Need to restrict String object, need to resolve with purely mathematical

Very strange! When I run these codes, got different param names

var id = function(id) { return id; }
console.log(id.toString());
//=> function id(_id) { return _id; }

var _id = function(id) { return id; }
console.log(_id.toString());
//=> function _id(id) { return id; }

var _id = function(_id) { return _id; }
console.log(_id.toString());
//=> function _id(_id2) { return _id2; }

function id(id) { return id; }
console.log(id.toString());
//=> function id(id) { return id; }

All these codes run in the CW platform

When I refactored my solution, got failed with this test case. Even with my past solution!

console.log("var id = function (id) { return id; }");
var id = function (id) { return id; }
Test.assertEquals(defaultArguments(id,{id:"test"})(), "test", 'defaultArguments(id,{id:"test"})()');

I got this function declaration with console.log

function id(_id) {
return _id;
}

defaultArguments(id,{id:"test"})() - Expected: test, instead got: undefined

Kindly go through this tutorial for approving

Kindly go through this tutorial for approving

Kindly go through this tutorial for approving

Kindly go through this tutorial for approving

Kindly go through this tutorial for approving

Kindly go through this tutorial for approving

Kindly go through this tutorial

Many translations submitted, kindly review & approve it

How about restriction of loops? Just pure mathematical

Lack of test cases. Results of the solutions will be unexpected with below code.

function f(a, //comment
b,
/*
some comments
*/
c){}

Lack of test cases. Results of the solutions will be unexpected with below code.

function f(a, //comment
b,
/*
some comments
*/
c){}

Duplicate with this kata