How to push a string into array

Question

I am matching a pattern and i need to split and push it into an array.

a = Array.new
doc = "<span>Hi welcome to world</span>"
len = doc.length
puts doc.scan(/o/)
a << doc.scan(/o/)
puts a.length

Output for the above code is

o
o
o
1

The length of array is 1

I want the length of array to be 3

Instead of pushing a complete string into an array. i want to push it as three different elements

Fyi. You pushed an array into array. So a has a second element which is the array produced from doc.scan(/o/). — ptierno
– ptierno, Commented Jan 13, 2015 at 9:29

Arup Rakshit · Accepted Answer · 2015-01-13 07:13:31Z

2

You need to use Array#concat method.

a = Array.new
doc = "<span>Hi welcome to world</span>"
len = doc.length
puts doc.scan(/o/)
a.concat doc.scan(/o/)
puts a.length # => 3

doc.scan(/o/) gives you ['o', 'o', 'o']. And a << doc.scan(/o/) gives you [['o', 'o', 'o']], not ['o', 'o', 'o']. That's why you are getting the size of a as 1.

What you want to achieve can be made using Array#concat. Because a.concat doc.scan(/o/) will give you exactly ['o', 'o', 'o'], and thus size of a is now 3.

But you could write it as:

doc = "<span>Hi welcome to world</span>"
len = doc.length
puts doc.scan(/o/)
a = doc.scan(/o/)
puts a.length # => 3

Looking at your this mini code a = Array.new is not needed.

edited Jan 13, 2015 at 7:13

answered Jan 13, 2015 at 7:08

Arup Rakshit

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3 Comments

shivam Over a year ago

also maybe simply a += doc.scan(/o/) ?

Arup Rakshit Over a year ago

@shivam It will create a new object.. :)

Stefan Over a year ago

You could also pass a block to scan: doc.scan(/o/) { |m| a << m }

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