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typescript narrowing object

Stupid Scarab answered on June 10, 2022 Popularity 3/10 Helpfulness 1/10

answer typescript narrowing object

typescript narrowing object

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type Fish = { swim: () => void };
type Bird = { fly: () => void };
 
function move(animal: Fish | Bird) {
  if ("swim" in animal) { // in operator narrowing
    return animal.swim();
  }
  return animal.fly();
}

Popularity 3/10 Helpfulness 1/10 Language typescript

Source: Grepper

Tags: narrowing object typescript

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Contributed on Jun 10 2022

Stupid Scarab

0 Answers Avg Quality 2/10

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