putd

putd( 
s_functionName 
u_functionDef 
) 
=> u_functionDef

Description

Assigns a new function binding, which must be a function, a lambda expression, or nil, to a function name. If you just want to define a function, use procedure or defun.

Assigns the function definition of u_functionDef to s_functionName. This is different from alias, which does a macro expansion when evaluated. You can undefine a function name by setting its function binding to nil. A function name can be write-protected by the system to protect you from unintentional name collisions, in which case you cannot change the function binding of that function name using putd.

If you just want to define a function, use procedure or defun.

Arguments

s_functionName	Name of the function.
u_functionDef	New function binding, which must be a binary function, a lambda expression, or nil.

Value Returned

u_functionDef

Function definition, which is either a binary function or a SKILL expression.

Examples

Assigns the function mySqrt the same definition as sqrt.

putd( 'mySqrt getd( 'sqrt )) 
=> lambda:sqrt

Assigns the symbol newFn a function definition that prints the string This is a new function when called.

putd( 'newFn lambda( () println( "This is a new function" )))
=> funobj:0x3cf088

Related Topics

Function and Program Structure

Return to top