Learning Functional Programming in Go

Refactoring long parameter lists

Long parameter lists are typically considered code smell.

How long is too long? 

When we look at a parameter list and are unable to keep track of it all, then it's likely too long.

Mind's limit found - 4 things at once

Working memory relates to the information we can pay attention to and grasp. Keeping our parameter lists short helps others easily understand our function's purpose.

https://www.livescience.com/2493-mind-limit-4.html

Four parameters or fewer is the sweet spot, but seven is the maximum.

Consider our telephone numbers. How many digits? Seven. For example: 867-5309

Why do you think the seven digits are separated into two sets of numbers with the largest set having four digits?