ES6 Maps

The video tutorial introduces maps in ECMAScript 6, explaining their structure as key-value pairs. It demonstrates creating maps, setting keys and values, and retrieving values using the get method. The tutorial covers iterating through maps using 'for of' and 'forEach' loops, and converting maps to arrays. The video concludes with a brief mention of sets, another new object type in ES6.

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.

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.

Which method is used to determine the number of entries in a Map?

• size()

• entries()

• length()

• count()

What loop can be used to iterate over both keys and values in a Map?

• while

• for...of

• for...each

• for...in

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.

Which method is used to convert a Map into an array of key-value pairs?

• Array.toMap()

• Array.from()

• Map.fromArray()

• Map.toArray()

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.