Enforce or disallow newlines between operands of ternary expressions (multiline-ternary)

要求或禁止在三元操作数中间换行 (multiline-ternary)

JavaScript allows operands of ternary expressions to be separated by newlines, which can improve the readability of your program.

JavaScript 允许三元操作数之间有换行,可以提高程序的可读性。

For example:

例如:

var foo = bar > baz ? value1 : value2;

The above can be rewritten as the following to improve readability and more clearly delineate the operands:

上面的代码可以重写为以下形式,来提高可读性,更加清晰的描述三元操作数。

var foo = bar > baz ?
    value1 :
    value2;

Rule Details

This rule enforces or disallows newlines between operands of a ternary expression.
Note: The location of the operators is not enforced by this rule. Please see the operator-linebreak rule if you are interested in enforcing the location of the operators themselves.

该规则强制或禁止在三元操作数之间有换行。注意:操作符的位置不是该规则强制的。如果你对操作符的位置感兴趣,可以查看operator-linebreak

Options

This rule has a string option:

该规则有一个字符串选项:

always

This is the default option.

这是默认选项:

Examples of incorrect code for this rule with the "always" option:

默认选项 "always"错误 代码示例:

/*eslint multiline-ternary: ["error", "always"]*/

foo > bar ? value1 : value2;

foo > bar ? value :
    value2;

foo > bar ?
    value : value2;

Examples of correct code for this rule with the "always" option:

默认选项 "always"正确 代码示例:

/*eslint multiline-ternary: ["error", "always"]*/

foo > bar ?
    value1 :
    value2;

foo > bar ?
    (baz > qux ?
        value1 :
        value2) :
    value3;

always-multiline

Examples of incorrect code for this rule with the "always-multiline" option:

/*eslint multiline-ternary: ["error", "always-multiline"]*/

foo > bar ? value1 :
    value2;

foo > bar ?
    value1 : value2;

foo > bar &&
    bar > baz ? value1 : value2;

Examples of correct code for this rule with the "always-multiline" option:

/*eslint multiline-ternary: ["error", "always-multiline"]*/

foo > bar ? value1 : value2;

foo > bar ?
    value1 :
    value2;

foo > bar ?
    (baz > qux ? value1 : value2) :
    value3;

foo > bar ?
    (baz > qux ?
        value1 :
        value2) :
    value3;

foo > bar &&
    bar > baz ?
        value1 :
        value2;

never

Examples of incorrect code for this rule with the "never" option:

选项 "never"错误 代码示例:

/*eslint multiline-ternary: ["error", "never"]*/

foo > bar ? value :
    value2;

foo > bar ?
    value : value2;

foo >
    bar ?
    value1 :
    value2;

Examples of correct code for this rule with the "never" option:

选项 "never"正确 代码示例:

/*eslint multiline-ternary: ["error", "never"]*/

foo > bar ? value1 : value2;

foo > bar ? (baz > qux ? value1 : value2) : value3;

When Not To Use It

You can safely disable this rule if you do not have any strict conventions about whether the operands of a ternary expression should be separated by newlines.

如果你对三元操作数是否有换行没有严格约定,你可以禁用此规则。

Compatibility

Version

This rule was introduced in ESLint 3.1.0.

该规则在 ESLint 3.1.0 中被引入。

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