Coffeescript for loop

Question

I am trying to convert some apple chart examples from javascript to coffeescript. Having a tough time trying to figure out how to write this for loop in coffee script. Thanks for any help in advance

for (scale = maxVal; scale >= 0; scale -= stepSize) {...}

MojoFilter · Accepted Answer · 2015-10-08 21:20:54Z

28

This loop will increment by the negative of stepSize.

maxVal = 10
stepSize = 1
for scale in [maxVal..0] by -stepSize
  console.log scale

However, if stepSize is actually 1, then

maxVal = 10
for scale in [maxVal..0]
  console.log scale

would produce the same result

edited Oct 8, 2015 at 21:20

MojoFilter

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answered Dec 20, 2012 at 20:07

hexid

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2 Comments

mu is too short Over a year ago

You don't need (0-stepSize), just -stepSize should be sufficient.

Tino Over a year ago

use by 1 or by -1 if possible. CoffeeScript (I have version 1.10) creates extremely inefficient (and quite puzzling) code if it must figure this out at runtime.

ggorlen · Accepted Answer · 2021-07-07 19:00:49Z

10

scale = maxVal
while scale >= 0
  ...
  scale -= stepSize

There's a good tool for converting JS to Coffeescript: http://js2.coffee/

edited Jul 7, 2021 at 19:00

ggorlen

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answered Dec 20, 2012 at 19:21

Tolik Kukul

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1 Comment

tonyedwardspz Over a year ago

Thanks for posting that link. It's helped me out a few times in the last couple days :)

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