Coffeescript . for/in loop

Question

Anybody knows if it is possible to get a

javascript for/in loop

from coffeescript?

Actually would like to write the js function

function logobject(o) {
   for (p in o)
     console.log(p + "=" + o[p])
}

in coffeescript.

Not a coffee-script programmer, but shouldn't it work just as it is? — gdoron
– gdoron, Commented Jun 14, 2012 at 21:57
No, coffeescript has other loops that it converts to js loops. usually in a convenient way. — citykid
– citykid, Commented Jun 14, 2012 at 21:58

Pickels · Accepted Answer · 2012-06-14 21:58:59Z

32

console.log "#{k}=#{v}" for k, v of o

answered Jun 14, 2012 at 21:58

Pickels

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Comments

Niko · Accepted Answer · 2012-06-17 18:25:48Z

28

This might be a bit confusing for CoffeeScript newbies, but the for..in loop is used to iterate over arrays, while the for..of loop is used to iterate over objects.

logobject = (o) ->
  console.log key + "=" + value for key, value of o

Also, to restrict this to own properties of the object (skips inherited properties via hasOwnProperty()), the "own" keyword can be added:

for own key, value of o

edited Jun 17, 2012 at 18:25

answered Jun 14, 2012 at 21:58

Niko

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2 Comments

citykid Over a year ago

right, and now i even find it in the dense docu, thx a lot, both helpful

Tony Brix Over a year ago

That is kind of crazy since js is kind of the opposite. For...in is for objects and For...of is for arrays (iterables)

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