本文共 1415 字，大约阅读时间需要 4 分钟。

1. if多条件判断

// 冗余if (x === 'abc' || x === 'def' || x === 'ghi' || x ==='jkl') {
   }// 简洁if (['abc', 'def', 'ghi', 'jkl'].includes(x)) {
   }

2.if…else…

// 冗余let test: boolean;if (x > 100) {
       test = true;} else {
       test = false;}// 简洁let test = x > 10;

3.Null, Undefined, 空值检查

// 冗余if (first !== null || first !== undefined || first !== '') {
       let second = first;}// 简洁let second = first || '';

4.foreach循环

// 冗余for (var i = 0; i < testData.length; i++)    // 简洁for (let i in testData)// 或for (let i of testData)

5.函数条件调用

// 冗余function test1() {
     console.log('test1');};function test2() {
     console.log('test2');};var test3 = 1;if (test3 == 1) {
     test1();} else {
     test2();}// 简单(test3 === 1? test1:test2)();

6.switch条件

// 冗余switch (data) {
     case 1:    test1();  break;  case 2:    test2();  break;  case 3:    test();  break;  // so on...}// 简洁var data = {
     1: test1,  2: test2,  3: test};data[anything] && data[anything]();

7.多行字符串

// 冗余const data = 'abc abc abc abc abc abc\n\t'    + 'test test,test test test test\n\t'// 简洁const data = `abc abc abc abc abc abc         test test,test test test test`

8.隐式返回

// 冗余function getArea(diameter) {
     return Math.PI * diameter}// 简洁getArea = diameter => (  Math.PI * diameter;)

9.重复字符串多次

// 冗余let test = ''; for(let i = 0; i < 5; i ++) {
      test += 'test '; } // 简洁'test '.repeat(5);

10.幂乘

// 冗余Math.pow(2,3);// 简洁而2**3 // 8

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