noApproximativeNumericConstant

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.3.0

¥Rule available since: v1.3.0
诊断类别：lint/suspicious/noApproximativeNumericConstant

¥Diagnostic Category: lint/suspicious/noApproximativeNumericConstant
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 warning。

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

¥Sources:
- 与 approx_constant 相同
  
  ¥Same as approx_constant

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "suspicious": {
5
        "noApproximativeNumericConstant": "error"
6
      }
7
    }
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  }
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}

描述

¥Description

使用标准常量而不是近似文字。

¥Use standard constants instead of approximated literals.

通常，标准库中的定义比人们想出的更精确，或者使用的常量超出了数字类型的最大精度。

¥Usually, the definition in the standard library is more precise than what people come up with or the used constant exceeds the maximum precision of the number type.

示例

¥Examples

无效

¥Invalid

1
let x = 3.141;

code-block.js:1:9 lint/suspicious/noApproximativeNumericConstant  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Prefer constants from the standard library.
  
  > 1 │ let x = 3.141;
      │         ^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use Math.PI instead.
  
    1   │ - let·x·=·3.141;
      1 │ + let·x·=·Math.PI;
    2 2 │

1
let x = 2.302;

code-block.js:1:9 lint/suspicious/noApproximativeNumericConstant  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Prefer constants from the standard library.
  
  > 1 │ let x = 2.302;
      │         ^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use Math.LN10 instead.
  
    1   │ - let·x·=·2.302;
      1 │ + let·x·=·Math.LN10;
    2 2 │

有效

¥Valid

1
let x = Math.PI;
2
let y = 3.14;

1
let x = Math.LN10;

noApproximativeNumericConstant

摘要

如何配置

描述

示例

无效

有效

相关链接