The JavaScript exception "missing variable name" is a common error. It is usually caused by omitting a variable name or a typographic error.

Get an overview of machine learning, including a typical machine learning workflow and how to accomplish workflow tasks.

A trait for objects which are byte-oriented sinks.

Simple and safe type conversions that may fail in a controlled way under some circumstances. It is the reciprocal of `TryInto`.

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.

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The difference() method of Set instances takes a set and returns a new set containing elements in this set but not in the given set.

The has() method of Map instances returns a boolean indicating whether an element with the specified key exists in this map or not.

The unary negation operator `-`.

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