Functions — github.com/Polkadot-Blockchain-Academy/pba-qualifier-exam

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Functions110 in github.com/Polkadot-Blockchain-Academy/pba-qualifier-exam

⨍ Functions 110◇ Types & classes 29

↓ 12 callersFunctionsanity_check

(f: &dyn Fn() -> char)

src/b_multiple_choice.rs:300

↓ 6 callersFunctionhas_honor

(f: &dyn Fn() -> bool)

src/a_honor_code.rs:74

Functionanswer_1_a

# Multiple Choice Questions This portion of the exam is to be completed without accessing the internet, books, the rust compiler, or any other resour

src/b_multiple_choice.rs:41

Functionanswer_1_a_sanity_check

()

src/b_multiple_choice.rs:309

Functionanswer_1_b

### Question 1_B Why can the variable `y` be reassigned in the last line when it was not declared as `mut`? - a) Mutable variables are the default.

src/b_multiple_choice.rs:54

Functionanswer_1_b_sanity_check

()

src/b_multiple_choice.rs:314

Functionanswer_1_c

### Question 1_C What is the value of `z` at the end of the program? - a) 1 - b) -1 - c) 4294967295 (u32 max value) - d) 0 - e) 511

src/b_multiple_choice.rs:67

Functionanswer_1_c_sanity_check

()

src/b_multiple_choice.rs:319

Functionanswer_1_d

### Question 1_D Which of the following is not a valid looping construct in Rust? - a) `do {} while x > 0` - b) `for _ in 1..2 {}` - c) `while x > 0

src/b_multiple_choice.rs:80

Functionanswer_1_d_sanity_check

()

src/b_multiple_choice.rs:324

Functionanswer_2

## Question 2 Consider this Rust code: ```notest /// Check whether a value is between 5 and 10, and return a user-readable /// string explaining the

src/b_multiple_choice.rs:112

Functionanswer_2_sanity_check

()

src/b_multiple_choice.rs:329

Functionanswer_3_a

## Question 3 Consider this Rust code when answering question 3: ```notest fn mystery(n: u32) -> Vec<u32> { let mut seq = Vec::new(); for k in 1..n

src/b_multiple_choice.rs:139

Functionanswer_3_a_sanity_check

()

src/b_multiple_choice.rs:334

Functionanswer_3_b

### Question 3_B Consider changing the range `1..n`. Which of the following would _not_ cause the loop to execute one additional time: - a) `1..=n`

src/b_multiple_choice.rs:153

Functionanswer_3_b_sanity_check

()

src/b_multiple_choice.rs:339

Functionanswer_4_a

## Question 4 Consider this Rust code when answering question 4: ```notest fn sort(items: &mut [u32]); ``` ### Question 4_A The signature above ma

src/b_multiple_choice.rs:174

Functionanswer_4_a_sanity_check

()

src/b_multiple_choice.rs:344

Functionanswer_4_b

### Question 4_B How would this signature need to change to sort arbitrary data? - a) `fn sort<T>(items: &mut [T])` - b) `fn sort<T: Ord>(items: &mu

src/b_multiple_choice.rs:187

Functionanswer_4_b_sanity_check

()

src/b_multiple_choice.rs:349

Functionanswer_5

## Question 5 Which of the following tools is used to install Rust and manage Rust versions and components? - a) cargo - b) rustc - c) rustup - d) c

src/b_multiple_choice.rs:200

Functionanswer_5_sanity_check

()

src/b_multiple_choice.rs:354

Functionanswer_6

## Question 6 Consider this Rust code: ```notest struct Fraction { numerator: u32, denominator: u32, } impl From<u32> for Fraction { fn from(n: u32

src/b_multiple_choice.rs:236

Functionanswer_6_sanity_check

()

src/b_multiple_choice.rs:359

Functionanswer_7

## Question 7 Consider this Rust code: ```notest use std::num::ParseIntError; enum OutOfRangeError { TooLarge, TooSmall, NotEvenANumber, } impl Fr

src/b_multiple_choice.rs:279

Functionanswer_7_sanity_check

()

src/b_multiple_choice.rs:364

Functionbounded_absolute_values

This function takes an iterator of i32 values, calculates the absolute value of each, and throws away any values that are greater than 100. The remain

src/f_iterators.rs:20

Functionbounded_absolute_values_1

()

src/f_iterators.rs:94

(&self, other: &Self)

src/e_common_traits.rs:42

Functioncoding_no_ai_helpers

You are not allowed to use AI assisted coding tools like Github Copilot to complete this exam.

src/a_honor_code.rs:65

Functioncoding_no_copy

The coding portion of the exam allows access to books, and websites such as the Rust book, the standard library reference, and others _explicitly list

src/a_honor_code.rs:52

Functioncoding_no_external_deps

You are not allowed to use external dependencies from `crates.io` or elsewhere unless explicitly stated in the problem.

