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Main Page → Exercises → Python → Solve an Exercise

functional_concepts

Language/Type: Python functional programming

Answer the following questions about functional programming. The third question refers to the following function double_all:

# Doubles the values of all elements in a list.
def double_all(a):
    for i in range(len(a)):
        a[i] = 2 * a[i]

The xth questionrefers to the following lambda code:

a = 1
b = 2
lambda b, c: c + b - a

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Why do functional programmers want to avoid side effects?
A side effect makes a function unable to be understood by the programmer. Side effects make a function run more slowly. Functions without side effects are easy to reason about, reuse, combine, and parallelize. Side effects are bugs that should never occur. (order shuffled)
Which of the following would be considered a side effect? (Check all that apply.)
Producing console output with the print() function. Writing data to a file. Returning a value. Modifying the value of a global variable. Modifying a parameter value by reference, such as a list. (order shuffled)
What side effect does the double_all function have?
It is not allowed to have a loop. It modifies the list that was passed in. Calling the range() function produces a side effect. It does not print the list at the end. (order shuffled)
What is the difference between a free variable and a bound variable?
They are the same. A bound variable is inside the lambda, and a free variable is declared outside the lambda. A bound variable is constant and a free variable can be changed. A bound variable is a simple type like int, and a free variable is an object. A bound variable is out of scope in a function. (order shuffled)
What are the free variables in the lambda function in the code? (Check all that apply.)
`a` `b (first one)` `b (second one)` `c` `none of the above`
What are the bound variables in the lambda function in the code? (Check all that apply.)
`a` `b (first one)` `b (second one)` `c` `none of the above`

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Main Page → Exercises → Python → Solve an Exercise

functional_concepts