Function set!

set! varName value

Modifies the contents of a variable.

Parameters:

varName - Symbol identifying the variable to be modified.

value - The object for wich the variable will hold a reference.

Returns:

The news contents of the variable, that is, a reference to value object.

Changes the contents of a variable accessible in the currente context. A reference to the object passed as the value is stored in the variable identified by the symbol varName. The function set! does not create new variables. The variable must have already been created. If that is not the case a runtime exception is thrown. New variables can be created using the define function.