JavaScript: Find the first not repeated character

JavaScript Function: Exercise-23 with Solution

Write a JavaScript function to find the first not repeated character.

Sample arguments : 'abacddbec'
Expected output : 'e'

Pictorial Presentation:

JavaScript: Find the first not repeated character
Sample Solution: -

HTML Code:

<!DOCTYPE html>
  <meta charset="utf-8">
  <title>find the first not repeated character.</title>


JavaScript Code:

function find_FirstNotRepeatedChar(str) {
  var arra1 = str.split('');
  var result = '';
  var ctr = 0;
  for (var x = 0; x < arra1.length; x++) {
    ctr = 0;
    for (var y = 0; y < arra1.length; y++) 
      if (arra1[x] === arra1[y]) {
        ctr+= 1;
    if (ctr < 2) {
      result = arra1[x];
  return result;

Sample Output:



Flowchart: JavaScript function: Find the first not repeated character

Live Demo:

See the Pen JavaScript - Find the first not repeated character-function-ex- 23 by w3resource (@w3resource) on CodePen.

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Previous: Write a JavaScript function that accepts two arguments, a string and a letter and the function will count the number of occurrences of the specified letter within the string.
Next: Write a JavaScript function to apply Bubble Sort algorithm.

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JavaScript: Tips of the Day

Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213