“Array.prototype.slice: 'this' is not a JavaScript object” error in IE8

Question

It is my understanding that IE8 has access to the Array.prototype.slice method. Yet when I try to call it to turn a NodeList into an array, it give

Answer 1

The error message is accurate - your nodelist is not a JavaScript object, it is a "Host Object", which you can't necessarily pass around like regular JavaScript objects. Run this code in IE8's JavaScript console:

document.querySelectorAll("div") instanceof Object

It returns false.