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September 19, 2021 08:47 am GMT

20 Killer JavaScript One Liners

Hello Folks

This is Savio here. I'm young dev with an intention to enhance as a successful web developer. I love building web apps with React. I have proved my superiority in frontend technologies.

Today, I'd like to share 20 Killer JavaScript one liners to make your life easier. Let's goooo

Get Value of a brower Cookie

Retrieve the value of a cookie by accessing with document.cookie

cookie = name => `; ${document.cookie}`.split(`; ${name}=`).pop().split(';').shift();cookie('_ga');// Result: "GA1.2.1929736587.1601974046"

Convert RGB to Hex

const rgbToHex = (r, g, b) =>  "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);rgbToHex(0, 51, 255); // Result: #0033ff

Copy to Clipboard

Easily copy any text to clipboard using navigator.clipboard.writeText.

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

Check if Date is Valid

Use the following snippet to check if a given date is valid or not.

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());isDateValid("December 17, 1995 03:24:00");// Result: true

Find the day of year

Find which is the day by a given date.

const dayOfYear = (date) =>  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);dayOfYear(new Date());// Result: 272

Capitalise a String

Javascript doesn't have an inbuilt capitalise function, so we can use the following code for the purpose.

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)capitalize("follow for more")// Result: Follow for more

Find the number of days between two days

Find the days between 2 given days using the following snippet.

const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)dayDif(new Date("2020-10-21"), new Date("2021-10-22"))// Result: 366

Clear All Cookies

You can easily clear all cookies stored in a web page by accessing the cookie using document.cookie and clearing it.

const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=${new Date(0).toUTCString()};path=/`));

Generate Random Hex

You can generate random hex colors with Math.random and padEnd properties.

const randomHex = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, "0")}`;console.log(randomHex());// Result: #92b008

Remove Duplicated from Array

You can easily remove duplicates with Set in JavaScript. Its a life saver.

const removeDuplicates = (arr) => [ Set(arr)];console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));// Result: [ 1, 2, 3, 4, 5, 6 ]

Get Query Params from URL

You can easily retrieve query params from a url either by passing window.location or the raw URL

const getParameters = (URL) => {  URL = JSON.parse('{"' + decodeURI(URL.split("?")[1]).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') +'"}');  return JSON.stringify(URL);};getParameters(window.location)// Result: { search : "easy", page : 3 }

Log Time from Date

We can log time, in the format hour::minutes::seconds from a given date.

const timeFromDate = date => date.toTimeString().slice(0, 8);console.log(timeFromDate(new Date(2021, 0, 10, 17, 30, 0))); // Result: "17:30:00"

Check if a number is even or odd

const isEven = num => num % 2 === 0;console.log(isEven(2)); // Result: True

Find Average of Numbers

Find the average between multiple numbers using reduce method.

const average = (...args) => args.reduce((a, b) => a + b) / args.length;average(1, 2, 3, 4);// Result: 2.5

Scroll to Top

You can use window.scrollTo(0, 0) method to automatic scroll to top. Set both x and y as 0.

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

Reverse a string

You can easily reverse a string using split, reverse and join methods.

const reverse = str => str.split('').reverse().join('');reverse('hello world');     // Result: 'dlrow olleh'

Check if array is empty

Simple one liner to check if an array is empty, will return true or false.

const isNotEmpty = arr => Array.isArray(arr) && arr.length > 0;isNotEmpty([1, 2, 3]);// Result: true

Get Selected Text

Get the text the user has select using inbuilt getSelection property.

const getSelectedText = () => window.getSelection().toString();getSelectedText();

Shuffle an Array

Shuffling an array is super easy with sort and random methods.

const shuffleArray = (arr) => arr.sort(() => 0.5 - Math.random());console.log(shuffleArray([1, 2, 3, 4]));// Result: [ 1, 4, 3, 2 ]

Detect Dark Mode

Check if a user's device is in dark mode with the following code.

const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matchesconsole.log(isDarkMode) // Result: True or False

Wrapping Up

Yeah, that's a wrap. Hope you enjoyed the article. Do not hesitate to share your feedback. I am on Twitter @saviomartin7. Give a follow!

Follow me on Github @saviomartin, Don't miss my amazing projects!

Feedbacks are greatly appreciated! Have an amazing day!

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