Prefer Strict Generators

Within comprehensions, avoid <- and <= in favor of <:- and <:=.

Avoid

[ X || X <- a:list()],
<< <<X>> || X <= a:binary() >>
#{K => V || K := V <- a:map()}

Prefer

[ X || X <:- a:list()],
<< <<X>> || X <:= a:binary() >>
#{K => V || K := V <:- a:map()}

Rationale

Quoting OTP's official documentation:

Using strict generators is a better practice when either strict or relaxed generators work. More details are in Programming Examples.

Options

• None.

Example configuration

{elvis_style, prefer_strict_generators, #{}}