今天这篇文章,我想跟大家分享一些强大的 JavaScript 单行代码,因为使用这些单行代码可以帮助你提升工作效率,在这篇文章中,我总结了30个实用的代码技巧,希望这些代码技巧对你有用。
那么,我们现在就开始吧。
const reversedString = str => str.split('').reverse().join('');
reversedString("Hello World"); // dlroW olleH
const titleCase = sentence => sentence.replace(/\b\w/g, char => char.toUpperCase());
titleCase("hello world"); // Hello World
[a, b] = [b, a];
const isTruthy = num => !!num;
isTruthy(0) // False
const uniqueArray = arr => [...new Set(arr)];
uniqueArray([5,5,2,2,2,4,2]) // [ 5, 2, 4 ]
const truncateString = (str, maxLength) => (str.length > maxLength) ? `${str.slice(0, maxLength)}...` : str;
truncateString("Hello World", 8); // Hello Wo...
const deepClone = obj => JSON.parse(JSON.stringify(obj));
const obj1 = { name: "John", age: 40};
const obj2 = deepClone(obj1);
obj2.age = 20;
console.log(obj1.age); // 40
//This method works for most objects, but it has some limitations. Objects with circular references or functions cannot be converted to JSON, so this method will not work for those types of objects.
const lastIndexOf = (arr, item) => arr.lastIndexOf(item);
lastIndexOf([5, 5, 4 , 2 , 3 , 4], 5) // 1
const mergeArrays = (...arrays) => [].concat(...arrays);
mergeArrays([5, 5, 4], [2 , 3 , 4]) // [5, 5, 4, 2, 3, 4]
const longestWord = sentence => sentence.split(' ').reduce((longest, word) => word.length > longest.length ? word : longest, '');
longestWord("The quick brown fox jumped over the lazy dog") // jumped
const range = (start, end) => [...Array(end - start + 1)].map((_, i) => i + start);
range(5, 15); // [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
const isEmptyObject = obj => Object.keys(obj).length === 0;
isEmptyObject({}) // true
isEmptyObject({ name: 'John' }) // false
const average = arr => arr.reduce((acc, num) => acc + num, 0) / arr.length;
average([1, 2, 3, 4, 5, 6, 7, 8, 9]) // 5
const objectToQueryParams = obj => Object.entries(obj).map(([key, val]) => `${encodeURIComponent(key)}=${encodeURIComponent(val)}`).join('&');
objectToQueryParams({ page: 2, limit: 10 }) // page=2&limit=10
const factorial = num => num <= 1 ? 1 : num * factorial(num - 1);
factorial(4) // 24
const countVowels = str => (str.match(/[aeiou]/gi) || []).length;
countVowels('The quick brown fox jumps over the lazy dog') // 11
const isValidEmail = email => /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/.test(email);
isValidEmail("example@email.com") // true
isValidEmail("example") // false
const removeWhitespace = str => str.replace(/\s/g, '');
removeWhitespace("H el l o") // Hello
const isLeapYear = year => (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0);
isLeapYear(2023) // false
isLeapYear(2004) // true
const generateRandomString = length => [...Array(length)].map(() => Math.random().toString(36)[2]).join('')
generateRandomString(8) // 4hq4zm7y
const copyToClipboard = (content) => navigator.clipboard.writeText(content)
copyToClipboard("Hello World")
const currentTime = () => new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false })
currentTime() // 19:52:21
const isEven = num => num % 2 === 0
isEven(1) // false
isEven(2) // true
const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches
console.log(isDarkMode) // false
const goToTop = () => window.scrollTo(0, 0)
goToTop()
const isValidDate = date => date instanceof Date && !isNaN(date);
isValidDate(new Date("This is not date.")) // false
isValidDate(new Date("08-10-2023")) // true
const generateDateRange = (startDate, endDate) => Array.from({ length: (endDate - startDate) / (24 * 60 * 60 * 1000) + 1 }, (_, index) => new Date(startDate.getTime() + index * 24 * 60 * 60 * 1000));
generateDateRange(new Date("2023-09-31"), new Date("2023-10-08")) // [Sun Oct 01 2023 05:30:00 GMT+0530 (India Standard Time), Mon Oct 02 2023 05:30:00 GMT+0530 (India Standard Time), Tue Oct 03 2023 05:30:00 GMT+0530 (India Standard Time), Wed Oct 04 2023 05:30:00 GMT+0530 (India Standard Time), Thu Oct 05 2023 05:30:00 GMT+0530 (India Standard Time), Fri Oct 06 2023 05:30:00 GMT+0530 (India Standard Time), Sat Oct 07 2023 05:30:00 GMT+0530 (India Standard Time), Sun Oct 08 2023 05:30:00 GMT+0530 (India Standard Time)]
const dayDiff = (d1, d2) => Math.ceil(Math.abs(d1.getTime() - d2.getTime()) / 86400000)
dayDiff(new Date("2023-10-08"), new Date("1999-04-31")) // 8926
const dayInYear = (d) => Math.floor((d - new Date(d.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24)
dayInYear(new Date('2023/10/08'))// 281
const areArraysEqual = (arr1, arr2) => JSON.stringify(arr1) === JSON.stringify(arr2);
areArraysEqual([1, 2, 3], [4, 5, 6]) // false
areArraysEqual([1, 2, 3], [1, 2, 3]) // false
JavaScript 行话是很有价值的工具,可以简化复杂的任务并提高代码的可读性。通过理解和利用这些技术,不仅展示了自己的熟练程度,还展示了编写高效、清晰和可维护代码的能力。
我希望你能发现它们有用之处,让它们适应你的项目,帮助你提升开发效率,不断优化你的解决方案。