Create an array of object using a for loop in coffescript

Question

Quick question. I can't find the syntax for it (well assuming it exists) for creating an object from a for loop. What is the correct way to do this -

letters = ['a', 'b', 'c']
objs = (letter[index]:index for letter, index in letters)

#Also tryed..
objs = ({letter[index]:index} for letter, index in letters)

Any ideas?

Do you have any libraries? If you had Underscore or Lodash, you could _([e, i] for e, i in letters).object(). — mu is too short
– mu is too short, Commented Aug 20, 2013 at 23:10

Peter Lyons · Accepted Answer · 2013-08-20 21:05:02Z

2

coffee> letters = ['a', 'b', 'c']
[ 'a', 'b', 'c' ]
coffee> lettersToIndex = {}
{}
coffee> lettersToIndex[letter] = index for letter, index in letters
[ 0, 1, 2 ]
coffee> lettersToIndex
{ a: 0, b: 1, c: 2 }

answered Aug 20, 2013 at 21:05

Peter Lyons

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2 Comments

hpaulj Over a year ago

Python finally added dict comprehensions: {x: x**2 for x in (2, 4, 6)}. Wonder it that's been suggested for coffeescript?

epidemian Over a year ago

@hpaulj, yep, many times it seems: #14, #77, #216, and #467. Not a very useful feature when you have _.object.

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