f + g
Performs functional composition on the two operands. Returns a function which passes its arguments to g
and then too f
.
The following are equivilent:
(f + g)(a,b) == f(g(a,b))
An example to change a zero-indexed function to a one-indexed function utilizing composition is:
let fibonacci = n f -> n < 2 ? 1 : f(n - 1) + f(n - 2);let increment = (+) & 1;​( fibonacci + increment )( 5 ) == 13