Lint-EachWithObjectArgument.md

Pattern: Immutable argument to each_with_object

Issue: -

Description

This rule checks if each_with_object is called with an immutable argument. Since the argument is the object that the given block shall make calls on to build something based on the enumerable that each_with_object iterates over, an immutable argument makes no sense.

Examples

# bad

sum = numbers.each_with_object(0) { |e, a| a += e }

# good

num = 0
sum = numbers.each_with_object(num) { |e, a| a += e }

Further Reading

• RuboCop - Lint/EachWithObjectArgument