Adding Characters to each object in Array

Question

I have an array of characters:

'1','2','3','4','5','6','7','8','9'

That I need to transform into:

'(1)','(2)','(3)','(4)','(5)','(6)','(7)','(8)','(9)'

I recall there is a function to do so in coffeescript but cannot locate where or how it was defined.

How can I efficiently append opening and closing parenthesis to each object in the array?

Use simple loop or map function for functional programming look. — Alexander R.
– Alexander R., Commented Mar 28, 2015 at 0:52
It's not clear what you're trying to do, especially with this wierd syntax to define arrays. Are you truing to add '(' and ')' character to the beginning and to the end of each string in an array? — Leonid Beschastny
– Leonid Beschastny, Commented Mar 28, 2015 at 0:54
Don't forget you can express your array as 1..9, assuming that's your actual code. — Cheezmeister
– Cheezmeister, Commented Mar 30, 2015 at 9:25
@Cheezmeister I'm sorry, it's not, I just used that for an example — Sauron
– Sauron, Commented Mar 30, 2015 at 13:13

Leonid Beschastny · Accepted Answer · 2015-03-28 01:01:31Z

1

Just as Alexander Ravikovich mentioned in comments, you could do it using either a loop:

arr = ['1', '2', '3']

new_arr = ("(#{s})" for s in arr)
# => [ '(1)', '(2)', '(3)' ]

new_arr = arr.map (s) -> "(#{s})"
# => [ '(1)', '(2)', '(3)' ]

Note that I used CS string Interpolation to simplify my code.

answered Mar 28, 2015 at 1:01

Leonid Beschastny

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2 Comments

Where can I test this in the browser? Like js fiddle but for coffeescript