Javascript : String split() Method only push unique char

Question

I think the title is self explanatory. Is it possible to only push the unique char from a string into the array using split() methode? Example : from string "javascript", I want an output array to be :

["j", "a", "v", "s", "c", "r", "i", "p", "t"]

Thank you!

possible duplicate of [How to get unique values in a array](http://stackoverflow.com/questions/11246758/how-to-get-unique-values-in-a-array) — Evan Trimboli, Dec 19 '13 at 10:50

gtournie · Answer 1 · 2013-12-19T10:49:51.023

2

'javascript'.split('') => ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't']

edited Dec 19 '13 at 10:49

answered Dec 19 '13 at 10:48

gtournie

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score 2 · Accepted Answer · answered Dec 19 '13 at 10:48

2

Like this:

'javascript'.split('').filter(function(value, index, self) { 
   return self.indexOf(value) === index;
 })

answered Dec 19 '13 at 10:48

CD..

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No, it will produce an array like this : ["j", "a", "v", "a", "s", "c", "r", "i", "p", "t"] I only want need one "a". – ishwr Dec 19 '13 at 10:49
@catwoman: This one works well. Result is: ["j", "a", "v", "s", "c", "r", "i", "p", "t"] – Synthetx Dec 19 '13 at 10:54

score 1 · Answer 3 · answered Dec 19 '13 at 10:51

1

Something like this?

var string = 'javascript';
var uniqueArr = [];
string.split('').forEach(function(e, i) {
    if (uniqueArr.indexOf(e) == -1) {
        uniqueArr.push(e)
    }
});

uniqueArr would contain all your 'unique char's

answered Dec 19 '13 at 10:51

tewathia

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Note that `indexOf` on arrays first was implemented in IE9 – h2ooooooo Dec 19 '13 at 10:53

score 1 · Answer 4 · answered Dec 19 '13 at 10:54

Use a hash array to remember chars have appeared.

function unqArr(str) {

    //char flag hash
    var unqHash = {};

    return str.split('').filter(function(c) {

        //this char has appeared
        if (unqHash[c])
            return false;

        //flag this char
        unqHash[c] = 1;
        return true;
    });
}

http://jsfiddle.net/rooseve/s92Jm/

Javascript : String split() Method only push unique char

4 Answers4