TypeScript Map: A Complete Guide

TypeScript Map: A Complete Guide

TypeScript map is a new data structure that allows us to store data in a key-value pair and remembers the original insertion order of the keys.

TypeScript map is a new data structure that allows us to store data in the key-value pair and remembers the original insertion order of the keys. In the TypeScript map, we can use any value either as a key or as a value.

Understanding TypeScript map

With ES6 Map and Set were introduced into JavaScript. They finally bring more sophisticated data structures to your web applications. Because of that, they are a very welcome addition to the language.  For too long, arrays have been forced to solve every single problem that is out there.

A map in TypeScript is a data structure that contains key-value pairs. In this context, it is a bit like a Javascript object, but there are some significant differences:

  1. The keys aren’t limited to strings, numbers, and symbols.
  2. The map is a collection, meaning it has a size, an order, and can be iterated over.
  3. The maps are designed to deal with optional keys instead of with required keys. This is more important when using TypeScript and ensuring type safety.

How to create a Map in TypeScript

To create a map in TypeScript, use the following syntax.

let xmap = new Map();

To set a key-value in map, use map.set() function.

// app.ts

let xmap = new Map();

xmap.set('name', 'Krunal');
console.log(xmap);

Go to the terminal where this file is and run the following command.

tsc --target es6 app.ts

Here, if we don’t add –target flag, then we will get an error because it won’t be compatible with ES6. So, we have to add this flag to avoid any error.

After running the command, you will see the new file is created called app.js and now run that file to get the output.

node app
Output

typescript javascript app.js

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