25个JavaScript One-Liner让你更专业

今天我们分享一些单行代码技巧，了解这些技巧，可以提升我们的工作效率，现在，我们一起来看一下今天的这些单行代码技巧吧。

数组

1. 检查变量是否是数组

const isArray = Array.isArray(arr);
const isArray = arr instanceof Array;

2. 数字数组的和

const sum = (arr) => arr.reduce((a, b) => a + b);

3.从数组中删除Falsy值

const removeFalsyValues = (arr) => arr.filter(x => x);
// or 
const removeFalsyValues = (arr) => arr.filter(Boolean);

4. 数字数组的平均值

const average = (arr) => arr.reduce((a, b) => a + b) / arr.length;

5. 合并并删除重复项

const merge = (arr1, arr2) => [...new Set(arr1.concat(arr2))];
// or
const merge = (arr1, arr2) => [...new Set([...arr1, ...arr2])];

6. 合并两个数组

const merge = (arr1, arr2) => [].concat(arr1, arr2);
// or
const merge = (arr1, arr2) => [...arr1, ...arr2];

7. 打乱数组

const shuffle = (arr) => arr.slice().sort(() => Math.random() - 0.5);

8. 获取数组的最后一个元素

const lastElement = (arr) => arr[arr.length-1];
// or
const lastElement = (arr) => arr.slice(-1)[0];
// or
const lastElement = (arr) => arr.slice().pop();

9. 查找数组中的唯一值

const findUniqueValues = (arr) => arr.filter((i) => arr.indexOf(i) === arr.lastIndexOf(i));

10. 克隆数组

const clone = (arr) => arr.slice();
// or
const clone = (arr) => [...arr];

字符串

11. 将字符串大写

const capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1);

12. 字符串反转

const reverseString = (str) => str.split("").reverse().join("");
// or
const reverseString = (str) => [...str].reverse().join();

13. 将字符串转换为数字

const toNumber = (str) => Number(str);
// or
const toNumber = (str) => +str;

14. 将字符串转换为字符数组

const toCharArray = (str) => str.split('');
// or
const toCharArray = (str) => [...str];
// or
const toCharArray = (str) => Array.from(str);
// or
const toCharArray = (str) => Object.assign([], str);

15. 将 Snake 大小写转换为 Camel 大小写

const snakeToCamel = (str) => str.toLowerCase().replace(/(_\w)/g, (word) => word.toUpperCase().substr(1));

日期

16. 两个日期之间的天数

const daysBetweenDates = (date1, date2) => Math.ceil(Math.abs(date1 - date2) / (1000 * 60 * 60 * 24));

17. 工作日约会时间

const getWeekday = (date) => ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][date.getDay()];
// or 
const getWeekday = (date) => date.toLocaleString('en-US', {weekday: 'long'});

随机

18. 随机数生成器

const randomNumber = (rangeStart, rangeEnd) => new Date().getTime() % rangeEnd + rangeStart;
// or
const randomNumber = (min, max) => Math.floor(Math.random() * (max - min + 1) + min);

19.随机十六进制颜色生成器

const randomHexColor = () => `#${Math.random().toString(16).slice(2, 8).padEnd(6, '0')}`;

20. 随机布尔生成器

const randomBoolean = () => Math.random() >= 0.5;

验证 

21. 检查数组是否为空

const isEmpty = (arr) => !Array.isArray(arr) || !arr.length;

22. 检查数组是否包含值

const includes = (arr, value) => arr.indexOf(value) != -1;
// or
const includes = (arr, value) => arr.includes(value);

23. 检查日期是否是周末

const isWeekend = (date) => [5, 6].indexOf(date.getDay()) !== -1;

网络实用程序 

24.复制到剪贴板

const copyToClipboard = (text) =>
  navigator.clipboard?.writeText && navigator.clipboard.writeText(text);


// Testing
copyToClipboard("Hello World!");

25.检测深色模式

const isDarkMode = () =>
  window.matchMedia &&
  window.matchMedia("(prefers-color-scheme: dark)").matches;


// Testing
console.log(isDarkMode());

总结

以上内容，就是我今天想与你分享的全部内容，希望这些内容，能够对你有所帮助。