Optional and Rest Parameters in functions of typescript
Автор: Techies Tute
Загружено: 2020-08-12
Просмотров: 185
TypeScript is a strong typed language. When we declare parameters for a function then all the parameters are required and client has to pass values to every parameter. When client has no value for any parameter then he can pass null value.
1. TypeScript provides a Optional parameters feature. By using Optional parameters featuers, we can declare some paramters in the function optional, so that client need not required to pass value to optional parameters.
2. When the number of parameters that a function will receive is not known or can vary, we can use rest parameters. In JavaScript, this is achieved with the "arguments" variable. However, with TypeScript, we can use the rest parameter denoted by ellipsis ....
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