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array.js
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429 lines (333 loc) · 9.23 KB
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/**
* -------------------------- ARRAY IN JAVASCRIPT ----------------------------
*/
// ----------------------------------------------------------------------------
/**
* TEST : WAP to create a table of any number.
*/
// let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
// function Table(n){
// let table = arr.map((e)=> e*n)
// console.log(`Table of ${n}`)
// table.forEach((element) => {
// console.log(element)
// });
// }
// Table(132)
// ----------------------------------------------------------------------------
/**
* TEST : WAP to get even or odd numbers from the array list
*/
// let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
// // For getting all even numbers from the array list
// const Even = () => {
// let even = arr.filter((e) => e % 2 == 0);
// console.log(even);
// };
// // Even()
// // For getting all odd numbers from the array list
// const Odd = () => {
// let odd = arr.filter((e) => e % 2 == 1);
// console.log(odd);
// };
// // Odd()
// // ----------> Advance method
// function get(numType){
// let result = arr.filter((e) => {
// if (numType == "even") {
// return e % 2 == 0
// }
// else
// if (numType == "odd") {
// return e % 2 == 1
// }
// });
// if (numType == "even" || numType =="odd"){
// console.log(result);
// }
// else {
// console.log("Please enter a valid type!")
// }
// }
// get("even")
// get("odd")
// get("red")
// ----------------------------------------------------------------------------
/**
* TEST : Create counting table upto 100 using the array list of 10 elements
*/
// let arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
// let arr2 = arr1.map((e) => e + 10);
// let arr3 = arr2.map((e) => e + 10);
// let arr4 = arr3.map((e) => e + 10);
// let arr5 = arr4.map((e) => e + 10);
// let arr6 = arr5.map((e) => e + 10);
// let arr7 = arr6.map((e) => e + 10);
// let arr8 = arr7.map((e) => e + 10);
// let arr9 = arr8.map((e) => e + 10);
// let arr10 = arr9.map((e) => e + 10);
// let finalArr = arr1.concat(...arr2,arr3,arr4,arr5,arr6,arr7,arr8,arr9,arr10);
// console.log(finalArr)
/**
* NOTE : For concatanation I used (...)spread operator
*/
// ----------------------------------------------------------------------------
/**
* TEST : Insertion in Array
*/
// ------> Inserting in a empty array
// let arr = []
// function insert (...val){
// arr.push(...val)
// }
// insert("Hello", "World", "!")
// console.log(arr)
// ------> Inserting in a existing array
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// const add = (...value)=>{
// studentName.push(...value)
// }
// add("Sanjeev", "Kumar", "Suraj")
// const addBegin = (...value)=>{
// studentName.unshift(...value)
// }
// addBegin("Aditi", "Nandini", "Sneha")
// console.log(studentName)
/**
* NOTE : Using spread operator you can insert multiple values
*/
// ----------------------------------------------------------------------------
/**
* TEST : Deletation in Array
*/
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// function remove (n){
// for (let i = 0; i < n; i++) {
// studentName.pop()
// }
// }
// remove(4)
// console.log(studentName)
// ------> Advanced
// function remove (n){
// if (n <= studentName.length && n >= 0) {
// for (let i = 0; i < n; i++) {
// studentName.pop()
// }
// console.log(studentName)
// }
// else {
// console.log("Please enter lesser value than the array length")
// }
// }
// remove(2)
// // ------> Deletation using SHIFT
// function removeBegin (n){
// for (let i = 0; i < n; i++) {
// studentName.shift()
// }
// }
// removeBegin(1)
// console.log(studentName)
// // ------> Advanced code
// function removeBegin (n){
// if (n <= studentName.length) {
// for (let i = 0; i < n; i++) {
// studentName.shift()
// }
// console.log(studentName)
// }
// else {
// console.log("Please enter lesser value than the array length")
// }
// }
// removeBegin(5)
// studentName.splice(2,5)
// ----------------------------------------------------------------------------
/**
* TEST : Basic methods in Array
*/
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// let getIndex = studentName.indexOf("Sanjay")
// console.log(getIndex)
// let getValue = studentName[1]
// console.log(getValue)
