remove duplicate element of array with coffescript

Question

I have an array with elements duplicates:

data = ["Ruby on rails", "Ruby on rails", "Jquery", "Coffescript", "Javascript"]

I try to remove duplicate elements of array with

indexes = []
uniques = []
i = 0
while i < data.length
 if indexes[data[i].text] is "undefined"
  indexes[data[i].text] = "defined"
  uniques.push
i++
console.log data

But I get the same result with elements duplicates.

How can I fixed?

Thanks!

Short of me fixing your code for you I'd recommend a library like underscore.js it's great for this sort of thing. — Drew R
– Drew R, Commented Sep 27, 2013 at 14:26

Bergi · Accepted Answer · 2013-09-27 14:43:22Z

5

… is "undefined"

does get compiled to === "undefined", which is not what you want. Remove the quotes for not comparing against the string, but the undefined value.

Btw, your script should be

index = {}
uniques = []

for text in data
 unless (text of index)
  index[text] = true
  uniques.push(text)

or even a filter comprehension like

index = {}
uniques = for text in data when not (text of index)
 index[text] = true
 text

edited Sep 27, 2013 at 14:43

answered Sep 27, 2013 at 14:29

Bergi

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1 Comment

hyperrjas Over a year ago

If I remove the do "undefined" and add undefined from if indexes[data[i].text] is undefined I get [][][][][] Thanks!

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