JavaScript: Create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1

JavaScript Basic: Exercise-76 with Solution

Create Array with First/Last Elements from Array

Write a JavaScript program to create an array by taking the first and last elements from a given array of integers. The length must be larger than or equal to 1.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function that returns an array containing the first and last elements of the input array
function started(nums) {
    var array1 = []; // Create an empty array to store the first and last elements
    array1.push(nums[0], nums[nums.length - 1]); // Add the first and last elements to the array
    return array1; // Return the array with the first and last elements
}
// Example usage of the started function with different input arrays
console.log(started([20, 20, 30])); // Output: [20, 30]
console.log(started([5, 2, 7, 8])); // Output: [5, 8]
console.log(started([17, 12, 34, 78])); // Output: [17, 78]

Output:

[20,30]
[5,8]
[17,78]

Live Demo:

See the Pen JavaScript - Create a new array taking the first and last elements from a given array of integers - basic-ex-76 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Function that returns an array containing the first and last elements of the input array
function started(nums) {
    var array1 = []; // Create an empty array to store the first and last elements
    array1.push(nums[0], nums[nums.length - 1]); // Add the first and last elements to the array
    return array1; // Return the array with the first and last elements
}
// Example usage of the started function with different input arrays
console.log(started([20, 20, 30])); // Output: [20, 30]
console.log(started([5, 2, 7, 8])); // Output: [5, 8]
console.log(started([17, 12, 34, 78])); // Output: [17, 78]

For more Practice: Solve these Related Problems:

• Write a JavaScript program that forms a new array by extracting the first and last elements from a given array of integers.
• Write a JavaScript function that validates an array’s length and returns an array containing only its first and last items.
• Write a JavaScript program that retrieves the boundary elements of an array and outputs them in a new array, handling arrays with one element gracefully.

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