In JavaScript, many libraries use string arguments to change behavior. In this lesson we learn how Typescript catches string related errors at compile time by assigning a string literal as a type.

  1. type whiteList = "DOG" | "CAT" | "BIRD";
  2. function allowToTake(num: number, animal: whiteList): string{
  3.   return `You can bring ${num} ${animal}`;
  4. }

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