JavaScript: Detect whether the website is being opened in a mobile device or a desktop/laptop
JavaScript fundamental (ES6 Syntax): Exercise-72 with Solution
Write a JavaScript program to detect whether the website is being opened in a mobile device or a desktop/laptop.
- Use a regular expression to test the navigator.userAgent property to figure out if the device is a mobile device or a desktop.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const detectDeviceType = () =>
/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
? 'Mobile'
: 'Desktop';
console.log(detectDeviceType()); // "Mobile" or "Desktop"
Sample Output:
Desktop
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-72-1 by w3resource (@w3resource) on CodePen.
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Next: Write a JavaScript program to return the difference between two arrays, after applying the provided function to each array element of both.
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JavaScript: Tips of the Day
Returns the unique symmetric difference between two arrays, not containing duplicate values from either array
Example:
const uniqueSymmetricDifference = (a, b) => [ ...new Set([...a.filter(v => !b.includes(v)), ...b.filter(v => !a.includes(v))]) ]; console.log(uniqueSymmetricDifference([1, 2, 3], [1, 2, 4])); // [3, 4] console.log(uniqueSymmetricDifference([1, 2, 2], [1, 3, 1])); // [2, 3]
Output:
[3, 4] [2, 3]
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