ES6 Maps

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Information Technology (IT), Architecture, Geography, Science
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University
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key feature of Maps that differentiates them from object literals?
Maps are immutable.
Maps can only use strings as keys.
Maps allow any data type to be used as a key.
Maps do not support key-value pairs.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you retrieve a value from a Map using a key?
Using the search method.
Using the get method.
Using the find method.
Using the locate method.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method is used to determine the number of entries in a Map?
size()
entries()
length()
count()
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What loop can be used to iterate over both keys and values in a Map?
while
for...of
for...each
for...in
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you iterate over just the keys of a Map?
Using map.keys() with a for...of loop.
Using map.values() with a for...of loop.
Using map.entries() with a for...of loop.
Using map.get() with a for...of loop.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method is used to convert a Map into an array of key-value pairs?
Array.toMap()
Array.from()
Map.fromArray()
Map.toArray()
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of converting a Map to an array using Array.from(map.values())?
An array of objects.
An array of key-value pairs.
An array of values.
An array of keys.
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