Return multiple values in TypeScript Stack Overflow
The standard way to do this in JavaScript is to return an array containing the values source however as the values I want to return are of different types I get an error during compilation function fun return hello 1 let a b fun console log a substring 1 Error
TypeScript Documentation More on Functions, Description string someArg number boolean function doSomething fn DescribableFunction console log fn description returned fn 6 function myFunc someArg number return someArg 3 myFunc description default description doSomething myFunc
Return Multiple values from a Function in TypeScript bobbyhadz
Define a Function with multiple return Types in TypeScript We declared a function that returns multiple values by grouping them in an array Notice that the type of the result variable and the function s return type is bobbyhadz 100 The as const syntax is called a const assertion in TypeScript
TypeScript Documentation Type Compatibility, The type system enforces that the source function s return type be a subtype of the target type s return type Function Parameter Bivariance When comparing the types of function parameters assignment succeeds if either the source parameter is assignable to the target parameter or vice versa This is unsound because a caller might end up
TypeScript multiple return types with identical parameters
TypeScript multiple return types with identical parameters, However in the context of angular2 custom form validators a single signature one parameter of type FormControl can return two distinct types an Object with form errors or null to indicate the control has no errors This obviously does not work
Define Method Return Type According Class Received As Parameter In
Function Return Types TypeScript Nate Stephens
Function Return Types TypeScript Nate Stephens You should explicitly state a function s return type and TypeScript will then verify that your code implementation in fact matches your expectations function add a number b number Naming a function add and providing it with two numbers you d expect it d return a value of type number But here its inferred return type is void
TypeScript Function Types A Beginner s Guide
A possible solution what would fix your issue would be to add the generic parameters const value getResponse FooResponse Foo Foo key1 bar This changes are needed because you specified U as a generic parameter in the method but you didnt populate it when actually calling the function If you dont want to add the generic Typescript Function return subtype of a generic marker interface . However TypeScript has trouble correctly inferring the return type within the function implementation The compiler reports errors on lines 3 and 7 although the return type is correctly inferred on lines 14 and 15 when the function is called TypeScript playground The problem is that the type T is used in both the function signature and the 2 Array is not a type but type constructor Array SomeType is a type that is why you cannot say something returns type constructor it needs to return specific type If your function is polymorphic and can work with any array you can pass type generic argument to Array type constructor Consider following code
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