Optional Parameter Typescript

https://stackoverflow.com/questions/30734509
12 Answers Sorted by 517 As specified in the documentation use undefined export interface INotificationService error message string title string autoHideAfter number class X error message string title string autoHideAfter number console log message title autoHideAfter

https://stackoverflow.com/questions/43159887
Return input nickname input nickname input name Basically you remove the nickname property from the interface and re add it as optional If you want to make sure to keep it in sync with the original interface you can do Omit Partial

https://www.typescriptlang.org/docs/handbook/functions.html
In JavaScript every parameter is optional and users may leave them off as they see fit When they do their value is undefined We can get this functionality in TypeScript by adding a to the end of parameters we want to be optional For example let s say we want the last name parameter from above to be optional

https://bobbyhadz.com/blog/typescript-function-optional-parameters
Setting optional parameters in Functions using TypeScript Use a question mark to set an optional parameter in a function in TypeScript If set to optional the parameter can have a type of undefined or the specified type because unspecified parameters get the value undefined

https://stackoverflow.com/questions/60913446
You could use an object to pass your parameters or something like streets key string string console log street1 street1 console log street2 street2 console log street3 street3

https://www.geeksforgeeks.org/typescript-optional-parameters
TypeScript Optional Parameters are used for making parameters optional In Typescript represents optional parameters We use optional parameters when it s not mandatory for that parameter to have a value or to be specified Even if a function specifies parameters you can call it without giving any arguments in JavaScript

https://timmousk.com/blog/typescript-optional-parameters
In TypeScript to create a function with an optional parameter you need to use a question mark after the parameter declaration like so typescript const getFullName firstName string lastName string string if lastName return firstName return firstName lastName

https://stackinterface.com/typescript-optional-parameters
In TypeScript optional parameters allow you to specify that a function parameter may be omitted when calling the function You denote optional parameters by adding a question mark after the parameter name in the function declaration

https://byby.dev/ts-function-parameters
TypeScript function parameters allow you to define the types of the values that are passed into a function which helps with type checking and improves code clarity In addition to basic parameter syntax TypeScript supports optional and default parameters as well as nullable types