简中文档

use-isnan

NOTE: this rule is part of the 推荐 rule set.
Enable full set in deno.json:
{
  "lint": {
    "rules": {
      "tags": ["推荐"]
    }
  }
}
Enable full set using the Deno CLI:
deno lint --rules-tags=推荐
This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the include or exclude array in deno.json:
{
  "lint": {
    "rules": {
      "include": ["use-isnan"],
      "exclude": ["use-isnan"]
    }
  }
}

不允许与 NaN 进行比较。

因为 NaN 在 JavaScript 中是独特的,它不等于任何东西,包括它自己,所以与 NaN 的比较结果是令人困惑的:

  • NaN === NaNNaN == NaN 的结果为 false
  • NaN !== NaNNaN != NaN 的结果为 true

因此,这条规则要求使用 isNaN()Number.isNaN() 来判断值是否为 NaN

无效示例:

if (foo == NaN) {
  // ...
}

if (foo != NaN) {
  // ...
}

switch (NaN) {
  case foo:
    // ...
}

switch (foo) {
  case NaN:
    // ...
}

有效示例:

if (isNaN(foo)) {
  // ...
}

if (!isNaN(foo)) {
  // ...
}

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