Tuple

Tuples are a type of variable that has a specific structure. Structurally, a tuple is an array of two elements; both are a known type by the compiler and the user, but those elements don't need to have the same type:

let person: [string, number];
person = ['Heitor', 31];

console.log(`My name is ${person[0]} and I am ${person[1]} years old`);

If you try to access an element outside of the known indices, you will get an error.