Coffeescript, array length undefined

Question

Could anyone explain me why the length is always null?

jsCountries = 
  0:
    country: "Brazil"
    photo:  "source.png"


alert jsCountries.length

robkuz · Accepted Answer · 2013-04-01 13:12:00Z

9

I dont know exactly what you want to do. If you want to use your code than the access would be

Object.keys(jsCountries).length

If however your intention is to create an array of country objects than I would suggest to initialize your jsCountries var differently

jsCountries = [
   {country: "Brazil", photo:  "source.png"},
   {country: "Argentina", photo:  "aregentina_source.png"},
   ...
]

Then of the following will work

jsCountries.length

In anyway I would strongly suggest not to use numeric keys for an object even thou its possible.

answered Apr 1, 2013 at 13:12

robkuz

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1 Comment

Thank you for your help. i've used finally: jsCountries = [ { country: "Albania", photo: "svg.png" } ]

phenomnomnominal · Accepted Answer · 2013-04-01 09:35:34Z

6

You are declaring an object, with the property 0 set, not an Array.

You want:

jsCountries = [
  country: "Brazil"
  photo:  "source.png"
]

alert jsCountries.length

answered Apr 1, 2013 at 9:35

phenomnomnominal

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