🚀 Supercharge Your JavaScript Skills with These One-Liners!
Hello Devs! Welcome back to another article,
As JavaScript continues to evolve, staying updated with concise and efficient coding techniques is essential. Whether you’re a seasoned developer or just beginning your journey, mastering these JavaScript one-liners will significantly enhance your productivity.
In this article, you’ll discover powerful JavaScript snippets that will help you write cleaner, faster, and more efficient code in 2025. Let’s dive in!
Array Manipulations
1. Find the Maximum Value in an Array
Math.max(...array);Uses the spread operator to pass elements as arguments to Math.max().
2. Remove Duplicates from an Array
[...new Set(array)];Converts the array to a Set (which removes duplicates) and back to an array.
3. Flatten a Nested Array
const flatten = (arr) => arr.flat(Infinity);Flattens an array to any depth using flat(Infinity).
4. Get a Random Element from an Array
const randomElement = (arr) => arr[Math.floor(Math.random() * arr.length)];Selects a random element from an array.
5. Get the Last Item of an Array
const lastItem = (arr) => arr.at(-1);Uses .at(-1) for cleaner syntax to get the last element.
6. Get the First N Elements of an Array
const firstN = (arr, n) => arr.slice(0, n);Extracts the first n elements from an array.
Object Utilities
7. Check if an Object is Empty
const isEmptyObject = (obj) => Object.keys(obj).length === 0;Returns true if the object has no properties.
8. Merge Multiple Objects
const mergeObjects = (...objs) => Object.assign({}, ...objs);Combines multiple objects into one.
9. Deep Clone an Object
const clone = (obj) => structuredClone(obj);Uses the built-in structuredClone() method for deep cloning.
10. Convert an Object to an Array
const objToArray = (obj) => Object.entries(obj);Turns an object into an array of key-value pairs.
11. Get Unique Elements from an Array of Objects (by Property)
const uniqueBy = (arr, key) => [...new Map(arr.map(item => [item[key], item])).values()];Filters unique objects based on a specific property.
String Operations
12. Capitalize the First Letter of a String
const capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1);Capitalizes only the first letter while keeping the rest unchanged.
13. Convert a String to a Slug
const slugify = (str) => str.toLowerCase().trim().replace(/\s+/g, '-');Replaces spaces with hyphens and ensures lowercase formatting.
14. Reverse a String
const reverseString = (str) => [...str].reverse().join('');Splits the string into an array, reverses it, and joins it back.
15. Count Occurrences of a Character in a String
const countChar = (str, char) => str.split(char).length - 1;Counts how many times a specific character appears in a string.
16. Check if a String Contains a Substring (Case Insensitive)
const containsIgnoreCase = (str, substr) => str.toLowerCase().includes(substr.toLowerCase());Performs a case-insensitive substring check.
17. Generate a Random Alphanumeric String
const randomAlphaNum = (length) => [...Array(length)].map(() => (Math.random().toString(36)[2])).join('');Generates a random alphanumeric string of a given length.
Utility Functions
18. Get the Current Timestamp
Date.now();Returns the current timestamp in milliseconds.
19. Check if a Variable is an Array
Array.isArray(variable);Returns true if the variable is an array.
20. Convert Query Parameters to an Object
const parseQuery = (url) => Object.fromEntries(new URL(url).searchParams);Parses query parameters from a URL into an object.
21. Format a Date in YYYY-MM-DD Format
const formatDate = (date) => date.toISOString().split('T')[0];Extracts the date portion from an ISO date string.
22. Shorten an Array by Removing Falsy Values
const cleanArray = (arr) => arr.filter(Boolean);Removes false, 0, null, undefined, NaN, and "" from an array.
Randomization & Color Utilities
23. Generate a Random Integer Between Two Values (Inclusive)
const randomBetween = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;Efficiently generates a random number within the specified range.
24. Generate a Random HEX Color
const randomHexColor = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padStart(6, '0')}`;Generates a random hexadecimal color code.
25. Convert RGB to HEX
const rgbToHex = (r, g, b) => `#${((1 << 24) | (r << 16) | (g << 8) | b).toString(16).slice(1)}`;Converts RGB values to a HEX color code.
26. Generate a UUID (Version 4)
const uuid = () => crypto.randomUUID();Uses the built-in crypto module to generate a unique identifier.
Final Thoughts
Mastering these JavaScript one-liners will make your code cleaner, more efficient, and easier to maintain. Whether you’re optimizing performance or improving readability, these techniques will save you time and effort in 2025.
Do you have a favorite one-liner that’s not on this list? Share it in the comments below! And if you found this helpful, don’t forget to follow for more JavaScript tips and tricks! 🚀
