JavaScript: Remove all characters from a given string that appear more than once
JavaScript Basic: Exercise-135 with Solution
Write a JavaScript program to remove all characters from a given string that appear more than once.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Remove all characters from a given string that appear more than once</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function remove_duplicate_cchars(str) {
var arr_char = str.split("");
var result_arr = [];
for (var i = 0; i < arr_char.length; i++) {
if (str.indexOf(arr_char[i]) === str.lastIndexOf(arr_char[i]))
result_arr.push(arr_char[i]);
}
return result_arr.join("");
}
console.log(remove_duplicate_cchars("abcdabc"));
console.log(remove_duplicate_cchars("python"));
console.log(remove_duplicate_cchars("abcabc"));
console.log(remove_duplicate_cchars("1365451"));
Sample Output:
d python 364
Flowchart:
ES6 Version:
function remove_duplicate_cchars(str) {
const arr_char = str.split("");
const result_arr = [];
for (let i = 0; i < arr_char.length; i++) {
if (str.indexOf(arr_char[i]) === str.lastIndexOf(arr_char[i]))
result_arr.push(arr_char[i]);
}
return result_arr.join("");
}
console.log(remove_duplicate_cchars("abcdabc"));
console.log(remove_duplicate_cchars("python"));
console.log(remove_duplicate_cchars("abcabc"));
console.log(remove_duplicate_cchars("1365451"));
Live Demo:
See the Pen javascript-basic-exercise-135 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript program to change the characters (lower case) in a string where a turns into z, b turns into y, c turns into x, ..., n turns into m, m turns into n, ..., z turns into a.
Next: Write a JavaScript program to replace the first digit in a string (should contains at least digit) with $ character.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework