Map Number Record For Free

Map is a data class in JS that can use any kind of object as a key, while Record is just a type definition that describes an object, where the keys have to be JS object keys (string, number, or symbol).

A record is instantiated by the new keyword, just like creating any other objects in Java. The data in the record is held in private final fields and there is only a getter method. Therefore, data in the record is immutable. A record cannot inherit another class.

A record is analogous to an Object in JavaScript with the exception that the Record is not an Object but a deeply immutable primitive value. Likewise, a Tuple is like an Array but is a deeply immutable primitive value.

The difference is set is used to store only keys while map is used to store key value pairs. For example consider in the problem of printing sorted distinct elements, we use set as there is value needed for a key.

Approach 1: Using array. from() Method Declare a new map object. Display the map content. Use the keys() method on Map Object to get the keys of Map. Then use the array. from() method to convert a map object to an array.

In conclusion, TypeScript Record and Map are powerful tools for storing and accessing data in TypeScript. TypeScript Record is useful for storing a fixed set of keys with specific types, while Map is useful for storing any type of key-value pair and offers better performance for large datasets.

Unlike object types such as Record, a Map can store any type of value including objects, functions, and other primitives. We can create a new Map instance using the Map constructor. let myMap = new Map<string, number>(); Then we can add, update or delete entries from the Map using its inbuilt methods.