Unable to rename function expression

!function c() {
  c = 20;
  console.log(c);
}()

The expected output is 20, however the result output is a function. What could have caused this unexpected behavior?

Answer №1

When operating in strict mode, attempting to reassign a named function expression will result in a TypeError throw with the message "Assignment to constant variable." This issue occurs because named function expressions are unable to have their names changed within the function body.

The behavior outlined above is detailed in ECMAScript 5's explanation of CreateImmutableBinding and Function Definition.

The process

FunctionExpression : function Identifier ( FormalParameterListopt ) { FunctionBody }

unfolds as follows:
Utilize the CreateImmutableBinding method of envRec by passing the String value of Identifier as an argument.

!function b(){
    "use strict";
    b=20;
    console.log(b);
}();

To resolve this issue, using var b = 20 creates a variable scoped only to the function body instead of attempting to modify the function expression's name.

!function b(){
    "use strict";
    var b = 20;
    console.log(b);
}();

Answer №2

To avoid conflicts, please ensure that the function name and global variable have unique names

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