Function parameters redeclared
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ID: javascript-best-practices/no-dupe-args
Language: JavaScript
Severity: Error
Category: Best Practices
Description
In JavaScript, it’s syntactically valid to define multiple parameters with the same name in a function definition. However, doing so is considered bad practice as the last argument value will override the preceding argument value which can lead to issues that are hard to debug.
Non-Compliant Code Examples
function a(a, b, b) {}
function a(a, a, a) {}
function a(a, b, a) {}
function a(a, b, a, b) {}
var a = function(a, b, b) {}
var a = function(a, a, a) {}
var a = function(a, b, a) {}
var a = function(a, b, a, b) {}
Compliant Code Examples
function a(a, b, c){}
var a = function(a, b, c){}
function a({a, b}, {c, d}){}
function a([ , a]) {}
function foo([[a, b], [c, d]]) {}
