CODEWITHSUNDEEP
arrayscoffeescript
mirelon
mirelon

Reputation: 4996

Checking if an array has some items in coffeescript

Is there some method in coffeescript that returns true when an array has some items in it? Like method in ruby present?:

[].present? false
[1].present? true

According to http://arcturo.github.com/library/coffeescript/07_the_bad_parts.html an array emptiness in coffeescript is determined by its length

alert("Empty Array")  unless [].length

that seems so lame to me.

Upvotes: 13

Views: 17800

Answers (3)

Ashish Singh
Ashish Singh

Reputation: 759

I think using in works as well.

arr = [1, 2, 3, 4, 5]
a = 1
if a in arr
  console.log 'present'
else
  console.log 'not present'

Output
$ present

Upvotes: 0

Jiří Pospíšil
Jiří Pospíšil

Reputation: 14412

I don't think there is but can be:

Array::present = ->
  @.length > 0

if [42].present()
  # why yes of course
else
  # oh noes

A very simple and incomplete implementation but it should give you some ideas. And for the record, there's no present? method in Ruby, the method is added by the active_support gem.

Upvotes: 23

Michal Miškerník
Michal Miškerník

Reputation: 153

Unfortunately, there isn't. The best way to do it is by comparing its length.

Upvotes: 6

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