JavaScript: Swap the first and last elements of a given array of integers

JavaScript Basic: Exercise-80 with Solution

Swap First and Last Elements in Array

Write a JavaScript program to swap the first and last elements of a given array of integers. The array length should be at least 1.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to swap the first and last elements of an array
function swap(arra) {
    // Destructuring assignment to swap values without using a temporary variable
    [arra[0], arra[arra.length - 1]] = [arra[arra.length - 1], arra[0]];
    // Return the modified array
    return arra;
}

// Example usage
console.log(swap([1, 2, 3, 4]));
console.log(swap([0, 2, 1]));
console.log(swap([3])); 

Output:

[4,2,3,1]
[1,2,0]
[3]

Live Demo:

See the Pen JavaScript - swap the first and last elements of a given array of integers - basic-ex-80 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// ES6 version using array destructuring and swapping
const swap = (arra) => {
    [arra[0], arra[arra.length - 1]] = [arra[arra.length - 1], arra[0]];
    return arra;
};

// Example usage
console.log(swap([1, 2, 3, 4]));
console.log(swap([0, 2, 1]));
console.log(swap([3]));

For more Practice: Solve these Related Problems:

• Write a JavaScript program that swaps the first and last elements of an array and returns the updated array.
• Write a JavaScript function that performs an in-place swap of an array’s first and last elements, handling arrays with a single element correctly.
• Write a JavaScript program that checks if an array has at least one element before swapping its first and last items without using a temporary variable.

Go to:

• JavaScript basic Exercises Home ↩
• JavaScript Exercises Home ↩

PREV : Check if Array Contains 30 and 40 Twice.
NEXT : Add Two Digits in a Two-Digit Number.

Improve this sample solution and post your code through Disqus.