What is the result of the comparison operator === if the operands are of different types?
- FALSE
- TRUE
- Undefined
- Error
The comparison operator === (strict equality) in JavaScript returns true if the operands are of different types and have the same value. JavaScript performs type coercion with ==, but === strictly checks both value and type.
What is the time complexity of the unshift() method in JavaScript arrays?
- O(n)
- O(1)
- O(log n)
- O(n log n)
The unshift() method in JavaScript arrays has a time complexity of O(n), where "n" represents the number of elements in the array. This is because it needs to shift all existing elements to make room for the new element at the beginning. The higher the number of elements, the longer it takes.
Which design pattern can be used to create a family of related or dependent objects without specifying their concrete classes?
- Factory Method Pattern
- Abstract Factory Pattern
- Singleton Pattern
- Prototype Pattern
The Abstract Factory Pattern allows you to create families of related or dependent objects without specifying their concrete classes. It provides an interface for creating objects in various categories while ensuring their compatibility within the family.
Which statement is true regarding function scope in JavaScript?
- Functions can access variables from outer scopes.
- Variables declared inside functions have global scope.
- Variables declared inside functions have function scope.
- Variables declared inside functions are accessible only within that function's block.
In JavaScript, variables declared inside functions have function scope, meaning they are only accessible within that function. This is important for encapsulation and avoiding variable conflicts. Variables declared outside of functions have global scope, and functions can access variables from outer scopes, but the reverse is not true.
The _________ event does not necessarily have to be attached to a form element.
- submit
- reset
- change
- keydown
The change event in JavaScript doesn't necessarily have to be attached to a form element. It can also be used with other HTML elements like ,