Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

JavaScript: Create a new string taking the first and last n characters from a given string

JavaScript Basic: Exercise-68 with Solution

Write a JavaScript program to create a new string taking the first and last n characters from a given string. The string length must be greater or equal to n.

Pictorial Presentation:

JavaScript: Create a new string taking the first and last n characters from a given string

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to create a new string using the first and last n characters from a given string. The string length must be greater or equal to n.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function two_string(str, n)
  {
    first_part = str.substring(0, n);
    last_part = str.substring(str.length - n);
    return first_part + last_part;
 }

console.log(two_string("JavaScript", 2));
console.log(two_string("JavaScript", 3));

Sample Output:

Japt
Javipt

Flowchart:

Flowchart: JavaScript - Create a new string taking the first and last n characters from a given string

ES6 Version:

function two_string(str, n)
  {
    first_part = str.substring(0, n);
    last_part = str.substring(str.length - n);
    return first_part + last_part;
 }

console.log(two_string("JavaScript", 2));
console.log(two_string("JavaScript", 3));

Live Demo:

See the Pen Create a new string taking the first and last n characters from a given string by w3resource (@w3resource) on CodePen.


Contribute your code and comments through Disqus.

Previous: Write a JavaScript program to create a new string from a given string, removing the first and last characters of the string if the first or last character are 'P'.
Next: Write a JavaScript program to compute the sum of three elements of a given array of integers of length 3.

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