This content originally appeared on DEV Community and was authored by Kushyar Rashidzadeh
JavaScript is full of hidden gems. Many times, we end up writing long functions for tasks that can actually be solved in just a single line of code.
Here are 10 clever JavaScript one-liners that can simplify your code and speed up your workflow.
1. Reverse a String
Split the string into an array, reverse it, and join it back together.
2. Check if a String is a Palindrome
Compares the string with its reversed version.
3. Get a Random Number Between Two Values
Generates a random integer between min and max.
4. Shuffle an Array
Uses the array sort() method with a random comparator.
5. Get Unique Values from an Array
Set automatically removes duplicates.
6. Flatten a Nested Array
The flat() method with Infinity flattens arrays of any depth.
7. Capitalize the First Letter of a String
Quick way to make titles and labels look nice.
8. Get Query Parameters from a URL
Turns query parameters into a clean object.
9. Check if a Number is Even
Simple modulus check — quick and clean.
10. Generate a Random Hex Color
Handy for generating random colors for backgrounds or UI elements.
🎯 Conclusion
These one-liners show how powerful and concise JavaScript can be. Instead of writing 5–10 lines, you can often solve problems in just one line.
👉 Which one was your favorite? Do you know other cool one-liners?
Drop them in the comments — let’s build a collection together!
If you found this useful, follow me for more JavaScript, React, and Next.js tips 🚀
This content originally appeared on DEV Community and was authored by Kushyar Rashidzadeh
Kushyar Rashidzadeh | Sciencx (2025-09-25T18:58:26+00:00) 10 JavaScript One-Liners Every Developer Should Know (2025 Edition). Retrieved from https://www.scien.cx/2025/09/25/10-javascript-one-liners-every-developer-should-know-2025-edition/
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