noSparseArray

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/noSparseArray

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

¥This rule is recommended, which means is enabled by default.
此规则包含 unsafe 修复程序。

¥This rule has an unsafe 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-sparse-arrays 相同
  
  ¥Same as no-sparse-arrays

如何配置

¥How to configure

1
{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "noSparseArray": "error"
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      }
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    }
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  }
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}

描述

¥Description

防止使用稀疏数组（带空位的数组）。

¥Prevents the use of sparse arrays (arrays with holes).

稀疏数组可能包含空槽，这是因为两个元素之间使用了多个逗号，例如：

¥Sparse arrays may contain empty slots due to the use of multiple commas between two items, like the following:

1
const items = [a,,b];

包含空洞的数组可能会产生错误信息。例如，前面的代码片段中，items 的长度为 4，但用户真的想要一个包含四个元素的数组吗？或者只是打错了字。

¥Arrays with holes might yield incorrect information. For example, the previous snippet, items has a length of 4, but did the user really intended to have an array with four items? Or was it a typo.

此规则强制用户在存在漏洞的地方显式使用 undefined。

¥This rule enforce the user to explicitly an undefined in places where there’s a hole.

示例

¥Examples

无效

¥Invalid

1
[1,,2]

code-block.js:1:1 lint/suspicious/noSparseArray  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This array contains an empty slots..
  
  > 1 │ [1,,2]
      │ ^^^^^^
    2 │ 
  
  ℹ The presences of empty slots may cause incorrect information and might be a typo.
  
  ℹ Unsafe fix: Replace hole with undefined
  
    1 │ [1,·undefined,2]
      │    ++++++++++

有效

¥Valid

1
[1, undefined, 2]

noSparseArray

摘要

如何配置

描述

示例

无效

有效

相关链接