Hands-On Design Patterns and Best Practices with Julia

Broadcasting along functional pipes

In a data processing pipeline, we may encounter a situation where the functions can be fused together into a single loop. This is called broadcasting and it can be conveniently enabled by using the dot notation. Using broadcasting may make a huge performance difference for data-intensive applications.

Consider the following scenario, where two vectorized functions have already been defined, as follows:

add1v(xs) = [x + 1 for x in xs]mul2v(xs) = [2x for x in xs]

The add1v function takes a vector and increments all the elements by 1. Likewise, the mul2v function takes a vector and multiplies every element by 2. Now, we can combine the functions to create a new one that takes a vector and sends it down the ...