20 Essential JavaScript Hacks and Tricks
This article presents a curated list of twenty practical JavaScript hacks—including array initialization, sorting, logical operators, spread/rest, optional chaining, and more—demonstrating how modern ES6+ features can reduce code size, boost performance, and simplify common programming tasks.
In everyday development we often write functions for sorting, searching, finding unique values, swapping, and more; this article compiles a list of twenty JavaScript hacks that showcase concise, high‑performance solutions.
JavaScript is a fantastic language worth learning; for many problems there are multiple approaches, and this article focuses on the fastest ones.
These methods can help you reduce lines of code, excel in coding contests, hackathons, or any time‑boxed tasks.
Most of the JavaScript hacks use ECMAScript 6 (ES2015) and later features, even though the latest version is ECMAScript 11 (ES2020).
Note: Click the "Read original" link at the bottom left to view the corresponding twenty code examples (all tested in Google Chrome’s console).
1. Declare and initialize arrays
2. Find sum, minimum, and maximum
3. Sort arrays of strings, numbers, or objects
4. Filter out falsy values from an array
5. Use logical operators for various conditions
6. Remove duplicate values
7. Create counter objects or maps
8. Ternary operator tricks
9. Faster for‑loop compared to older loops
10. Merge two objects
11. Arrow functions
12. Optional chaining
13. Shuffle an array
14. Nullish coalescing operator
15. Rest & spread operators
16. Default parameters
17. Convert decimal to binary or hexadecimal
18. Simple value swap using destructuring
19. One‑line palindrome check
20. Convert object properties to an array
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