7 Killer One-Liners in JavaScript

Tapajyoti Bose
3 min readFeb 13, 2022

JavaScript is the most crucial pillar of Web Development.

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Shuffle Array

While using algorithms that require some degree of randomization, you will often find shuffling arrays quite a necessary skill. The following snippet shuffles an array in place with O(n log n) complexity.

const shuffleArray = (arr) => arr.sort(() => Math.random() - 0.5);// Testing
const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

Copy to Clipboard

In web apps, copy to clipboard is rapidly rising in popularity due to its convenience for the user.

const copyToClipboard = (text) =>
navigator.clipboard?.writeText && navigator.clipboard.writeText(text);
// Testing
copyToClipboard("Hello World!");

NOTE: The approach works for 93.08% global users as per caniuse. So the check is necessary that the user’s browser supports the API. To support all users, you can use an input and copy its contents.

Unique Elements

Every language has its own implementation of Hash List, in JavaScript, it is called Set. You can easily get the unique elements from an array using the Set Data Structure.

const getUnique = (arr) => [...new Set(arr)];// Testing
const arr = [1, 1, 2, 3, 3, 4, 4, 4, 5, 5];

Detect Dark Mode

With the rising popularity of dark mode, it is ideal to switch your app to dark mode if the user has it enabled in their device. Luckily, media queries can be utilized for making the task a walk in the park.

const isDarkMode = () =>
window.matchMedia &&
window.matchMedia("(prefers-color-scheme: dark)").matches;
// Testing

As per caniuse the support of matchMedia is 97.19%.

Scroll To Top

Beginners very often find themselves struggling with scrolling elements into view properly. The easiest way to scroll elements is to use the scrollIntoView method. Add behavior: "smooth" for a smooth scrolling animation.

const scrollToTop = (element) =>
element.scrollIntoView({ behavior: "smooth", block: "start" });

Scroll To Bottom

Just like the scrollToTop method, the scrollToBottom method can easily be implemented using the scrollIntoView method, only by switching the block value to end

const scrollToBottom = (element) =>
element.scrollIntoView({ behavior: "smooth", block: "end" });

Generate Random Color

Does your application rely on random color generation? Look no further, the following snippet got you covered!

const generateRandomHexColor = () =>
`#${Math.floor(Math.random() * 0xffffff).toString(16)}`;

That’s all folks!

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Tapajyoti Bose

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