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Variable Binding

• http://en.wikipedia.org/wiki/Name_binding
• http://en.wikipedia.org/wiki/Variable

In programming languages, a variable can be thought of as a place to store a value in computer memory.

More precisely, a variable binds (associates) a name (sometimes called an identifier) with the location; a value in turn is stored as a data object in that location so that the object can be accessed later via the variable, much like referring to someone by name.

in name binding, the name of a variable is bound to the address of some particular block (contiguous sequence) of bytes in memory, and operations on the variable manipulate that block.

• rebinding - setting another object to be referenced
• mutation - changing the object
  
  
• Variable Binding (in Scheme)
  
  
• Variables (in Lisp), described in PracticalCommonLisp.

Once you've created a binding, you can do two things with it: get the current value and set it to a new value.

To assign a new value to a binding, you use the SETF macro

• Variables are the places (addresses) data is stored in.
• Assignments do not necessarily create new bindings!