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I like to use typescript interfaces for function properties, But I like to use default properties as well. How can I use both?

export interface test_interface{
   owner: string, 
   length?: number, 
   max_players?: number,
}
const test_function = (test_props: test_interface) => {
    const x = test_props.length; //could be undefined and I want a default value
}
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1 Answer 1

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You can accomplish this with destructuring in the function declaration.

export interface test_interface{
   owner: string, 
   length?: number, 
   max_players?: number,
}
const test_function = ({owner, length = 5, max_players = 4}: test_interface) => {
    const x = test_props.length; //length is 5 or whatever was passed in on the function call
}
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