JavaScript: Get the last element of an array
JavaScript Array: Exercise-4 with Solution
Write a JavaScript function to get the last element of an array. Passing a parameter 'n' will return the last 'n' elements of the array.
Test Data :
console.log(last([7, 9, 0, -2]));
console.log(last([7, 9, 0, -2],3));
console.log(last([7, 9, 0, -2],6));
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Get last and last n elements of an array</title>
</head>
<body>
</body>
</html>
JavaScript Code:
var last = function(array, n) {
if (array == null)
return void 0;
if (n == null)
return array[array.length - 1];
return array.slice(Math.max(array.length - n, 0));
};
console.log(last([7, 9, 0, -2]));
console.log(last([7, 9, 0, -2],3));
console.log(last([7, 9, 0, -2],6));
Sample Output:
-2 [9,0,-2] [7,9,0,-2]
Flowchart:
ES6 Version:
var last = function last(array, n) {
if (array == null) return void 0;
if (n == null) return array[array.length - 1];
return array.slice(Math.max(array.length - n, 0));
};
console.log(last([7, 9, 0, -2]));
console.log(last([7, 9, 0, -2], 3));
console.log(last([7, 9, 0, -2], 6));
Live Demo:
See the Pen JavaScript - Get the last element of an array- array-ex-4 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript function to get the first element of an array. Passing a parameter 'n' will return the first 'n' elements of the array.
Next: Write a simple JavaScript program to join all elements of the following array into a string.
What is the difficulty level of this exercise?
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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
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