Is it possible to remove duplicated values in a string?
e.g: aaa, bbb, ccc, ddd, bbb, ccc, eee, fff, ggg
the expected output be like: aaa, bbb, ccc, ddd, eee, fff, ggg
I have no idea how should I achieve on this.
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@SandeepNayak stringDamon– Damon2017-01-06 07:47:42 +00:00Commented Jan 6, 2017 at 7:47
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Can you show what you have tried so far?Peter Smith– Peter Smith2017-01-06 07:49:17 +00:00Commented Jan 6, 2017 at 7:49
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@PeterSmith to be fair i haven't tried much yet, because i'm kind of new to JS and like i said above, i have no idea how to go on itDamon– Damon2017-01-06 07:50:39 +00:00Commented Jan 6, 2017 at 7:50
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3 Answers
EcmaScript5 solution using String.prototype.match() and Array.prototype.filter() functions:
var str = 'aaa, bbb, ccc, ddd, bbb, ccc, eee, fff, ggg',
unique_items = str.match(/\b\w+\b/g).filter(function (el, idx, a) {
return idx === a.lastIndexOf(el);
});
// unique_items.sort(); // to get a sorted list of words(alphabetically)
console.log(unique_items);
// back to string
console.log(unique_items.join(', '));It will also cover such sophisticated input strings as 'aaa, bbb,, ccc, ddd, bbb, ccc? eee,, fff, ggg,,'
2 Comments
Damon
is it just because it's the console.log or will the [] and "" appear in the output?
RomanPerekhrest
@Damon, pay attention, the answer gives the expected output, no empty strings
Using Reduce Function with out disturb the existing order
var names = ["No","Speaking","Guy","No","Test","Solutions","No"];
var uniq = names.reduce(function(a,b){
if (a.indexOf(b) < 0 ) a.push(b);
return a;
},[]);
console.log(uniq, names) // [ 'No', 'Speaking', 'Guy', 'Test', 'Solutions' ]
// one liner
return names.reduce(function(a,b){if(a.indexOf(b)<0)a.push(b);return a;},[]);
Comments
Split the string at the commas and then put the result array in a Set. The set object is like an array, but it only stores 1 of each value.
var set = new Set(yourString.split(","));
var distinctValues = Array.from(set).join();
