Question

This coffeescript…

"""
#{@display_event_small(event) for event in data.top_events}
"""

outputs commas between each of the elements in data.top_events. I need to have them concatenate without commas in between. Of course, I could use a more customized loop, but I would imagine CoffeeScript has a nicer way of changing this behavior.

Let me know if I need to clarify. Thanks.

Answer 1

The loop expression results in an array so you could explicitly join the elements with an empty string delimiter:

"""
#{(@display_event_small(event) for event in data.top_events).join('')}
"""

There’s no special formatting options for "#{}", CoffeeScript just turns it inside out and hands it off to JavaScript’s +. An interpolated string like "a #{b} c" becomes

"a " + b + " c"

when compiled to JavaScript and JavaScript is inserting the commas when it stringifies your array.