20 killer JavaScript single line code

This paper sorts out some practical JavaScript single line code, which is very easy to use~~

Find the cookie value through document.cookie

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

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

With the help of navigator.clipboard.writeText, the spoken text can be easily copied to the clipboard

The specification requires that you use before writing to the clipboard Permissions API Get clipboard write permission. However, the specific requirements of different browsers are different, because this is a new API. For more information, see compatibility table and Clipboard availability in Clipboard.

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

Use the following code snippet to check if the given date is valid.

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

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

Javascript does not have a built-in capital function, so we can use the following code.

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

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

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

const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=$;path=/`));

You can use the Math.random and padEnd properties to generate random hexadecimal colors.

const randomHex = () => `#$`; console.log(randomHex()); // Result: #92b008

You can easily delete duplicates using Set in JavaScript

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

You can easily retrieve query parameters from the url by passing window.location or the original url goole. Com? Search = easy & page = 3

const getParameters = (URL) => { URL = JSON.parse( '{"' + decodeURI(URL.split("?")[1]) .replace(/"/g, '\\') .replace(/&/g

20 October 2021, 16:54 | Views: 3524

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