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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. Functions without side effects are easy to reason about, reuse, combine, and parallelize. Side effects make a function run more slowly. Side effects are bugs that should never occur. (order shuffled)
Which of the following would be considered a side effect? (Check all that apply.)
Modifying a parameter value by reference, such as a list. Modifying the value of a global variable. Returning a value. Producing console output with the print() function. Writing data to a file. (order shuffled)
What side effect does the double_all function have?
Calling the range() function produces a side effect. It modifies the list that was passed in. It is not allowed to have a loop. It does not print the list at the end. (order shuffled)
What is the difference between a free variable and a bound variable?
A bound variable is a simple type like int, and a free variable is an object. A bound variable is constant and a free variable can be changed. They are the same. A bound variable is out of scope in a function. A bound variable is inside the lambda, and a free variable is declared outside the lambda. (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