Nested function call

A convention used in many programming languages (python, javascript, C, liquidsoap)

When you see:

foo(bar(baz()))

In fact what happens is:

• baz() gets called, and it's output * is used as input to:
• bar( * ) which gets call, and it's output ** sent as input to:
• foo ( ** )

Using temporary variables, the whole process could also be written:

x = baz()
y = bar(x)
z = foo(y)

But since it's more compact, programmers tend to write:

result = foo(bar(baz()))

Which often is more readable since you use less variable names, thus reducing cognitive overload.