JavaScript || DSA

let arr = [1, 2, 3];
arr[10] = 42;

console.log(arr.length);
console.log(arr[6]);

function test() {
  console.log(a);
  var a = 10;
  console.log(a);
}

test();

let x = {
  value: 10,
  toString() {
    return this.value++;
  },
};

if (x == 10 && x == 11) {
  console.log("It works!");
}

console.log("5" - 1);
console.log("5" + 1);
console.log("5" * 2);
console.log("5" / "2");
console.log("five" * 2);

let foo = { n: 1 };
let bar = foo;
bar.n = 2;

console.log(foo.n);

function example(a, b = a) {
  console.log(a + b);
}

example(2);
example(2, 3);

let a = {};
let b = a;

console.log(a === b);

a = null;

console.log(b === null);

let obj = {
  1: "one",
  0: "zero",
  true: "truthy",
  false: "falsy",
};

console.log(obj[1]);
console.log(obj["1"]);
console.log(obj[true]);

console.log(typeof null);
console.log(null instanceof Object);

function greet() {
  return "Hello" || "Hi";
}

function greet2() {
  return "Hello" && "Hi";
}

console.log(greet());
console.log(greet2());