JavaScript: How to set a property for a function?

I'm testing one of my functions, and I want to test whether a specific function is called with the right argument from that code.

For that reason, I overwrite the original function like this:

var oldSort = sort;
sort = function(array) {
    this.arrayToSort = array;
}

Then I execute it and check that the property sort.arrayToSort is set to the value I passed in and reassign the original function:

sort(myArray);
deepEqual(myArray, sort.arrayToSort); 
sort = oldSort;

However, I can't access sort.arrayToSort like that. How can I set a property of the function to make that possible? Right now, I'开发者_开发技巧m declaring a variable above the sort function and have it set that, but I'd rather have it as a property of the function to keep its scope small. Is that possible?

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Sounds like you want arguments.callee, which refers to the function itself, rather than the object it was bound to.

var oldSort = sort;
sort = function(array) {
    arguments.callee.arrayToSort = array;
}

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you cant access the function properties if you don't create it with new keyword.

mysort = new sort(array);
alert(mysort.arrayToSort);

you can use custom comparator function in original sort. like this

array.sort(sortfunction)

function sortfunction(a, b){
   //Compare "a" and "b" in some fashion, and return -1, 0, or 1
}