The function's name has been obscured by the name of its parameter

Question

The function's name has been obscured by the name of its parameter

Caution: ECMAScript 5 (ES5) strictly prohibits the use of arguments.callee(). To avoid this, either name function expressions or opt for a function declaration that calls itself. [MDN]

How can we refer to the o function within itself in this scenario?

function o(o) { o(); }
o('not a function'); // TypeError: o is not a function

EDIT:

Why not change the parameter/function name?

I'm currently debugging numerous files containing obfuscated JavaScript code.
In my view, this issue should be solvable through reflection without requiring refactoring.

EDIT:

In the above case, I am seeking a solution to reference the function within itself, or alternatively, an explanation or valid source indicating why the parameter name overtakes the function name.

javascript ecmascript-6 reflection syntax

Answer 1

Answer №1

Assigning a parameter the same name as another variable declared in the function will prioritize the parameter's value over the other declarations. To workaround this issue, consider renaming the parameter. Alternatively, if the conflicting variable is in the global scope, you can access it using window (applies to HTML documents only). Simply use window.functionName() to reference it correctly. Note that this method only works if the variable was defined in the global scope using the var keyword!

//global scope
var a = 1
function b(a) {
  console.log(a)
  console.log(window.a)
}
b(2) //outputs 2 and then 1
function o(o) {
  console.log(++a)
  if(a < 5) window.o() //calls o() from global scope
}
o()

Answer 2

Assigning a parameter the same name as another variable declared in the function will prioritize the parameter's value over the other declarations. To workaround this issue, consider renaming the parameter. Alternatively, if the conflicting variable is in the global scope, you can access it using window (applies to HTML documents only). Simply use window.functionName() to reference it correctly. Note that this method only works if the variable was defined in the global scope using the var keyword!

//global scope
var a = 1
function b(a) {
  console.log(a)
  console.log(window.a)
}
b(2) //outputs 2 and then 1
function o(o) {
  console.log(++a)
  if(a < 5) window.o() //calls o() from global scope
}
o()

Answer 3

Answer №2

The parameter 'o' within the function is expected to be a reference to another function or a function name, not a string.

function sampleFunction() { console.log('This is a sample function'); }
function outputFunction(o) { console.log('Outputting the result of o function:'); o(); }
outputFunction(sampleFunction); 
// Outputting the result of o function:
// This is a sample function

Answer 4

The parameter 'o' within the function is expected to be a reference to another function or a function name, not a string.

function sampleFunction() { console.log('This is a sample function'); }
function outputFunction(o) { console.log('Outputting the result of o function:'); o(); }
outputFunction(sampleFunction); 
// Outputting the result of o function:
// This is a sample function

Answer 5

Answer №3

Utilized the library shift-refactor to apply a straightforward approach (using the rename function) since I couldn't find an alternative:

$source('FunctionDeclaration,FunctionExpression').forEach(fd => {
  if(fd.name)
  {
    for (let param of fd.params.items) {
      if (param.name === fd.name.name) {
        $source(param).rename('randomParameterName');
        break;
      }
    }
  }
});

Answer 6

Utilized the library shift-refactor to apply a straightforward approach (using the rename function) since I couldn't find an alternative:

$source('FunctionDeclaration,FunctionExpression').forEach(fd => {
  if(fd.name)
  {
    for (let param of fd.params.items) {
      if (param.name === fd.name.name) {
        $source(param).rename('randomParameterName');
        break;
      }
    }
  }
});

The function's name has been obscured by the name of its parameter

Answer №1

Answer №2

Answer №3

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