The Reflect.get() static method is like the property accessor syntax, but as a function.

The Reflect.getOwnPropertyDescriptor() static method is like Object.getOwnPropertyDescriptor(). It returns a property descriptor of the given property if it exists on the object, undefined otherwise.

The Number.NaN static data property represents Not-A-Number, which is equivalent to NaN. For more information about the behaviors of NaN, see the description for the global property.

The Function() constructor creates Function objects. Calling the constructor directly can create functions dynamically, but suffers from security and similar (but far less significant) performance issues as eval(). However, unlike eval (which may have access to the local scope), the Function constructor creates functions which execute in the global scope only.

The slice() method of TypedArray instances returns a copy of a portion of a typed array into a new typed array object selected from start to end (end not included) where start and end represent the index of items in that typed array. The original typed array will not be modified. This method has the same algorithm as Array.prototype.slice().

The __defineGetter__() method of Object instances binds an object's property to a function to be called when that property is looked up.

The Math.round() static method returns the value of a number rounded to the nearest integer.

The unshift() method of Array instances adds the specified elements to the beginning of an array and returns the new length of the array.

The Math.clz32() static method returns the number of leading zero bits in the 32-bit binary representation of a number.

The get() method of WeakMap instances returns a specified element from this WeakMap.