JavaScript: Create a new string from a given string with the first character of the given string added at the front and back
JavaScript Basic: Exercise-24 with Solution
Write a JavaScript program to create another string from a given string with the first character of the given string added to the front and back.
This JavaScript program creates a new string by adding the first character of the given string to both the front and back. It retrieves the first character using charAt(0) or substring() function and then concatenates it with the original string twice, once at the beginning and once at the end, to form the new string.
Visual Presentation:
Sample Solution:
JavaScript Code:
// Define a function named front_back that takes a parameter str
function front_back(str) {
// Extract the first character of str
first = str.substring(0, 1);
// Return the concatenation of first, str, and first
return first + str + first;
}
// Log the result of calling the front_back function with the argument 'a' to the console
console.log(front_back('a'));
// Log the result of calling the front_back function with the argument 'ab' to the console
console.log(front_back('ab'));
// Log the result of calling the front_back function with the argument 'abc' to the console
console.log(front_back('abc'));
Output:
aaa aaba aabca
Live Demo:
See the Pen JavaScript: string added at the front and back: basic-ex-24 by w3resource (@w3resource) on CodePen.
Flowchart:
ES6 Version:
// Using ES6 arrow function syntax to define the front_back function
const front_back = (str) => {
// Extract the first character of str
const first = str.substring(0, 1);
// Return the concatenation of first, str, and first
return first + str + first;
};
// Log the result of calling the front_back function with the argument 'a' to the console
console.log(front_back('a'));
// Log the result of calling the front_back function with the argument 'ab' to the console
console.log(front_back('ab'));
// Log the result of calling the front_back function with the argument 'abc' to the console
console.log(front_back('abc'));
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