Posted over 5 years ago. Visible to the public. Repeats.

You don't need each, collect or select in Coffeescript

Working with lists in Javascript is painful because the native Array class is so poorly designed.

One way to reduce the pain is to to use Underscore.js's functions like _.each, _.map or _.select, which unfortunately clutters your code with awkward calls to the _ helper.

Fortunately when you use CoffeeScript you don't need any of that. CoffeeScript has a very versatile for keyword that can do anything that each, collect or select can do. Enjoy!

each

Copy
for item in items ...

collect / map

Copy
ages = (person.age for person in people)

select / grep

Copy
adults = (person for person in people when person.age >= 18)

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Owner of this card:

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Henning Koch
Last edit:
10 months ago
by Tobias Kraze
Keywords:
list, comprehensions
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License for source code
Posted by Henning Koch to makandra dev
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