32 Awesome JavaScript Snippets (one-liners) You Should Use in 2023
HackerNoon Hi is 18 years old. His goal is to become a successful developer. He is interested in building web apps with frontend technologies. His name is [Rahul] and he is 18-years-old. He’s also interested in developing web apps for frontend technology with front end technologies.
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- Generate a random number between two values:
const randomNumber = Math.random() * (max - min) + min - Check if a number is an integer:
const isInteger = (num) => num % 1 === 0 - Check if a value is
nullorundefined:const isNil = (value) => value === null || value === undefined - Check if a value is a truthy value:
const isTruthy = (value) => !!value - Check if a value is a falsy value:
const isFalsy = (value) => !value - Check if a value is a valid credit card number:
const isCreditCard = (cc) => {
const regex = /(?:4[0-9]{12}(?:[0-9]{3})?|[25][1-7][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})/;
return regex.test(cc);
}- Check if a value is an object:
const isObject = (obj) => obj === Object(obj) - Check if a value is a function:
const isFunction = (fn) => typeof fn === 'function' - Remove Duplicated from Array
const removeDuplicates = (arr) => [...new Set(arr)]; - Check if a value is a promise:
const isPromise = (promise) => promise instanceof Promise - Check if a value is a valid email address:
const isEmail = (email) => {
const regex = /(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))/;
return regex.test(email);
}- Check if a string ends with a given suffix:
const endsWith = (str, suffix) => str.endsWith(suffix) - Check if a string starts with a given prefix:
const startsWith = (str, prefix) => str.startsWith(prefix) - Check if a value is a valid URL:
const isURL = (url) => {
const regex = /(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+/;
return regex.test(url);
}- Check if a value is a valid hexadecimal color code:
const isHexColor = (hex) => {
const regex = /#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})/;
return regex.test(hex);
}- Check if a value is a valid postal code:
const isPostalCode = (postalCode, countryCode) => {
if (countryCode === 'US') {
const regex = /[0-9]{5}(?:-[0-9]{4})?/;
return regex.test(postalCode);
} else if (countryCode === 'CA') {
const regex = /[ABCEGHJKLMNPRSTVXY][0-9][ABCEGHJKLMNPRSTVWXYZ] [0-9][ABCEGHJKLMNPRSTVWXYZ][0-9]/;
return regex.test(postalCode.toUpperCase());
} else {
// Add regex for other country codes as needed
return false;
}
}- Check if a value is a DOM element:
const isDOMElement = (value) => typeof value === 'object' && value.nodeType === 1 && typeof value.style === 'object' && typeof value.ownerDocument === 'object';- Check if a value is a valid CSS length (e.g.
10px,1em,50%):
const isCSSLength = (value) => /([-+]?[\d.]+)(%|[a-z]{1,2})/.test(String(value));- Check if a value is a valid date string (e.g.
2022-09-01,September 1, 2022,9/1/2022):
const isDateString = (value) => !isNaN(Date.parse(value));- Check if a value is a number representing a safe integer (those integers that can be accurately represented in JavaScript):
const isSafeInteger = (num) => Number.isSafeInteger(num) - Check if a value is a valid Crypto address:
//Ethereum
const isEthereumAddress = (address) => {
const regex = /0x[a-fA-F0-9]{40}/;
return regex.test(address);
}
//bitcoin
const isBitcoinAddress = (address) => {
const regex = /[13][a-km-zA-HJ-NP-Z0-9]{25,34}/;
return regex.test(address);
}
// ripple
const isRippleAddress = (address) => {
const regex = /r[0-9a-zA-Z]{33}/;
return regex.test(address);
}- Check if a value is a valid RGB color code
const isRGBColor = (rgb) => {
const regex = /rgb\(\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*,\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*,\s*([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\s*\)/;
return regex.test(rgb);
}- Quickly create an array of characters from a string:
const string = "abcdefg";
const array = [...string];- Quickly create an object with all the properties and values of another object, but with a different key for each property
const original = {a: 1, b: 2, c: 3};
const mapped = {...original, ...Object.keys(original).reduce((obj, key) => ({...obj, [key.toUpperCase()]: original[key]}), {})};- Quickly create an array of numbers from 1 to 10
const array = [...Array(10).keys()].map(i => i + 1);- Quickly shuffle an array
const shuffle = (array) => array.sort(() => Math.random() - 0.5);- Convert an array-like object (such as a NodeList) to an array
const toArray = (arrayLike) => Array.prototype.slice.call(arrayLike);- Sort Arrays
//Ascending
const sortAscending = (array) => array.sort((a, b) => a - b);
//Descending
const sortDescending = (array) => array.sort((a, b) => b - a);- Debounce a function
const debounce = (fn, time) => {
let timeout;
return function(...args) {
clearTimeout(timeout);
timeout = setTimeout(() => fn.apply(this, args), time);
};
};- Open a new tab with a given URL
const openTab = (url) => {
window.open(url, "_blank");
};- Get the difference between two dates
const dateDiff = (date1, date2) => Math.abs(new Date(date1) - new Date(date2));- Generate a random string of a given length
const randomString = (length) => {
let result = "";
const characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for (let i = 0; i < length; i++) {
result += characters.charAt(Math.floor(Math.random() * characters.length));
}
return result;
};- Get value of cookie
const getCookie = (name) => {
const value = `; ${document.cookie}`;
const parts = value.split(`; ${name}=`);
if (parts.length === 2) return parts.pop().split(";").shift();
};Thank you for Reading. It is important to note that simply copying and pasting code without understanding how it works can lead to problems down the line.
