use Object.defineProperty to extend String prototype

[treywood]

Where possible (other than IE 8), use Object.defineProperty to extend the String prototype so that the linkify function is not enumerable on String instances.

This causes iteration over a string to behave correctly:

for (i in "test") { console.log(i); }
>> 0
>> 1
>> 2
>> 3

By only appending the property to the prototype (String.prototype.linkify = ...), you get:

for (i in "test") { console.log(i); }
>> 0
>> 1
>> 2
>> 3
>> linkify

[nfrasser]

👍