How do I unset an element in an array in javascript?

Question

How do I remove the key \'bar\' from an array foo so that \'bar\' won\'t show up in

for(key in foo){alert(key);}

Answer 1

An important note: JavaScript Arrays are not associative arrays like those you might be used to from PHP. If your "array key" is a string, you're no longer operating on the contents of an array. Your array is an object, and you're using bracket notation to access the member named . Thus:

var myArray = [];
myArray["bar"] = true;
myArray["foo"] = true;
alert(myArray.length); // returns 0.

because you have not added elements to the array, you have only modified myArray's bar and foo members.