Function.prototype.toString()

The toString() method of Function instances returns a string representing the source code of this function.

The Function object overrides the toString() method inherited from Object; it does not inherit Object.prototype.toString. For user-defined Function objects, the toString method returns a string containing the source text segment which was used to define the function.

JavaScript calls the toString method automatically when a Function is to be represented as a text value, e.g., when a function is concatenated with a string.

The toString() method will throw a TypeError exception (“Function.prototype.toString called on incompatible object”), if its this value object is not a Function object.

Syntax example: toString()