TypeScript for React Native: A Complete Beginner’s Guide 🚀

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In this article we will see the beginner’s guide of Typescript to start with an Awesome framework called React Native.

🚀 Variables

In typescript, variables will be declared by const and let keywords.

🔴 const

const name = "jayant"

variables declared with const cannot be reinitialised , value is initialised at compile time only.

If you try to re-assigned the value , you will get the compile time error.

🔴 let

variables created with let , can be re-initialised later.

let age = 25;
age = 26;

We can also create variables with var keyword , but using var to declare variables in Typescript is considered bad practise.

There are multiples reasons but let’s understand by an example

🔴 var

function test_2() {
  if (true) {
    var x = 10;
  }
  console.log(x)
}

As you see in the above code , we defined the x variable inside the if-block but it is accessible outside the block , this can lead an unexpected behaviour when working with loops or conditions.

🚀 Data Types