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

JavaScript Basic: Exercise-80 with Solution

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]));

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