noAssignInExpressions

诊断类别：lint/suspicious/noAssignInExpressions

¥Diagnostic Category: lint/suspicious/noAssignInExpressions

JavaScript (and super languages)

自从：v1.0.0

¥Since: v1.0.0

来源：

¥Sources:

灵感来自：no-cond-assign

¥Inspired from: no-cond-assign

禁止表达式中的赋值。

¥Disallow assignments in expressions.

在表达式中，通常会将比较运算符（例如 ==）误输入为赋值运算符（例如 =）。此外，在表达式中使用赋值令人困惑。实际上，表达式通常被认为是无副作用的。

¥In expressions, it is common to mistype a comparison operator (such as ==) as an assignment operator (such as =). Moreover, the use of assignments in expressions is confusing. Indeed, expressions are often considered as side-effect free.

示例

¥Examples

无效

¥Invalid

let a, b;
a = (b = 1) + 1;

code-block.ts:2:6 lint/suspicious/noAssignInExpressions ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The assignment should not be in an expression.
  
    1 │ let a, b;
  > 2 │ a = (b = 1) + 1;
      │      ^^^^^
    3 │ 
  
  ℹ The use of assignments in expressions is confusing.
    Expressions are often considered as side-effect free.

let a;
if (a = 1) {
}

code-block.ts:2:5 lint/suspicious/noAssignInExpressions ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The assignment should not be in an expression.
  
    1 │ let a;
  > 2 │ if (a = 1) {
      │     ^^^^^
    3 │ }
    4 │ 
  
  ℹ The use of assignments in expressions is confusing.
    Expressions are often considered as side-effect free.

function f(a) {
    return a = 1;
}

code-block.ts:2:12 lint/suspicious/noAssignInExpressions ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The assignment should not be in an expression.
  
    1 │ function f(a) {
  > 2 │     return a = 1;
      │            ^^^^^
    3 │ }
    4 │ 
  
  ℹ The use of assignments in expressions is confusing.
    Expressions are often considered as side-effect free.

有效

¥Valid

let a;
a = 1;

noAssignInExpressions

示例

无效

有效

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