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Editorial Team
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Asked: 2026-05-28T22:11:15+00:00

Instead of invoking a function on each matching value, I’d like get the array

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Instead of invoking a function on each matching value, I’d like get the array of values ['broccoli', 'spinach'], but I keep getting compiler errors. Could someone explain what I’m misunderstanding?

# Health conscious meal.  - This example is from http://coffeescript.org/#loops
foods = ['broccoli', 'spinach', 'chocolate']
eat food for food in foods when food isnt 'chocolate'

# Failed Attempt #1 - Unexpected TERMINATOR
arr = for food in foods when food isnt 'chocolate'

# Failed Attempt #2 - Unexpected ')'
arr = (for food in foods when food isnt 'chocolate')
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1 Answer

  1. Editorial Team

    You’re missing the value that the comprehension is supposed to return (which is eat food in the original, but you want to return food unmodified). So instead of:

    for food in foods when food isnt 'chocolate'

    You want:

    food for food in foods when food isnt 'chocolate'

    (Though if you’re targeting modern JavaScript implementations, it would probably be more readable just to use something like foods.filter (food) -> food isnt 'chocolate'.)

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