30 JavaScript One-Liners to Turn You into a JavaScript Wizard

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Today, in this article, I want to share some powerful JavaScript one-liners with you. Using these one-liners can help you boost your productivity. In this article, I've compiled 30 practical code tricks, and I hope these code snippets are helpful to you.

1. Reverse a String

const reversedString = str => str.split('').reverse().join('');
reversedString("Hello World"); // dlroW olleH

2. Title Case a String

const titleCase = sentence => sentence.replace(/\b\w/g, char => char.toUpperCase());
titleCase("hello world"); // Hello World

3. Swap Values Between Variables

[a, b] = [b, a];

4. Convert Number to Boolean

const isTruthy = num => !!num;
isTruthy(0); // False

5. Get Unique Values from an Array

const uniqueArray = arr => [...new Set(arr)];
uniqueArray([5,5,2,2,2,4,2]); // [ 5, 2, 4 ]

6. Truncate a String

const truncateString = (str, maxLength) => (str.length > maxLength) ? `${str.slice(0, maxLength)}...` : str;
truncateString("Hello World", 8); // Hello Wo...

7. Deep Clone an Object

const deepClone = obj => JSON.parse(JSON.stringify(obj));

8. Find the Last Occurrence in an Array

const lastIndexOf = (arr, item) => arr.lastIndexOf(item);
lastIndexOf([5, 5, 4 , 2 , 3 , 4], 5); // 1

9. Merge Arrays

const mergeArrays = (...arrays) => [].concat(...arrays);
mergeArrays([5, 5, 4], [2 , 3 , 4]); // [5, 5, 4, 2, 3, 4]

10. Find the Longest Word in a Sentence

const longestWord = sentence => sentence.split(' ').reduce((longest, word) => word.length > longest.length ? word : longest, '');
longestWord("The quick brown fox jumped over the lazy dog"); // jumped

11. Generate a Number Range

const range = (start, end) => [...Array(end - start + 1)].map((_, i) => i + start);
range(5, 15); // [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]

12. Check if Object is Empty

const isEmptyObject = obj => Object.keys(obj).length === 0;
isEmptyObject({}); // true
isEmptyObject({ name: 'John' }); // false

13. Calculate the Average of Numbers

const average = arr => arr.reduce((acc, num) => acc + num, 0) / arr.length;
average([1, 2, 3, 4, 5, 6, 7, 8, 9]); // 5

14. Convert Object to Query Parameters

const objectToQueryParams = obj => Object.entries(obj).map(([key, val]) => `${encodeURIComponent(key)}=${encodeURIComponent(val)}`).join('&');
objectToQueryParams({ page: 2, limit: 10 }); // page=2&limit=10

15. Calculate the Factorial of a Number

const factorial = num => num <= 1 ? 1 : num * factorial(num - 1);
factorial(4); // 24

16. Count Vowels in a String

const countVowels = str => (str.match(/[aeiou]/gi) || []).length;
countVowels('The quick brown fox jumps over the lazy dog'); // 11

17. Check for Valid Email

const isValidEmail = email => /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/.test(email);
isValidEmail("example@email.com"); // true
isValidEmail("example"); // false

18. Remove Whitespaces from a String

const removeWhitespace = str => str.replace(/\s/g, '');
removeWhitespace("H el l o"); // Hello

19. Check for Leap Year

const isLeapYear = year => (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0);
isLeapYear(2023); // false
isLeapYear(2004); // true

20. Generate a Random String of a Specified Length

const generateRandomString = length => [...Array(length)].map(() => Math.random().toString(36)[2]).join('');
generateRandomString(8); // 4hq4zm7y

21. Copy Content to Clipboard

const copyToClipboard = content => navigator.clipboard.writeText(content);
copyToClipboard("Hello World");

22. Get Current Time in HH:MM:SS Format

const currentTime = () => new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false });
currentTime(); // 19:52:21

23. Check if a Number is Even

const isEven = num => num % 2 === 0;
isEven(1); // false
isEven(2); // true

24. Detect Dark Mode

const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
console.log(isDarkMode); // false

25. Scroll to the Top of the Page

const goToTop = () => window.scrollTo(0, 0);
goToTop();

26. Check for Valid Date

const isValidDate = date => date instanceof Date && !isNaN(date);
isValidDate(new Date("This is not date.")); // false
isValidDate(new Date("08-10-2023")); // true

27. Generate a Date Range

const generateDateRange = (startDate, endDate) => Array.from({ length: (endDate - startDate) / (24 * 60 * 60 * 1000) + 1 }, (_, index) => new Date(startDate.getTime() + index * 24 * 60 * 60 * 1000));
generateDateRange(new Date("2023-09-31"), new Date("2023-10-08")); // [Sun Oct 01 2023 05:30:00 GMT+0530 (India Standard Time), Mon Oct 02 2023 05:30:00 GMT+0530 (India Standard Time), Tue Oct 03 2023 05:30:00 GMT+

0530 (India Standard Time), Wed Oct 04 2023 05:30:00 GMT+0530 (India Standard Time), Thu Oct 05 2023 05:30:00 GMT+0530 (India Standard Time), Fri Oct 06 2023 05:30:00 GMT+0530 (India Standard Time), Sat Oct 07 2023 05:30:00 GMT+0530 (India Standard Time), Sun Oct 08 2023 05:30:00 GMT+0530 (India Standard Time)]

28. Calculate the Interval Between Two Dates

const dayDiff = (d1, d2) => Math.ceil(Math.abs(d1.getTime() - d2.getTime()) / 86400000);
dayDiff(new Date("2023-10-08"), new Date("1999-04-31")); // 8926

29. Find the Day of the Year

const dayInYear = d => Math.floor((d - new Date(d.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayInYear(new Date('2023/10/08')); // 281

30. Check if Arrays are Equal

const areArraysEqual = (arr1, arr2) => JSON.stringify(arr1) === JSON.stringify(arr2);
areArraysEqual([1, 2, 3], [4, 5, 6]); // false
areArraysEqual([1, 2, 3], [1, 2, 3]); // true

Conclusion

JavaScript one-liners are valuable tools that can simplify complex tasks and improve code readability. By understanding and leveraging these techniques, you not only demonstrate your proficiency but also showcase the ability to write efficient, clear, and maintainable code.

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