How assignment compatibility is checked in Typescript - Try It Yourself

How assignment compatibility is checked

📖 Scenario: Imagine you are working on a TypeScript project where you need to assign values between different types. Understanding how TypeScript checks if one type can be assigned to another helps you avoid errors and write safer code.

🎯 Goal: You will create variables with different types and check how TypeScript allows or disallows assignments based on compatibility rules.

📋 What You'll Learn

Create variables with specific types

Create a helper variable to hold a value

Assign variables to each other to test compatibility

Print the results or comments about compatibility

💡 Why This Matters

🌍 Real World

In real projects, understanding assignment compatibility helps prevent bugs and ensures your code works as expected when variables interact.

💼 Career

Many programming jobs require writing safe and maintainable TypeScript code, so knowing how assignment compatibility works is essential.

1

Create variables with specific types

Create a variable called num of type number and set it to 10. Create a variable called str of type string and set it to "hello".

Typescript

// Create variables num and str with types number and string
// Your code here

Need a hint?

Use let keyword and specify types with : after variable names.

2

Create a helper variable to hold a value

Create a variable called value of type any and set it to num.

Typescript

let num: number = 10;
let str: string = "hello";
// Create variable value of type any and assign num to it
// Your code here

Need a hint?

The any type can hold any value without type errors.

3

Assign variables to test compatibility

Assign value to str. Then assign str to value. Use the exact code str = value; and value = str;.

Typescript

let num: number = 10;
let str: string = "hello";
let value: any = num;
// Assign value to str and str to value
// Your code here

Need a hint?

Because value is any, it can be assigned to str and vice versa.

4

Print the results

Write console.log(str); to print the value of str.

Typescript

let num: number = 10;
let str: string = "hello";
let value: any = num;
str = value;
value = str;
// Print str to console
// Your code here

Need a hint?

The output will be the value assigned to str after assignment.