JSFunctions

Question 1

Map Methods

Using a Map, what functions would you need to:
1. Add something
2. Remove a value
3. Check if a key exists
4. Get an item by its key
5. Get all the items
6. Get all the key names
7. Get the length

Answer 1

1. map.set(key,value)
2. map.delete(key)
3. map.has(key)
4. map.get(key)
5. map.keys()
6. map.values()
7. map.size

Question 2

What is the time complexity of find()

Answer 2

O(n)

Question 3

What is the time complexity of findIndex()

Answer 3

O(n)

Question 4

What is the time complexity of sort()

Answer 4

Can depend on the browser, but O(n log n)

Question 5

What is the time complexity of splice()

Answer 5

O(n)

Question 6

What is the time complexity of slice()

Answer 6

O(n)

Question 7

What is the difference between slice() and splice()?

Answer 7

slice() returns a copy of the portion of an array into a new object. splice() is used to modify an array in place

Question 8

[Slice]Given a list like [‘a’,’b’,’c’,’d’], what would the following do

 list.slice(2) 
list.slice(1,2) 

Answer 8

 list.slice(2) // returns ['c','d'] 
list.slice(1,2) // returns['b','c']