How to get the index in an associative array loop coffeescript

Question

I've been looking for answers for quite some time now and none of what I've seen is right for my situation. Here is my code:

colors: 
    red : "255, 0, 0"
    blue : "24, 149, 207"
    green : "74, 165, 76"
    grey : "202, 202, 202"
    black : "0, 0, 0"
    yellow : "183, 118, 4"
    purple : "83, 74, 166"
    white : "255, 255, 255"


for color, rgb, index of colors
 console.log index

I know that it is not working and I've seen many post about a simple array with a loop that looks like that:

for color, index in colors
    console.log index

I'm wondering if there is a way to do something like that with associative array or if I have to create define an index variable like this:

index: 0
for color, rgb of colors
    console.log index
    index++

Yes, you have to do it yourself. CS's for ... of loop is just a JavaScript for ... in loop in disguise. An index option in the CS for ... in loop make sense because you're iterating over something inherently ordered; an index when iterating over an object makes less sense because objects are inherently unordered so the index has no useful relation to what you're iterating over. — mu is too short
– mu is too short, Commented May 27, 2014 at 0:25

Sebastian vom Meer · Accepted Answer · 2014-05-27 09:48:16Z

1

Not sure if I understand your problem correctly. Do you want to loop over all your colors? Then do it like this:

colors =
    red : "255, 0, 0"
    blue : "24, 149, 207"

index = 0
for color, rgb of colors
    console.log color
    console.log rgb
    console.log index
    index++

Note that you have to use colors = instead of colors: to define a variable.

edited May 27, 2014 at 9:48

answered May 26, 2014 at 15:14

Sebastian vom Meer

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3 Comments

MaxCloutier Over a year ago

I do have to loop on the colors, but I want to have an index for every colors, not only the key. I would like to be able to access a variable that increment on the loop... Example: red = 0, blue = 1, etc. Do I have to create that index myself or is there a way to have it automatically?

Sebastian vom Meer Over a year ago

An index doesn't really make sense here because the standard does not determine an object property order. You should add an index manually.

MaxCloutier Over a year ago

Thanks, thats what I wanted to know

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