Define lazily

Defining eagerly:

a = 1
dddd = a*2
bb = 1
ccc = bb + a

return bb + dddd

Defining lazily:

a = 1
bb = 1
ccc = bb + a

dddd = a*2
return bb + dddd

Reason: Defining lazily minimizes the number of definitions at each line of code.

The fewer definitions

The fewer variables in a programmer’s head

The faster the programmer can reason about the code

Note: a, bb, ccc, and dddd are bad variable names for real code, but they give order and shape to the point we’re making in this article.