noExtraBooleanCast

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/complexity/noExtraBooleanCast

¥Diagnostic Category: lint/complexity/noExtraBooleanCast
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 safe 修复程序。

¥This rule has a safe fix.
此规则的默认严重级别为 information。

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

¥Sources:
- 与 no-extra-boolean-cast 相同
  
  ¥Same as no-extra-boolean-cast

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "complexity": {
5
        "noExtraBooleanCast": "error"
6
      }
7
    }
8
  }
9
}

描述

¥Description

禁止不必要的布尔转换

¥Disallow unnecessary boolean casts

示例

¥Examples

无效

¥Invalid

1
if (!Boolean(foo)) {
2
}

code-block.js:1:6 lint/complexity/noExtraBooleanCast  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid redundant `Boolean` call
  
  > 1 │ if (!Boolean(foo)) {
      │      ^^^^^^^^^^^^
    2 │ }
    3 │ 
  
  ℹ It is not necessary to use `Boolean` call when a value will already be coerced to a boolean.
  
  ℹ Safe fix: Remove redundant `Boolean` call
  
    1 │ if·(!Boolean(foo))·{
      │      --------   -

1
while (!!foo) {}

code-block.js:1:8 lint/complexity/noExtraBooleanCast  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid redundant double-negation.
  
  > 1 │ while (!!foo) {}
      │        ^^^^^
    2 │ 
  
  ℹ It is not necessary to use double-negation when a value will already be coerced to a boolean.
  
  ℹ Safe fix: Remove redundant double-negation
  
    1 │ while·(!!foo)·{}
      │        --

1
let x = 1;
2
do {
3
1 + 1;
4
} while (Boolean(x));

code-block.js:4:10 lint/complexity/noExtraBooleanCast  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid redundant `Boolean` call
  
    2 │ do {
    3 │ 1 + 1;
  > 4 │ } while (Boolean(x));
      │          ^^^^^^^^^^
    5 │ 
  
  ℹ It is not necessary to use `Boolean` call when a value will already be coerced to a boolean.
  
  ℹ Safe fix: Remove redundant `Boolean` call
  
    4 │ }·while·(Boolean(x));
      │          -------- -

1
for (; !!foo; ) {}

code-block.js:1:8 lint/complexity/noExtraBooleanCast  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid redundant double-negation.
  
  > 1 │ for (; !!foo; ) {}
      │        ^^^^^
    2 │ 
  
  ℹ It is not necessary to use double-negation when a value will already be coerced to a boolean.
  
  ℹ Safe fix: Remove redundant double-negation
  
    1 │ for·(;·!!foo;·)·{}
      │        --

1
new Boolean(!!x);

code-block.js:1:13 lint/complexity/noExtraBooleanCast  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid redundant double-negation.
  
  > 1 │ new Boolean(!!x);
      │             ^^^
    2 │ 
  
  ℹ It is not necessary to use double-negation when a value will already be coerced to a boolean.
  
  ℹ Safe fix: Remove redundant double-negation
  
    1 │ new·Boolean(!!x);
      │             --

有效

¥Valid

1
Boolean(!x);
2
!x;
3
!!x;

noExtraBooleanCast

摘要

如何配置

描述

示例

无效

有效

相关链接