Sometimes, we want to do method overloading in TypeScript.
In this article, we’ll look at how to do method overloading in TypeScript.
How to do method overloading in TypeScript?
To do method overloading in TypeScript, we can add multiple signatures for the same function.
For instance, we write
class C {
someMethod(stringParameter: string): void;
someMethod(numberParameter: number, stringParameter: string): void;
someMethod(stringOrNumberParameter: any, stringParameter?: string): void {
if (typeof stringOrNumberParameter === "number") {
//...
} else {
//...
}
}
}
to add multiple signatures for the someMethod method in the C class.
The first parameter can be a number or a string according to the signatures.
And the 2nd parameter is optional.
Then in someMethod, we check if stringOrNumberParameter is a number with typeof.
Conclusion
To do method overloading in TypeScript, we can add multiple signatures for the same function.
