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f9dd34d301
PR-URL: https://github.com/iojs/io.js/pull/1539 Fixes: https://github.com/iojs/io.js/issues/1253 Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Trevor Norris <trev.norris@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com> Reviewed-By: Johan Bergström <bugs@bergstroem.nu> Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
28 lines
923 B
JavaScript
28 lines
923 B
JavaScript
/**
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* @fileoverview Rule to flag comparison where left part is the same as the right
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* part.
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = function(context) {
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return {
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"BinaryExpression": function(node) {
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var operators = ["===", "==", "!==", "!=", ">", "<", ">=", "<="];
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if (operators.indexOf(node.operator) > -1 &&
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(node.left.type === "Identifier" && node.right.type === "Identifier" && node.left.name === node.right.name ||
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node.left.type === "Literal" && node.right.type === "Literal" && node.left.value === node.right.value)) {
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context.report(node, "Comparing to itself is potentially pointless.");
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}
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}
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};
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};
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