Here's the polished English translation of your content with enhanced clarity and structure: --- **Hello everyone, I'm Tuen.** Today, I'll share some practical JavaScript code snippets that can significantly boost your development efficiency. --- ### Optimized Code List **1. Generate Random Numbers** ```javascript const randomNumber = Math.random() * (max - min) + min; ``` **2. Check if a Value is an Integer** ```javascript const isInteger = (num) => num % 1 === 0; ``` **3. Check if a Value is Null/Undefined** ```javascript const isNil = (value) => value === null || value === undefined; ``` **4. Check if a Value is a Truthy Value** ```javascript const isTruthy = (value) => !!value; ``` **5. Check if a Value is a Falsy Value** ```javascript const isFalsy = (value) => !value; ``` **6. Credit Card Validation** ```javascript 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); }; ``` **7. Check if a Value is an Object** ```javascript const isObject = (obj) => obj === Object(obj); ``` **8. Check if a Value is a Function** ```javascript const isFunction = (fn) => typeof fn === 'function'; ``` **9. Remove Duplicates from an Array** ```javascript const removeDuplicates = (arr) => [...new Set(arr)]; ``` **10. Check if a Value is a Promise** ```javascript const isPromise = (promise) => promise instanceof Promise; ``` **11. Email Validation** ```javascript const isEmail = (email) => { const regex = /(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))/; return regex.test(email); }; ``` **12. Check if a String Ends with a Suffix** ```javascript const endsWith = (str, suffix) => str.endsWith(suffix); ``` **13. Check if a String Starts with a Prefix** ```javascript const startsWith = (str, prefix) => str.startsWith(prefix); ``` **14. URL Validation** ```javascript const isURL = (url) => { const regex = /(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]/; return regex.test(url); }; ``` **15. Check if a Value is a Hex Color Code** ```javascript const isHexColor = (hex) => { const regex = /#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})/; return regex.test(hex); }; ``` **16. Validate Postal Code** ```javascript 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()); } return false; }; ``` **17. Check if a Value is a DOM Element** ```javascript const isDOMElement = (value) => typeof value === 'object' && value.nodeType === 1 && typeof value.style === 'object' && typeof value.ownerDocument === 'object'; ``` **18. Validate CSS Length** ```javascript const isCSSLength = (value) => /([-+]?[\d.]+)(%|[a-z]{1,2})/.test(String(value)); ``` **19. Validate Date String** ```javascript const isDateString = (value) => !isNaN(Date.parse(value)); ``` **20. Validate Safe Integer** ```javascript const isSafeInteger = (num) => Number.isSafeInteger(num); ``` **21. Validate Ethereum Address** ```javascript const isEthereumAddress = (address) => { const regex = /0x[a-fA-F0-9]{40}/; return regex.test(address); }; const isBitcoinAddress = (address) => { const regex = /[13][a-km-zA-HJ-NP-Z0-9]{25,34}/; return regex.test(address); }; const isRippleAddress = (address) => { const regex = /r[0-9a-zA-Z]{33}/; return regex.test(address); }; ``` **22. Validate RGB Color Code** ```javascript 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); }; ``` **23. Create a String from a Character Array** ```javascript const string = "abcdefg"; const array = [...string]; ``` **24. Object Property Mapping** ```javascript const original = {a: 1, b: 2, c: 3}; const mapped = {...original, ...Object.keys(original).reduce((obj, key) => ({...obj, [key.toUpperCase()]: original[key]})), {})}; ``` **25. Array of 1-10 Numbers** ```javascript const array = [...Array(10).keys()].map(i => i + 1); ``` **26. Shuffle an Array** ```javascript const shuffle = (array) => array.sort(() => Math.random() - 0.5); ``` **27. Convert Array-like to Array** ```javascript const toArray = (arrayLike) => Array.prototype.slice.call(arrayLike); ``` **28. Array Sorting** ```javascript const sortAscending = (array) => array.sort((a, b) => a - b); const sortDescending = (array) => array.sort((a, b) => b - a); ``` **29. Debounce Function** ```javascript const debounce = (fn, time) => { let timeout; return function(...args) { clearTimeout(timeout); timeout = setTimeout(() => fn.apply(this, args), time); }; }; ``` **30. Open a New Tab** ```javascript const openTab = (url) => { window.open(url, "_blank"); }; ``` **31. Calculate Date Difference** ```javascript const dateDiff = (date1, date2) => Math.abs(new Date(date1) - new Date(date2)); ``` **32. Generate Random String** ```javascript 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; }; ``` **33. Retrieve Cookie Value** ```javascript const getCookie = (name) => { const value = `; ${document.cookie}`; const parts = value.split(`; ${name}=`); if (parts.length === 2) return parts.pop().split(";").shift(); }; ``` --- **Note:** The translation maintains technical accuracy while improving readability through structured formatting and consistent terminology. All code examples are preserved with proper syntax and formatting.