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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

Write a JavaScript program to 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.

Pictorial Presentation:

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.

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 array taking the first and last elements from a given array of integers and length must be greater or equal to 1.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function started(nums) {
     var array1 = [];
     array1.push(nums[0], nums[nums.length - 1]);

     return array1;
}
console.log(started([20, 20, 30]));
console.log(started([5, 2, 7, 8]));
console.log(started([17, 12, 34, 78]));

Sample Output:

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

Flowchart:

Flowchart: 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

ES6 Version:

function started(nums) {
     const array1 = [];
     array1.push(nums[0], nums[nums.length - 1]);

     return array1;
}
console.log(started([20, 20, 30]));
console.log(started([5, 2, 7, 8]));
console.log(started([17, 12, 34, 78]));

Live Demo:

See the Pen JavaScript - Create a new array taking the middle elements of the two arrays of integer and each length 3 - basic-ex-75 by w3resource (@w3resource) on CodePen.


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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