Posted about 6 years ago. Visible to the public.
Looping through iterators in Coffeescript
Some modern Javascript APIs return iterators Archive instead of arrays.
In plain Javascript you can loop through an iterator using
for...of
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:
Copyvar iterator = ...; for (var value of iterator) { console.log(value); }
While there is a for...of
construct in Coffeescript, it
iterates through property/value pairs
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and cannot be used to access iterable objects.
To iterate through an iterator in Coffeescript you need to do something like this:
Copyiterator = ...; while (entry = iterator.next()) && !entry.done console.log(entry.value)
The parentheses in the while
cannot be omitted.
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