Style-MapIntoArray.md

Pattern: Missing use of map

Issue: -

Description

Checks for usages of each with <<, push, or append which can be replaced by map.

If PreferredMethods is configured for map in Style/CollectionMethods, this cop uses the specified method for replacement.

Examples

# bad
dest = []
src.each { |e| dest << e * 2 }
dest

# good
dest = src.map { |e| e * 2 }

# good - contains another operation
dest = []
src.each { |e| dest << e * 2; puts e }
dest

Further Reading

• RuboCop - Style/MapIntoArray