no-self-compare.js
1.17 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/**
* @fileoverview Rule to flag comparison where left part is the same as the right
* part.
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow comparisons where both sides are exactly the same",
category: "Best Practices",
recommended: false
},
schema: []
},
create(context) {
return {
BinaryExpression(node) {
const operators = ["===", "==", "!==", "!=", ">", "<", ">=", "<="];
if (operators.indexOf(node.operator) > -1 &&
(node.left.type === "Identifier" && node.right.type === "Identifier" && node.left.name === node.right.name ||
node.left.type === "Literal" && node.right.type === "Literal" && node.left.value === node.right.value)) {
context.report({ node, message: "Comparing to itself is potentially pointless." });
}
}
};
}
};