Disallow return before else (no-else-return)

禁止在 else 前有 return (no-else-return)

If an if block contains a return statement, the else block becomes unnecessary. Its contents can be placed outside of the block.

如果 if 块中包含了一个 return 语句,else 块就成了多余的了。可以将其内容移至块外。

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。

function foo() {
    if (x) {
        return y;
    } else {
        return z;
    }
}

Rule Details

This rule is aimed at highlighting an unnecessary block of code following an if containing a return statement. As such, it will warn when it encounters an else following a chain of ifs, all of them containing a return statement.

该规则旨在突出含有 return 语句的 if 语句后的不必要的代码。因此,当else 语句出现在含有 return 语句的 if 语句之后,该规则将发出警告。

Examples of incorrect code for this rule:

错误 代码示例:

/*eslint no-else-return: "error"*/

function foo() {
    if (x) {
        return y;
    } else {
        return z;
    }
}

function foo() {
    if (x) {
        return y;
    } else if (z) {
        return w;
    } else {
        return t;
    }
}

function foo() {
    if (x) {
        return y;
    } else {
        var t = "foo";
    }

    return t;
}

// Two warnings for nested occurrences
function foo() {
    if (x) {
        if (y) {
            return y;
        } else {
            return x;
        }
    } else {
        return z;
    }
}

Examples of correct code for this rule:

正确 代码示例:

/*eslint no-else-return: "error"*/

function foo() {
    if (x) {
        return y;
    }

    return z;
}

function foo() {
    if (x) {
        return y;
    } else if (z) {
        var t = "foo";
    } else {
        return w;
    }
}

function foo() {
    if (x) {
        if (z) {
            return y;
        }
    } else {
        return z;
    }
}

Version

This rule was introduced in ESLint 0.0.9.

该规则在 ESLint 0.0.9 中被引入。

Resources


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