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// splice
// slice
// last index of
// index of

// splice method
// parameters (1st - position start , 2nd - how many element should be replace , 3rd - this element will be added as the new element)
// const arr = [1, 2, 3, 4, 5, 6, 7, 8];
// arr.splice(3, 2, 33, 23);
// console.log(arr)

// slice method
// create another array by giving the new array 
// slice(1st - starting index , 2nd - end  index)
// const arr1 = [1, 2, 3, 4, 5, 6, 7, 8];
// const a = arr1.slice(0, 3);
// console.log(arr1);
// console.log(a);

// index of - find the first index of duplicates element of
// indexing start from 0,1,2,3,4.......
// const arr1 = [1, 2, 3, 4, 5, 6, 7, 8];
// const a  = arr1.indexOf(4);
// console.log(a)

// last index of - find the last index of duplicates function
// const arr1 = [1, 2, 3, 4, 5, 6, 7, 5, 8 , 5];
// const a = arr1.indexOf(5);
// const b = arr1.lastIndexOf(5);
// console.log(a)
// console.log(b)





// callback function 
// passing a function as an argument to the another function and calling this from that another function
// function hello() {
//     console.log("hello")
// }
// function greet(x) {
//     console.log("welcome");
//     x();
// }
// greet(hello)


// higher order function
// that function which takes function as an argument or return function from it are called higher order function
// in this case function greet is taking hello function as an argument , so it is a higher order function
// function hello() {
//     console.log("hello")
// }
// function greet(x) {
//     console.log("welcome");
//     x();
// }
// greet(hello)

// function hii() {
//     return 45456;
//     console.log("first")
// }
// function hii() {
//     return function () {
//         return function () {
//             return function () {
//                 console.log("function inside function");
//             }
//         }
//     }
// }
// const a = hii();
// const b = a();
// const c = b();
// c()