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TypeScript offers powerful tools that help you write clean, scalable, and type-safe code. Two of the most useful features in this toolkit are Union Types and Type Aliases.
In my latest YouTube video, I break down how to use these features effectively—even if you're just getting started with TypeScript.
What You'll Learn
If you've ever found yourself repeating types or making your code harder to read, Union Types let you define a variable that accepts multiple types:
let id: string | number;
Meanwhile, Type Aliases allow you to give a custom name to a type:
type ID = string | number;
function printId(id: ID) {
console.log("Your ID is:", id);
}
Combined, they make your code more readable, reusable, and easier to maintain.
? Real-World Example
type SuccessResponse = {
status: "success";
data: string;
};
type ErrorResponse = {
status: "error";
error: string;
};
type APIResponse = SuccessResponse | ErrorResponse;
function handleResponse(res: APIResponse) {
if (res.status === "success") {
console.log(res.data);
} else {
console.error(res.error);
}
}
This is a clean, scalable way to handle multiple response types from an API.
? Watch the Full Video
I walk you through all this and more in the full tutorial on YouTube:
?
? Final Thoughts
Whether you're building a small project or working with a large team, learning how to use Union Types and Type Aliases will make your TypeScript code more maintainable and developer-friendly.
If you find the video helpful, don’t forget to like, comment, and subscribe for more content like this!
In my latest YouTube video, I break down how to use these features effectively—even if you're just getting started with TypeScript.
What You'll Learn- What is a Union Type in TypeScript?
- How to use Union Types with function parameters
- What is a Type Alias and how to use it
- How to combine Union Types and Aliases
- Real-world use cases and code walkthroughs
- Common mistakes to avoid
If you've ever found yourself repeating types or making your code harder to read, Union Types let you define a variable that accepts multiple types:
let id: string | number;
Meanwhile, Type Aliases allow you to give a custom name to a type:
type ID = string | number;
function printId(id: ID) {
console.log("Your ID is:", id);
}
Combined, they make your code more readable, reusable, and easier to maintain.
? Real-World Example
type SuccessResponse = {
status: "success";
data: string;
};
type ErrorResponse = {
status: "error";
error: string;
};
type APIResponse = SuccessResponse | ErrorResponse;
function handleResponse(res: APIResponse) {
if (res.status === "success") {
console.log(res.data);
} else {
console.error(res.error);
}
}
This is a clean, scalable way to handle multiple response types from an API.
? Watch the Full Video
I walk you through all this and more in the full tutorial on YouTube:
?
? Final Thoughts
Whether you're building a small project or working with a large team, learning how to use Union Types and Type Aliases will make your TypeScript code more maintainable and developer-friendly.
If you find the video helpful, don’t forget to like, comment, and subscribe for more content like this!