// let sliced = studentName.slice(2, 3)
// console.log(sliced)
// ----------------------------------------------------------------------------
/**
* TEST : To replace any particular value from the array list
*/
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// studentName[2] = "King"
// studentName[0] = "VIAKSH"
// console.log(studentName)
// ----------------------------------------------------------------------------
/**
* TEST : Array destructuring
*/
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// let secondList = ["Ankush", "Sid"]
// -------> Merging two arrays
// studentName = [...studentName, ...secondList]
// studentName = studentName.concat(secondList)
// console.log(studentName)
// -------> Getting value
// let [a, b, ...rest] = studentName
// console.log(a)
// console.log(b)
// console.log(rest)
// let [x, y, , ,...other] = studentName
// console.log(x)
// console.log(y)
// console.log(other)
/**
* NOTE : A blank comma separation will skip value in Destructuring
*/
// ----------------------------------------------------------------------------
/**
* TEST : To change the CASE of elements in a array list
*/
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// function ToUpper (){
// let upper = studentName.map(e=> e.toUpperCase())
// console.log(upper)
// }
// ToUpper()
// function ToLower (){
// let lower = studentName.map(e=> e.toLowerCase())
// console.log(lower)
// }
// ToLower()
// ------> Case changing using single function
// let studentName = ["Vikash", "Anuj", "Shiv", "Rohit", "Sanjay"];
// function toCase(change){
// if(change == "UPPER"){
// let newlist = studentName.map(e=>e.toUpperCase())
// console.log(newlist)
// }
// else
// if(change == "LOWER"){
// let newlist = studentName.map(e=> e.toLowerCase())
// console.log(newlist)
// }
// else {
// console.log("Please enter a valid operation.")
// }
// }
// toCase("UPPER")
// toCase("LOWER")
// toCase("HYPER")
/**
* NOTE : We can't change the existing Array's string case
* but we can form new array using the old one.
*/
// ----------------------------------------------------------------------------
/**
* TEST : To change the CASE of elements in a dynamic array.
*/
let studentName = [];
function addStudent(...names) {
studentName.push(...names);
}
function toCase(change) {
if (change == "UPPER") {
let newlist = studentName.map((e) => e.toUpperCase());
console.log(newlist);
} else if (change == "LOWER") {
let newlist = studentName.map((e) => e.toLowerCase());
console.log(newlist);
} else {
console.log("Please enter a valid operation.");
}
}
// ------> Insert names here
addStudent("vikash", "rajiv", "sanjay", "hari")
// ------> Get your output value
toCase("UPPER");
// toCase("LOWER")
// toCase("HYPER")
// ----------------------------------------------------------------------------
/**
* TEST : Filtering candidate who can apply for goverment job
*/
// let candidate = [
// {
// name: "Vikash",
// age: 20
// },
// {
// name: "Alice",
// age: 25
// },
// {
// name: "Bob",
// age: 30
// },
// {
// name: "Charlie",
// age: 35
// },
// {
// name: "David",
// age: 40
// },
// {
// name: "Emily",
// age: 22
// },
// {
// name: "Frank",
// age: 28
// },
// {
// name: "Grace",
// age: 32
// }
// ];
// function candidateSelector (min, max){
// candidate.filter(e=>{
// if(e.age <= max && e.age >= min){
// console.log(`Name = ${e.name} | Age = ${e.age}`)
// }
// })
// }
// // Pass age range in the function
// candidateSelector(19, 33)
// ----------------------------------------------------------------------------
/**
* TEST : Print all values
*/
// let nums = [1, 2, 3, 4, 5, 6, 7, 8, 9];
// function getList(){
// nums.forEach((element,index)=>{
// console.log(`Value at index ${index} is ${element}`)
// })
// }
// getList()
// ----------------------------------------------------------------------------
/**
* TEST : Reverse array
*/
// let num = [1, 2, 3, 4, 5, 6, 7, 8, 9];
// By using reverse method
// function reverse (){
// let newNum = num.reverse()
// console.log(newNum)
// }
// reverse()
// By using for loop
// function reverse (){
// let newNum = []
// for (let i = num.length - 1; i >= 0; i--){
// newNum.push(num[i])
// }
// console.log(newNum)
// }
// reverse()
// ----------------------------------------------------------------------------
/**
* Exporting
*/
let array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
export default array;