- var set = new Set();
- document.writeln(“Size before invoking clear() method: “+ set.size+”<br>”);
- document.writeln(“Size after invoking clear() method: “+set.size);
Definition and Usage
The f metacharacter is used to find a form feed character. f returns the position where the form feed character was found. If no match is found, it returns -1.
What does Clear () do in Java?
clear() method is used to remove all the elements from a Set. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing Set.
Which of the following is the correct way to delete the object?
10. Which is the correct syntax to delete a single object? Explanation: The object to be deleted is mentioned after the keyword delete. This deletes the object from memory and free up the memory that was acquired by the object.
Why ! Is false?
! evaluates to false because the reference is truthy.  can be converted to an number (0 in this case) which is falsey. Therefore: the condition passes as equal.
How do you remove the property name from this object?
The delete operator is used to remove these keys, more commonly known as object properties, one at a time. The delete operator does not directly free memory, and it differs from simply assigning the value of null or undefined to a property, in that the property itself is removed from the object.
How do you clear a value in an ArrayList?
There are two ways to empty an ArrayList – By using ArrayList. clear() method or with the help of ArrayList. removeAll() method.
How do you check if an ArrayList is empty?
To check if an ArrayList is empty, you can use ArrayList. isEmpty() method or first check if the ArrayList is null, and if not null, check its size using ArrayList. size() method. The size of an empty ArrayList is zero.
How do you create an empty ArrayList?
The general syntax of this method is:
ArrayList<data_type> list_name = new ArrayList<>(); For Example, you can create a generic ArrayList of type String using the following statement. ArrayList<String> arraylist = new ArrayList<>(); This will create an empty ArrayList named ‘arraylist’ of type String.