typeof Operator: Returns a string indicating the type of its operand.

console.log(typeof 42);         // "number"
console.log(typeof "hello");    // "string"
console.log(typeof true);       // "boolean"
console.log(typeof undefined);  // "undefined"
console.log(typeof null);       // "object" (a known quirk in JavaScript)
console.log(typeof {});         // "object"
console.log(typeof []);         // "object" (arrays are a type of object)
console.log(typeof function(){});// "function"

instanceof Operator: Checks if an object is an instance of a particular class or constructor function. Returns true or false.

let arr = [];
let date = new Date();

console.log(arr instanceof Array);   // true
console.log(date instanceof Date);   // true
console.log(date instanceof Object); // true (Date inherits from Object)
console.log(arr instanceof Date);    // false

delete Operator: Removes a property from an object. It does not affect variables or functions declared with var, let, or const directly.

let user = { name: "Alice", age: 30 };
console.log(user.age); // 30

delete user.age;
console.log(user.age); // undefined
console.log(user);     // { name: "Alice" }

let globalVar = 10;
delete globalVar; // In strict mode, this throws an error. In non-strict mode, it returns false (cannot delete non-configurable properties).

The delete operator is primarily used for object properties. Using it on array elements will leave an undefined hole in the array, not re-index it.