TypeScript Function Whose Parameter Should Accept One Of Two Types
4 Answers Try using type assertions like casting on the parameter so the compiler and IDE treats it as the appropriate type once you ve determined which type it is interface A a string title string interface B b number title string const alpha data A gt data a const beta data B gt data b const foo data
Can I Specify Parameter Type As One Of Many Types Instead Of Any Type , Typescript 1 4 introduced Union Types so the answer now is yes you can Using other type than the ones specified will trigger a compile time error If you want an array of multiple specific types you can use Union Types for that as well Note that this is different from what OP asked for
TypeScript Documentation Advanced Types
Nullable types TypeScript has two special types null and undefined that have the values null and undefined respectively We mentioned these briefly in the Basic Types section By default the type checker considers null and undefined assignable to anything
TypeScript Documentation Type Compatibility, Type compatibility in TypeScript is based on structural subtyping Structural typing is a way of relating types based solely on their members This is in contrast with nominal typing Consider the following code interface Pet name string class Dog name string let pet Pet pet new Dog
Extending Object like Types With Interfaces In TypeScript
Extending Object like Types With Interfaces In TypeScript, Learn more by reading up on powerful type options in TypeScript Leveraging interfaces with generics in TypeScript In TypeScript generics enable us to create reusable code that works with multiple data types Using interfaces with generics in TypeScript is a flexible approach to creating reusable and type safe components and
TypeScript Utility Types Partial And Required
TypeScript Union Types Defining Multiple Types Become
TypeScript Union Types Defining Multiple Types Become TypeScript allows you to define multiple types The terminology for this is union types and it allows you to define a variable as a string or a number or an array or an object etc We can create union types by using the pipe symbol between each type let random string number Date Blob
Using Pick In TypeScript To Simplify Types And Interfaces Ultimate
Union types Union types in TypeScript allow you to define a value that can be multiple types However when attempting to cast a union type with the as operator it is required that the desired type be one of the constituent types of the union If the desired type is not included in the union TypeScript won t allow the casting operation How To Perform Type Casting In TypeScript LogRocket Blog. Object types in TypeScript define the structure and behavior of objects They can be defined using interfaces and are used to enforce type safety in variables parameters and return types Object types enable better code maintenance and understanding by catching errors at compile time ADVERTISEMENT TypeScript is a typed language that allows you to specify the type of variables function parameters returned values and object properties Here an advanced TypeScript Types sheet with examples Let s dive in Intersection Types Union Types Generic Types Utility Types
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