typescript code snippets 03

function returnNever(i: number): never {
  // Logic here
  if (i === 0) {
    throw Error("i is zero");
  } else {
    throw Error("i is not zero");
  }
  // Will never reach the end of the function
}

//-----------------------------------------//
type myUnion = "a" | "b";
function elseNever(value: myUnion) {
  if (value === "a") {
    value; // type is “a”
  } else if (value === "b") {
    value; // type is “b”
  } else {
    value; // type is never
  }
}
// enforcing types in a List
let arrayWithSquareBrackets: number[] = [1, 2, 3];
let arrayWithObject: Array<number> = [1, 2, 3];
let arrayWithObjectNew: Array<number> = new Array<number>(1, 2, 3);

let arrayWithSquareBrackets2: (number | string)[] = [1, 2, "one", "two"];
let arrayWithObject2: Array<number | string> = [1, 2, "one", "two"];