Objects (dictionaries)

Question 1

Create an object

Answer 1

let obj = { key1: “value1”, key2: “value2” }

Question 2

Access value by key

Answer 2

obj.key1
obj[“key1”]

Question 3

Add or update key value pair

Answer 3

obj.key3 = “value3”

Question 4

Delete key value pair

Answer 4

delete obj.key1

Question 5

Check if key exists in object

Answer 5

‘key1’ in obj

Question 6

Get array of keys

Answer 6

Object.keys(obj)

Question 7

Get array of values from object

Answer 7

Object.values(obj)

Question 8

Loop through object

Answer 8

for (let key in obj) {
console.log(key)
}