The unary logical negation operator `!`.

The substring() method of String values returns the part of this string from the start index up to and excluding the end index, or to the end of the string if no end index is supplied.

The remainder operator `%`.

The return() method of Generator instances acts as if a return statement is inserted in the generator's body at the current suspended position, which finishes the generator and allows the generator to perform any cleanup tasks when combined with a try...finally block.

A mutable iterator over the values of a `HashMap`.

The Symbol.match static data property represents the well-known symbol Symbol.match. The String.prototype.match() method looks up this symbol on its first argument for the method used to match an input string against the current object. This symbol is also used to determine if an object should be treated as a regex.

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