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eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
70 lines
1.7 KiB
Markdown
70 lines
1.7 KiB
Markdown
# Disallow arrow functions where they could be confused with comparisons (no-confusing-arrow)
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Arrow functions (`=>`) are similar in syntax to some comparison operators (`>`, `<`, `<=`, and `>=`). This rule warns against using the arrow function syntax in places where it could be confused with a comparison operator.
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Here's an example where the usage of `=>` could be confusing:
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```js
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// The intent is not clear
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var x = a => 1 ? 2 : 3;
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// Did the author mean this
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var x = function (a) { return 1 ? 2 : 3 };
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// Or this
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var x = a <= 1 ? 2 : 3;
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```
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## Rule Details
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Examples of **incorrect** code for this rule:
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```js
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/*eslint no-confusing-arrow: "error"*/
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/*eslint-env es6*/
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var x = a => 1 ? 2 : 3;
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var x = (a) => 1 ? 2 : 3;
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```
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Examples of **correct** code for this rule:
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```js
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/*eslint no-confusing-arrow: "error"*/
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/*eslint-env es6*/
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var x = a => (1 ? 2 : 3);
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var x = (a) => (1 ? 2 : 3);
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var x = a => { return 1 ? 2 : 3; };
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var x = (a) => { return 1 ? 2 : 3; };
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```
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## Options
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This rule accepts a single options argument with the following defaults:
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```json
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{
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"rules": {
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"no-confusing-arrow": ["error", {"allowParens": true}]
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}
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}
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```
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`allowParens` is a boolean setting that can be `true`(default) or `false`:
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1. `true` relaxes the rule and accepts parenthesis as a valid "confusion-preventing" syntax.
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2. `false` warns even if the expression is wrapped in parenthesis
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Examples of **incorrect** code for this rule with the `{"allowParens": false}` option:
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```js
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/*eslint no-confusing-arrow: ["error", {"allowParens": false}]*/
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/*eslint-env es6*/
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var x = a => (1 ? 2 : 3);
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var x = (a) => (1 ? 2 : 3);
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```
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## Related Rules
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* [no-constant-condition](no-constant-condition.md)
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* [arrow-parens](arrow-parens.md)
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