I was testing things. And discovered that i could not set arguments if i have not provided it.
Using arguments[1] etc.
Example:
function abc (a,b) {
arguments[1] = 'new value';
console.log(b);
}
abc('a');
It won't work.
I know i could set value like if (b=='undefined') b='default'; but why i can't like this. In other words this behavior is unexpected, isn't it?
On the other hand, if you do provide argument it will get changed!
calling function like this will output new value
abc('a','b');
is there a solution, if you wanted to set value using arguments[2] and pass argument when calling function.
after more testing it seems: b doesnt get connected with arguments[1] if not called.
My understanding is argument is dynamic whose length is set by number of arguments / parameters provided to the function.
In first case, you have provided only one parameter so size of argument is 1 and hence argument[1] should be out of bound, while in second case, you have argument of length 2 so you can change either parameter value by using its index.