I have an array:
int_array = [11,12]
I need to convert it into
str_array = ['11','12']
I'm new to this technology
-
possible duplicate of Apply method to array elementsAndrew Grimm– Andrew Grimm2011-12-12 21:59:24 +00:00Commented Dec 12, 2011 at 21:59
Add a comment
|
7 Answers
str_array = int_array.map(&:to_s)
4 Comments
srboisvert
How are you checking the type of your output?
user1658296
What is the meaning of the &: ?
gtd
@user1658296 this is a ruby idiom (built-in as of Ruby 1.9, or in Rails for < 1.8) that expands to a block of the form: { |el| el.send(:to_s) }
str_array = int_array.collect{|i| i.to_s}
2 Comments
Garth
This didn't work for me until I remembered that to do it in place in the array you have to call collect! instead of collect. Then it worked fine.
Rob
shorter to write it this way:
str_array = int_array.map(&:to_s) the "&:" means call the "to_s" method on every element of the array. and "map" is a shorter synonym for "collect"array.map(&:to_s) => array of integers into an array of strings
array.map(&:to_i) => array of strings into an array of integers
Comments
map and collect functions will work the same here.
int_array = [1, 2, 3]
str_array = int_array.map { |i| i.to_s }
=> str_array = ['1', '2', '3']
You can acheive this with one line:
array = [1, 2, 3]
array.map! { |i| i.to_s }
and you can use a really cool shortcut for proc: (https://stackoverflow.com/a/1961118/2257912)
array = [1, 2, 3]
array.map!(&:to_s)
Comments
Start up irb
irb(main):001:0> int_array = [11,12]
=> [11, 12]
irb(main):002:0> str_array = int_array.collect{|i| i.to_s}
=> ["11", "12"]
Your problem is probably somewhere else. Perhaps a scope confusion?
Comments
the shortest option:
int_array.map!(&:to_s)
Comments
Returns Int
x = [1,2,3,4,5,6,7,8,9,10] # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Returns String
y = 1,2,3,4,5 # => ["1", "2", "3", "4", "5"]
