This content originally appeared on DEV Community and was authored by Dennis kinuthia
While writing a custom table component for react i ran into an interesting issue .
The table takes in props like and array of objects that define the header and column of the table and an array of objects for the rows , with those props the component is able to render a table .
But the point of writing a custom table is to add features not available in a regular html table , so i needed to pass in functions to handle the editing which are optional since they'd only need to be used when the table is in edit mode
Normally in typescript when you have a possibly undefined variable yon can use
interface Types{
person?:{name: string , age: number}
}
const age = person?.age
This helps you avoid the cannot access .age of undefined error that normally breaks your code. This implementation won't try to access the variable if it's undefined
Something like that exists for functions enabling you to have possibly undefined functions without the function cannot be undefined error
interface Types{
person?:{name: string , age: number}
sayHello?:(name: string)=>void
}
// Then execute the function like this
sayHello.?(person?.name)
This content originally appeared on DEV Community and was authored by Dennis kinuthia
Dennis kinuthia | Sciencx (2022-07-14T01:32:58+00:00) Today i found out : optional typescript function props. Retrieved from https://www.scien.cx/2022/07/14/today-i-found-out-optional-typescript-function-props/
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