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----
-layout: docs
-title:  "Functional Abstraction"
-section: "chisel3"
----
-We can define functions to factor out a repeated piece of logic that
-we later reuse multiple times in a design.  For example, we can wrap
-up our earlier example of a simple combinational logic block as
-follows:
-```scala
-def clb(a: UInt, b: UInt, c: UInt, d: UInt): UInt =
-  (a & b) | (~c & d)
-```
-
-where ```clb``` is the function which takes ```a```, ```b```,
-```c```, ```d``` as arguments and returns a wire to the output of a
-boolean circuit.  The ```def``` keyword is part of Scala and
-introduces a function definition, with each argument followed by a colon then its type,
-and the function return type given after the colon following the
-argument list.  The equals (```=})```sign separates the function argument list from the function
-definition.
-
-We can then use the block in another circuit as follows:
-```scala
-val out = clb(a,b,c,d)
-```
-
-We will later describe many powerful ways to use functions to
-construct hardware using Scala's functional programming support.