Ruby Array Issue - can't convert String into Integer

Question

Can't understand what the issue with this

nameTag = "div[class='designer_about'] a"
designsTag = "li[class='span-2']"
pullTags = Array.new(nameTag, designsTag)

Error:

designers_list_mirraw.rb:8:in `initialize': can't convert String into Integer (TypeError)
from designers_list_mirraw.rb:8:in `new'
from designers_list_mirraw.rb:8:in `<main>'

I am new to ruby

Don't use Array.new. Use the ['array', 'literal']. Could this be the cause? — John Dvorak
– John Dvorak, Commented Jul 2, 2013 at 16:52
@JanDvorak thanks. It helped. But I saw the above method outhere tutorialspoint.com/ruby/ruby_arrays.htm — chirag7jain
– chirag7jain, Commented Jul 2, 2013 at 16:54
If your question has been answered you should accept the one you found most helpful. — Cary Swoveland
– Cary Swoveland, Commented Jan 11, 2014 at 22:45

Caprica Six · Accepted Answer · 2013-07-02 17:05:27Z

25

+300

As juanpastas mentions, Array::new(size,obj) expects a number and an object. You can see this in the tutorial you linked to:

names = Array.new(4, "mac")

names is now an array with "mac" four times.

If your intention is to create an array with these two items:

pullTags = Array.[nameTag, designsTag]
# which is equivalent to
pullTags = Array[nameTag, designsTag]
# which are the more verbose versions of
pullTags = [nameTag, designsTag]

See [](*args).

answered Jul 2, 2013 at 17:05

Caprica Six

1,50012 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Wand Maker · Accepted Answer · 2013-07-02 17:37:09Z

4

Ary.new(length, item) is for the time you need an array have same item duplicate for certain times. It's not Array.new(item, item). The first parameter represent the length of array you want.

In your case you should use:

name_tag = "div[class='designer_about'] a"
designs_tag = "li[class='span-2']"
pull_tags = [name_tag, designs_tag]

BTW, by Ruby's convention, snake_case_variable_name is more preferred then camelCaseVariabelName

edited Jul 2, 2013 at 17:37

Wand Maker

18.8k9 gold badges58 silver badges90 bronze badges

answered Jul 2, 2013 at 17:02

taiansu

2,7852 gold badges24 silver badges30 bronze badges

Comments

sites · Accepted Answer · 2013-07-02 16:57:15Z

3

See Array::new

It receives integer and then an object, or an Array too, so you could use:

Array.new(2,'some') => ['some','some']
Array.new(an_array_here)

answered Jul 2, 2013 at 16:57

sites

21.9k18 gold badges90 silver badges147 bronze badges

Comments

Todd A. Jacobs · Accepted Answer · 2013-07-02 17:05:29Z

2

Ways to Build Arrays

The confusion comes from the fact that there are many ways to build arrays in Ruby. A non-exhaustive list includes:

Calling Kernel#Array.
Calling Array#new.
Construct an Array with an array literal, e.g. [].

The semantics of each vary. The way you're doing it has the following signature:

Array#new(size=0, obj=nil)

which means the first argument is the size of the array, not an array element itself. Use a different invocation to achieve your desired results.

answered Jul 2, 2013 at 17:05

Todd A. Jacobs

85.1k15 gold badges147 silver badges209 bronze badges

Comments

SAIDI Belkacem · Accepted Answer · 2013-07-02 17:19:03Z

1

see the Array

nameTag = "div[class='designer_about'] a"
designsTag = "li[class='span-2']"

The new method can be called in this ways:

Array.new # => []
Array.new(2) # => [nil,nil]
Array.new(2,designsTag) # =>["li[class='span-2']", "li[class='span-2']"]

Or to add elements one by one you can use the push method:

[ 1, 2 ] << "c" << "d" << [ 3, 4 ] #=> [ 1, 2, "c", "d", [ 3, 4 ] ]

answered Jul 2, 2013 at 17:19

SAIDI Belkacem

3486 silver badges13 bronze badges

Comments

Ikhoon Eom · Accepted Answer · 2014-01-14 07:30:47Z

0

If you have string items, you can also use %W

> nameTag = "div[class='designer_about'] a"
# => "div[class='designer_about'] a" 
> designsTag = "li[class='span-2']"
# => "li[class='span-2']"
> %W(#{nameTag} #{designsTag}) 
# => ["div[class='designer_about'] a", "li[class='span-2']"]

Reference : http://www.zenspider.com/Languages/Ruby/QuickRef.html#arrays

answered Jan 14, 2014 at 7:30

Ikhoon Eom

1832 silver badges7 bronze badges

Collectives™ on Stack Overflow

Ruby Array Issue - can't convert String into Integer

6 Answers 6

Comments

Comments

Comments

Ways to Build Arrays

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

Comments

Comments

Comments

Ways to Build Arrays

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related