how to check if an element is in a set in javascript

index.tsx
// create a new Set object with some elements
let mySet = new Set([1, 2, 3, "hello", "world"]);

// check if 2 is in the Set
if (mySet.has(2)) {
  console.log("2 is in the set");
}

// check if "foo" is in the Set
if (mySet.has("foo")) {
  console.log("foo is in the set");
} else {
  console.log("foo is not in the set");
}
325 chars
15 lines

index.tsx
// convert the Set to an array
let myArray = Array.from(mySet);

// check if 2 is in the array
if (myArray.includes(2)) {
  console.log("2 is in the set");
}

// check if "foo" is in the array
if (myArray.includes("foo")) {
  console.log("foo is in the set");
} else {
  console.log("foo is not in the set");
}
311 chars
15 lines