In programming languages, variables are used as placeholders for actual data values. For example, in a block of code, a developer might write x=5 and y=x+1. When the code is run, the computer will automatically change x and y to 5 and 6, respectively, to perform functions on them. Data can be of different types, such as a string of text, a number, or a date. This is why most programming languages allow you to define the type of a variable. Once you define a variable type, it doesn’t change; you can’t store numbers in string variables.

For example, if you tell a program that x and y are numbers, and then perform the x+y operation, the computer will know to get two numbers and add them up. On the other hand, if you define x and y as strings, the + operator will add the two strings together to create a longer word.

Weakly Typed Language

JavaScript is a weakly typed language, which means that it does not allow the programmer to define the type of a variable. At runtime, a variable can store any type of data, and operations take the type of the variable. The result can also be cast to a different data type (e.g., an operation can return the result as string 5 instead of number 5). This can lead to occasional coding errors and code bugs due to the wrong type.

What is TypeScript?

TypeScript is a programming language that improves JavaScript by adding types to the syntax. TypeScript adds additional syntax to JavaScript so that code editor tools can detect coding errors early on. At the same time, TypeScript code converts to JavaScript and provides all the same benefits as JavaScript. It also works in applications and with JavaScript frameworks and libraries.

What is the AWS SDK for JavaScript?

The AWS SDK for JavaScript is a set of free, open-source JavaScript libraries for integration with AWS services. They support API development, higher-level abstractions, and three types of applications:

React Native for mobile app development.

AWS SDK for JavaScript is written entirely in TypeScript and then compiled into JavaScript. This way, you get all the benefits of TypeScript without worrying about backward compatibility.

You can get started with the AWS SDK for Java by reading the code examples and migration guide or by installing it directly from GitHub.

What is AWS Amplify for JavaScript?

AWS Amplify is a set of purpose-built tools and features that enable mobile and web application UI developers to quickly and easily build full-featured applications on AWS. Amplify’s open-source client libraries provide use-case-oriented, easy-to-use interfaces for various categories of cloud-enabled operations.