Scan for duplicate values in a string and remove them

Question

I am attempting to scan through and remove any duplicates from a string.

Here is an example scenario:

var str = "Z80.8, Z70.0, Z80.8";

The goal is to pass str into a function and have it returned as "Z80.8, Z70.0"

The string is separated by commas.

split by comma than https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates — epascarello, Feb 05 '19 at 15:11
Possible duplicate of [Remove occurrences of duplicate words in a string](https://stackoverflow.com/questions/16843991/remove-occurrences-of-duplicate-words-in-a-string) — Nik, Feb 05 '19 at 15:14

score 4 · Accepted Answer · answered Feb 05 '19 at 15:16

Use something like:

str
  .split(',')
  .map(function(s) { return s.trim() })
  .filter(function(v, i, a) { return a.indexOf(v) === i })
  .join(', ');

Split will make it an array by splitting the string at every comma.
Map will remove leading and trailing spaces.
Filter will remove any element that is already in the array.
Join will join back the array to one string.

score 1 · Answer 2 · answered Feb 05 '19 at 15:14

1

Use regex to get each value and then use Set to remove duplicates.

const data = "Z80.8, Z70.0, Z80.8";

const res = [...new Set(data.match(/\w+\.[0-9]/g))];

console.log(res);

answered Feb 05 '19 at 15:14

kemicofa ghost

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score 1 · Answer 3 · edited Feb 05 '19 at 16:09

1

Javascript code splits the string on ", " then defines an anonymous function passed to filter, that takes three parameters representing the item, index and allitems. The anonymous function returns true if the index of this item is the same as the first index of that item found, otherwise false. Then join the elements of the Arrray on comma.

var str = "Z80.8, Z70.0, Z80.8";
var res = str.split(", ").filter(function(item,index,allItems){
    return index == allItems.indexOf(item);
}).join(', ');

console.log(res);

Result:

Z80.8, Z70.0

edited Feb 05 '19 at 16:09

Eric Leschinski

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answered Feb 05 '19 at 15:17

Emircan Ok

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I'm sorry. Thank you. – Emircan Ok Feb 06 '19 at 08:07

score 0 · Answer 4 · answered Feb 05 '19 at 15:15

0

Try this:

let str = "Z80.8, Z70.0, Z80.8";
str = [...new Set(str.split(", "))].join(", ");
console.log(str);

answered Feb 05 '19 at 15:15

Leo

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Maheer Ali · Answer 5 · 2019-02-05T15:24:23.043

0

You can convert string to array using split() and then convert it to Set and then again join() it

var str = "Z80.8, Z70.0, Z80.8";
str = [... new Set(str.split(', '))].join(', ')
console.log(str);

edited Feb 05 '19 at 15:24

answered Feb 05 '19 at 15:16

Maheer Ali

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score 0 · Answer 6 · answered Feb 05 '19 at 15:17

0

let str = "Z80.8, Z70.0, Z80.8";
let uniq = [...new Set(str.split(", "))].join(", ");

answered Feb 05 '19 at 15:17

Clyde Lobo

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oma · Answer 7 · 2019-02-05T15:15:25.573

-1

I suggest to split this into an array then remove duplicates.

var arr = str.replace(" ", "").split(","); var uniqueArray = arr.filter((v, i, arr) => arr.indexOf(v) === i);

edited Feb 05 '19 at 15:15

answered Feb 05 '19 at 15:12

oma

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Scan for duplicate values in a string and remove them

7 Answers7