useIsArray

诊断类别：lint/suspicious/useIsArray

¥Diagnostic Category: lint/suspicious/useIsArray

JavaScript (and super languages)

自从：v1.0.0

¥Since: v1.0.0

来源：

¥Sources:

与以下相同：unicorn/no-instanceof-array

¥Same as: unicorn/no-instanceof-array

使用 Array.isArray() 而不是 instanceof Array。

¥Use Array.isArray() instead of instanceof Array.

在 JavaScript 中，一些类似数组的对象（例如参数）不是 Array 类的实例。/// Moreover, the global Array class can be different between two execution contexts.例如，Web 浏览器中的两个框架具有不同的 Array 类。在这些上下文之间传递数组会导致数组不是上下文全局 Array 类的实例。为了避免这些问题，请使用 Array.isArray() 而不是 instanceof Array。有关更多详细信息，请参阅 MDN 文档。

¥In JavaScript some array-like objects such as arguments are not instances of the Array class. /// Moreover, the global Array class can be different between two execution contexts. For instance, two frames in a web browser have a distinct Array class. Passing arrays across these contexts, results in arrays that are not instances of the contextual global Array class. To avoid these issues, use Array.isArray() instead of instanceof Array. See the MDN docs for more details.

示例

¥Examples

无效

¥Invalid

const xs = [];
if (xs instanceof Array) {}

code-block.js:2:5 lint/suspicious/useIsArray  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use Array.isArray() instead of instanceof Array.
  
    1 │ const xs = [];
  > 2 │ if (xs instanceof Array) {}
      │     ^^^^^^^^^^^^^^^^^^^
    3 │ 
  
  ℹ instanceof Array returns false for array-like objects and arrays from other execution contexts.
  
  ℹ Unsafe fix: Use Array.isArray() instead.
  
    1 1 │   const xs = [];
    2   │ - if·(xs·instanceof·Array)·{}
      2 │ + if·(Array.isArray(xs))·{}
    3 3 │

有效

¥Valid

const xs = [];
if (Array.isArray(xs)) {}

useIsArray

示例

无效

有效

相关链接