src/a_honor_code.rs:59

Functioncustom_mixed_1

()

src/h_advanced_traits.rs:342

Methoddefault

()

src/m_builder.rs:47

Functionemployee_from_string_success

()

src/e_common_traits.rs:91

Functionemployee_neq

()

src/e_common_traits.rs:134

Functionemployee_ord

()

src/e_common_traits.rs:116

Functionemployee_to_string_success

()

src/e_common_traits.rs:104

Methodenergy_density

()

src/h_advanced_traits.rs:58

Methodeq

(&self, other: &Self)

src/e_common_traits.rs:24

Functionexam_done_independently

This portion of the exam represents an honor code. By returning `true` from each of these functions you are attesting that you have followed the vario

src/a_honor_code.rs:13

Methodexperience

(self, experience: u32)

src/m_builder.rs:66

Functionextension_trait

()

src/i_extension_traits.rs:89

Functionfibonacci_1

()

src/f_iterators.rs:131

Functionfirst_n_even

(mut vals: impl Iterator<Item = u32>)

src/f_iterators.rs:36

Functionfirst_n_even_1

()

src/f_iterators.rs:105

Functionfirst_n_even_2

()

src/f_iterators.rs:113

Methodfrom

(e: Employee)

src/e_common_traits.rs:68

Methodfrom

(j: Joule)

src/h_advanced_traits.rs:19

Methodget

()

src/k_macros.rs:50

Functionhonor_code_respected

()

src/a_honor_code.rs:82

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/k_macros.rs:65

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/m_builder.rs:184

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/b_multiple_choice.rs:286

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/f_iterators.rs:72

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/e_common_traits.rs:76

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/i_extension_traits.rs:65

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/d_pattern_matching.rs:30

Functionhow_hard_was_this_section

This function is not graded. It is just for collecting feedback. On a scale from 0 - 255, with zero being extremely easy and 255 being extremely hard,

src/h_advanced_traits.rs:254

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/k_macros.rs:71

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/m_builder.rs:190

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/b_multiple_choice.rs:292

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/f_iterators.rs:78

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/e_common_traits.rs:82

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/i_extension_traits.rs:71

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/d_pattern_matching.rs:36

Functionhow_many_hours_did_you_spend_on_this_section

This function is not graded. It is just for collecting feedback. How much time (in hours) did you spend on this section of the exam?

src/h_advanced_traits.rs:260

Functioni_dont_know_count

(outcomes: Vec<Outcome>)

src/i_extension_traits.rs:28

Methodi_dont_know_count

(&self)

src/i_extension_traits.rs:52

Functionic_1

()

src/h_advanced_traits.rs:294

Complete the following functions using the pattern matching syntax. That includes the `match` statement of the `matches!()` macro, if you feel like ha

src/d_pattern_matching.rs:8

Functionmatch_2

Returns true if the first and last string in the vector start with `PBA`.

src/d_pattern_matching.rs:13

Functionmatch_3

Returns true if the first item in `input` is true.

src/d_pattern_matching.rs:18

Functionmatch_4

Returns true if the input is `Ok(x)` of some even `x`.

src/d_pattern_matching.rs:23

Functionmixed_1

()

src/h_advanced_traits.rs:334

Functionmultiple_choice_closed_book

The multiple choice portion of the exam must be completed without accessing the internet, books, or any other resources.

src/a_honor_code.rs:20

Functionmultiple_choice_no_run

The multiple choice portion of this exam has several questions asking for the output of a particular programs. It also has questions asking what chang

src/a_honor_code.rs:31

src/h_advanced_traits.rs:92

Methodnext

(&mut self)

src/f_iterators.rs:64

Functionnuclear

()

src/h_advanced_traits.rs:279

Functionok_count

(outcomes: Vec<Outcome>)

src/i_extension_traits.rs:22

Methodok_count

(&self)

src/i_extension_traits.rs:49

Functionomni_1

()

src/h_advanced_traits.rs:315

Functionomni_80_energy

A function that returns the energy produced by the `OmniGenerator` with efficiency of 80%, when the fuel type is an even a mix of `Diesel` as `Lithium

src/h_advanced_traits.rs:212

Methodpartial_cmp

(&self, other: &Self)

src/e_common_traits.rs:36

Functionprocess_stuff

(input: impl Iterator<Item = T>)

src/i_extension_traits.rs:13

Methodprovide_energy

(&self, f: FuelContainer<F>)

src/h_advanced_traits.rs:136

Methodprovide_energy_ideal

Same as [`ProvideEnergy::provide_energy_with_efficiency`], but with an efficiency of 100. This method must be provided as it will be the same in all

src/h_advanced_traits.rs:128

Methodprovide_energy_with_efficiency

Convert the amount of fuel in `f` with an exact efficiency of `e`. NOTE: all efficiencies are interpreted as u8 values that can be at most 100, and r

src/h_advanced_traits.rs:121

Functionsimple_functions

()

src/i_extension_traits.rs:80

Functionsomething_went_wrong_count

(outcomes: Vec<Outcome>)

src/i_extension_traits.rs:25

Methodsomething_went_wrong_count

(&self)

src/i_extension_traits.rs:55

Functionsquare_whole_numbers

Return an "infinite" iterator that yields the squares of the whole numbers. For example, the first few values should be 0, 1, 4, 9, 16, 25, ... The i

src/f_iterators.rs:46

Functionsquare_whole_numbers_1

()

src/f_iterators.rs:123

Functionsum_of_squares

This portion of the exam tests your abilities to work with iterators and their functional-style methods. Throughout this portion of the test, you may

src/f_iterators.rs:13

Functionsum_of_squares_1

()

src/f_iterators.rs:87

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