
—
Sent from [Mailbox](https://www.dropbox.com/mailbox)
On Fri, Dec 5, 2014 at 11:41 AM, Lázaro Armando lazaro@hcg.sld.cu > wrote:
Create new arrays after modify the class
irb(main):138:0> class Array
irb(main):139:1>
irb(main):140:1* def second
irb(main):141:2> self.at(1)
irb(main):142:2> end
irb(main):143:1>
irb(main):144:1* end
=> :second
irb(main):145:0> %w[1 2 3].second
=> "2"
already created Arrays should have not your custom methods
Thread name: "why is the method not found."
Mail number: 1
Date: Fri, Dec 05, 2014
In reply to: Roelof Wobben
>
> Hello,
>
> I try to solve this challenge :
>
> Define a new instance method on the Array class called
second, which returns
> the second item in an array (similar to the way .first
and .last work in Ruby).
>
> So I did this :
>
> class Array
>
> def second
> self.at(1)
> end
>
> end
>
> With this test :
>
> Test.assert_equals(4, Array.second([3,4,5]) )
>
> but as soon as I try the test I see this error:
>
> ': undefined method `second' for Array:Class
(NoMethodError)
>
> Which I find wierd because I made that method.
>
> Roelof
>
>
irb(main):147:0> ["uno","dos","tres"]==%w[uno dos tres]
=> true
easies writing an array
Thread name: "Re: why is the method not found."
Mail number: 5
In reply to: Roelof Wobben
···
Date: Fri, Dec 05, 2014
Thanks,
Can someone explain what the %w does.
Roelof
Raj Sahae schreef op 5-12-2014 20:48:
The problem is with your test. You are calling it as a class method, not an
instance method.
Try something like this instead?
Test.assert_equals(“4", %w(3 4 5).second )
—
Sent from Mailbox
On Fri, Dec 5, 2014 at 11:41 AM, Lázaro Armando <lazaro@hcg.sld.cu> wrote:
Create new arrays after modify the class
irb(main):138:0> class Array
irb(main):139:1>
irb(main):140:1* def second
irb(main):141:2> self.at(1)
irb(main):142:2> end
irb(main):143:1>
irb(main):144:1* end
=> :second
irb(main):145:0> %w[1 2 3].second
=> "2"
already created Arrays should have not your custom methods
Thread name: "why is the method not found."
Mail number: 1
Date: Fri, Dec 05, 2014
In reply to: Roelof Wobben
>
> Hello,
>
> I try to solve this challenge :
>
> Define a new instance method on the Array class called second, which
returns
> the second item in an array (similar to the way .first and .last work
in Ruby).
>
> So I did this :
>
> class Array
>
> def second
> self.at(1)
> end
>
> end
>
> With this test :
>
> Test.assert_equals(4, Array.second([3,4,5]) )
>
> but as soon as I try the test I see this error:
>
> ': undefined method `second' for Array:Class (NoMethodError)
>
> Which I find wierd because I made that method.
>
> Roelof
>
>
%w(a b c) is same as ["a", "b", "c"]. it is an easy way to define
array of words.
···
On Sat, Dec 6, 2014 at 1:35 AM, Roelof Wobben <r.wobben@home.nl> wrote:
Thanks,
Can someone explain what the %w does.
Roelof
Raj Sahae schreef op 5-12-2014 20:48:
The problem is with your test. You are calling it as a class method, not an
instance method.
Try something like this instead?
Test.assert_equals(“4", %w(3 4 5).second )
—
Sent from Mailbox
On Fri, Dec 5, 2014 at 11:41 AM, Lázaro Armando <lazaro@hcg.sld.cu> wrote:
Create new arrays after modify the class
irb(main):138:0> class Array
irb(main):139:1>
irb(main):140:1* def second
irb(main):141:2> self.at(1)
irb(main):142:2> end
irb(main):143:1>
irb(main):144:1* end
=> :second
irb(main):145:0> %w[1 2 3].second
=> "2"
already created Arrays should have not your custom methods
Thread name: "why is the method not found."
Mail number: 1
Date: Fri, Dec 05, 2014
In reply to: Roelof Wobben
>
> Hello,
>
> I try to solve this challenge :
>
> Define a new instance method on the Array class called second, which
> returns
> the second item in an array (similar to the way .first and .last work in
> Ruby).
>
> So I did this :
>
> class Array
>
> def second
> self.at(1)
> end
>
> end
>
> With this test :
>
> Test.assert_equals(4, Array.second([3,4,5]) )
>
> but as soon as I try the test I see this error:
>
> ': undefined method `second' for Array:Class (NoMethodError)
>
> Which I find wierd because I made that method.
>
> Roelof
>
>