disallow if statements as the only statement in else blocks (no-lonely-if)

禁止 if 语句作为唯一语句出现在 else 语句块中 (no-lonely-if)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

命令行中的 --fix 选项可以自动修复一些该规则报告的问题。

If an if statement is the only statement in the else block, it is often clearer to use an else if form.

如果 if 语句作为唯一的语句出现在 else 语句块中,往往使用 else if 形式会使代码更清晰。

if (foo) {
    // ...
} else {
    if (bar) {
        // ...
    }
}

should be rewritten as

应该被重写为:

if (foo) {
    // ...
} else if (bar) {
    // ...
}

Rule Details

This rule disallows if statements as the only statement in else blocks.

该规则禁止 if 语句作为唯一语句出现在 else 语句块中。

Examples of incorrect code for this rule:

错误 代码示例:

/*eslint no-lonely-if: "error"*/

if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    }
}

if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    } else {
        // ...
    }
}

Examples of correct code for this rule:

正确 代码示例:

/*eslint no-lonely-if: "error"*/

if (condition) {
    // ...
} else if (anotherCondition) {
    // ...
}

if (condition) {
    // ...
} else if (anotherCondition) {
    // ...
} else {
    // ...
}

if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    }
    doSomething();
}

When Not To Use It

Disable this rule if the code is clearer without requiring the else if form.

如果不使用else if也能使代码比较清晰,禁用此规则即可。

Version

This rule was introduced in ESLint 0.6.0.

该规则在 ESLint 0.6.0 中被引入。

Resources


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