JavaScript: Extract unique characters from a string

JavaScript Function: Exercise-16 with Solution

Write a JavaScript function to extract unique characters from a string.

Example string : "thequickbrownfoxjumpsoverthelazydog"
Expected Output : "thequickbrownfxjmpsvlazydg"

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Extract unique character from a string - w3resource</title>


JavaScript Code:

function unique_char(str1)
 var str=str1;
 var uniql="";
 for (var x=0;x < str.length;x++)

  uniql += str[x];  
  return uniql;  

Sample Output:



Flowchart: JavaScript function: Extract unique characters from a strin

Live Demo:

See the Pen JavaScript - Extract unique characters from a string-function-ex- 16 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript function to get the number of occurrences of each letter in specified string.

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JavaScript: Tips of the Day

Converts a given string into an array of words


const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
console.log(words('I love javaScript!!')); // ["I", "love", "javaScript"]
console.log(words('python, javaScript & coffee')); // ["python", "javaScript", "coffee"] 


["I", "love", "javaScript"]
["python", "javaScript", "coffee"]