Rust Programming Master Class from Beginner to Expert - Hash Maps

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Information Technology (IT), Architecture
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University
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Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key characteristic of keys in a hash map?
Keys can be duplicated.
Keys must be integers.
Keys are unique with no duplicates allowed.
Keys must be strings.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Rust, how do you declare a new empty hash map?
let person = new HashMap();
let person = HashMap::create();
let mut person = HashMap::initialize();
let mut person = HashMap::new();
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which function is used to access a value in a hash map by its key?
search()
locate()
get()
find()
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the contains_key function return?
A float
An integer
A string
A boolean
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you iterate over all key-value pairs in a hash map?
Using a while loop
Using a for loop
Using a repeat-until loop
Using a do-while loop
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might the order of elements change when iterating over a hash map?
Because hash maps are stored on the heap and not in contiguous locations.
Because hash maps are sorted by default.
Because hash maps are stored in contiguous memory locations.
Because hash maps are stored on the stack.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when you use the insert function on an existing key in a hash map?
The existing value is updated.
A new key is created.
The existing value is deleted.
Nothing happens.
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