noDuplicateCase

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/suspicious/noDuplicateCase

¥Diagnostic Category: lint/suspicious/noDuplicateCase
此规则为推荐规则，默认启用。

¥This rule is recommended, which means is enabled by default.
此规则没有修复方案。

¥This rule doesn’t have a fix.
此规则的默认严重级别为 error。

¥The default severity of this rule is error.
来源：

¥Sources:
- 与 no-duplicate-case 相同
  
  ¥Same as no-duplicate-case

如何配置

¥How to configure

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{
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  "linter": {
3
    "rules": {
4
      "suspicious": {
5
        "noDuplicateCase": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止重复的案例标签。

¥Disallow duplicate case labels.

如果 switch 语句在 case 子句中有重复的测试表达式，则程序员很可能复制了 case 子句但忘记更改测试表达式。

¥If a switch statement has duplicate test expressions in case clauses, it is likely that a programmer copied a case clause but forgot to change the test expression.

示例

¥Examples

无效

¥Invalid

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switch (a) {
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    case 1:
3
        break;
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    case 1:
5
        break;
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    default:
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        break;
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}

code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate case label.
  
    2 │     case 1:
    3 │         break;
  > 4 │     case 1:
      │          ^
    5 │         break;
    6 │     default:
  
  ℹ The first similar label is here:
  
    1 │ switch (a) {
  > 2 │     case 1:
      │          ^
    3 │         break;
    4 │     case 1:

1
switch (a) {
2
    case one:
3
        break;
4
    case one:
5
        break;
6
    default:
7
        break;
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}

code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate case label.
  
    2 │     case one:
    3 │         break;
  > 4 │     case one:
      │          ^^^
    5 │         break;
    6 │     default:
  
  ℹ The first similar label is here:
  
    1 │ switch (a) {
  > 2 │     case one:
      │          ^^^
    3 │         break;
    4 │     case one:

1
switch (a) {
2
    case "1":
3
        break;
4
    case "1":
5
        break;
6
    default:
7
        break;
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}

code-block.js:4:10 lint/suspicious/noDuplicateCase ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate case label.
  
    2 │     case “1”:
    3 │         break;
  > 4 │     case “1”:
      │          ^^^
    5 │         break;
    6 │     default:
  
  ℹ The first similar label is here:
  
    1 │ switch (a) {
  > 2 │     case “1”:
      │          ^^^
    3 │         break;
    4 │     case “1”:

有效

¥Valid

1
switch (a) {
2
    case 1:
3
        break;
4
    case 2:
5
        break;
6
    default:
7
        break;
8
}

1
switch (a) {
2
    case one:
3
        break;
4
    case two:
5
        break;
6
    default:
7
        break;
8
}

1
switch (a) {
2
    case "1":
3
        break;
4
    case "2":
5
        break;
6
    default:
7
        break;
8
}

noDuplicateCase

摘要

如何配置

描述

示例

无效

有效

相关链接