var a = "asd";
toString.call(a); //prints [object String]
Why does this not the same as a.toString();? The value of this within the toString function would be a in both cases right? I expected it output "asd" (same as a.toString()).
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2 Answers
What you use is the window.toString, but it should be:
String.prototype.toString.call(a) // then it should be same
3 Comments
everconfusedGuy
How is window.toString() different from String.prototype.toString()? Is there any documentation explaining the behavior of window.toString()?
xdazz
They are just different implementations.
Derek 朕會功夫
@xdazz - I believe
toString in window has different native code than toString in String just like forEach in Array and Node ListThey are different methods (although they have the same name). In addition to @xdazz's answer, to prove that toString behaves differently in other types:
[].toString.call("abc"); //Array
This will also not return "abc".
document.querySelectorAll("*").toString.call("abc") //Node List
Not "abc".
(2).prototype.toString.call("abc") //Number
Error, and also toString in Number also can have a radix argument.
Conclusion: They are all different. Since window is some kind of weird Object, it doesn't share the same toString as String's.
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