Rule: Avoid redeclaration of functions

Title

Avoid redeclaration of functions

Severity

Major

Description

This rule checks that functions declared in same scope don't have identical names. Indeed, it is possible to declare 2 functions with the same name, but only the last definition will be kept by the JavaScript engine before starting execution of the whole code. The following code illustrates this:

fun(); // prints "bar"

// first declaration of the function
function fun() {
  print("foo");
}

fun(); // prints "bar"

// redeclaration of the "fun" function: this definition overrides the previous one
function fun() {
  print("bar");
}

fun(); // prints "bar"

This use of duplicate function name is often unwanted and can lead to bugs and more generally to confusing code.

Message

Rename function '

' as this name is already used.

Activated?

Yes

Cardinality

Single