Why is this an issue?

Functions with a long parameter list are difficult to use, as maintainers must figure out the role of each parameter and keep track of their position.

def modify(x1, y1, z1, x2, y2, z2) # Noncompliant
 # ...
end

The solution can be to:

• Split the function into smaller ones

# Each function does a part of what the original distance function was doing, so confusion risks are lower
def move(x, y, z)
   # ...
end

def resize(width, height, depth)
   # ...
end

• Find a better data structure for the parameters that group data in a way that makes sense for the specific application domain

Point = Struct.new(:x, :y, :z) # In geometry, Point is a logical structure to group data

def modify(p1, p2)
 # ...
end

This rule raises an issue when a function has more parameters than the provided threshold.