let message = ‘helloWorld’ let convertedMessage=message.replace(/[A-Z]/g, letter => `_${letter.toLowerCase()}`); console.log(convertedMessage); output -> hello_world
Retriving a List of attribute (field) values from a Object List (Array List) List users=new ArrayList<>(); List userIds=users .stream() .map(u->u.getId()) .collect(Collectors.toList()); Filter Objects by Attribute