Understanding Functional Programming Concepts

What is a list comprehension in Python?

• A list comprehension is a method for sorting lists in Python.

• A list comprehension is a type of loop used for iterating over lists.

• A list comprehension is a built-in function for modifying existing lists.

• A list comprehension is a syntactic construct for creating lists in a clear and concise way.

How do you create a list using the map() function?

• Use map() to apply a function to each item in an iterable and convert the result to a list.

• You cannot convert the result of map() to a list.

• map() can only be used with numeric values.

• Use map() to create a dictionary from an iterable.

Explain the purpose of the filter() function.

• The filter() function combines elements of an array into a single value.

• The filter() function is used to sort elements of an array.

• The filter() function removes all elements from an array regardless of conditions.

• The purpose of the filter() function is to filter elements of an array based on a specified condition.

What does the lambda keyword do in Python?

• Creates anonymous functions.

• Defines a variable type.

• Generates random numbers.

• Creates a new class.

Provide an example of a simple list comprehension.

• [x - 3 for x in range(5)]

• [x**2 for x in range(5)]

• [x / 2 for x in range(5)]

• [x + 1 for x in range(5)]

How can you use map() to square a list of numbers?

• list(map(lambda x: x**2, numbers))

• map(lambda x: x**2, numbers)

• list(map(lambda x: x*2, numbers))

• numbers.map(lambda x: x**2)

What is the output of filter() when applied to a list of even numbers?

• A list of random numbers

• An empty list

• A list of odd numbers

• The same list of even numbers

Describe a scenario where lambda functions are useful.

• Using lambda functions to create a new class definition.

• Using lambda functions to read data from a file.

• Using lambda functions to sort a list of tuples by the second element.

• Using lambda functions to handle exceptions in a try-except block.

How do you combine map() and filter() in a single expression?

• array.filter(transformation).map(condition)

• array.filter(condition).map(transformation)

• array.map(condition).filter(transformation)

• array.map(transformation).filter(condition)

What is the difference between a regular function and a lambda function?

• Regular functions cannot return values while lambda functions can.

• A lambda function can have multiple names and is always defined with a keyword.

• A regular function is named and can contain multiple expressions; a lambda function is anonymous and limited to a single expression.

• A regular function is always shorter than a lambda function.