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‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 0. A. Hello, World.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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/**
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* A line of code that prints "Hello, World!" on a new line is provided in the editor.
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* Write a second line of code that prints the contents of 'parameterVariable' on a new line.
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*
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* Parameter:
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* parameterVariable - A string of text.
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**/
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function greeting(parameterVariable) {
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// This line prints 'Hello, World!' to the console:
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console.log('Hello, World!');
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console.log(parameterVariable)
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}
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function main() {
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const parameterVariable = readLine();
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greeting(parameterVariable);
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 0. B. Data-Types.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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/**
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* The variables 'firstInteger', 'firstDecimal', and 'firstString' are declared for you -- do not modify them.
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* Print three lines:
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* 1. The sum of 'firstInteger' and the Number representation of 'secondInteger'.
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* 2. The sum of 'firstDecimal' and the Number representation of 'secondDecimal'.
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* 3. The concatenation of 'firstString' and 'secondString' ('firstString' must be first).
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*
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* Parameter(s):
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* secondInteger - The string representation of an integer.
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* secondDecimal - The string representation of a floating-point number.
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* secondString - A string consisting of one or more space-separated words.
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**/
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function performOperation(secondInteger, secondDecimal, secondString) {
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// Declare a variable named 'firstInteger' and initialize with integer value 4.
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const firstInteger = 4;
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// Declare a variable named 'firstDecimal' and initialize with floating-point value 4.0.
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const firstDecimal = 4.0;
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const firstString = 'HackerRank ';
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console.log(firstInteger + parseInt(secondInteger))
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console.log(firstDecimal + parseFloat(secondDecimal))
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console.log(firstString + secondString)
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}
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function main() {
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const secondInteger = readLine();
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const secondDecimal = readLine();
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const secondString = readLine();
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performOperation(secondInteger, secondDecimal, secondString);
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 1. A. Arithemetic Operators.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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/**
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* Calculate the area of a rectangle.
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*
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* length: The length of the rectangle.
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* width: The width of the rectangle.
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*
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* Return a number denoting the rectangle's area.
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**/
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function getArea(length, width) {
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let area;
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area = length * width
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return area;
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}
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function getPerimeter(length, width) {
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let perimeter;
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perimeter = (length + width) * 2
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return perimeter;
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}
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function main() {
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const length = +(readLine());
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const width = +(readLine());
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console.log(getArea(length, width));
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console.log(getPerimeter(length, width));
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 1. B. Functions.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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/*
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* Create the function factorial here
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*/
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function factorial(n) {
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if (n === 0) return 1;
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else return n * factorial(n - 1)
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}
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function main() {
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const n = +(readLine());
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console.log(factorial(n));
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 1. C. Let-And-Const.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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function main() {
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var a = readLine();
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console.log(Math.PI * a * a);
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console.log(2 * Math.PI * a);
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try {
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// Attempt to redefine the value of constant variable PI
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PI = 0;
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// Attempt to print the value of PI
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console.log(PI);
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} catch(error) {
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console.error("You correctly declared 'PI' as a constant.");
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}
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 2. A. If-Else.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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function getGrade(score) {
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let grade;
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if (score > 25 && score <= 30) grade = "A"
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else if (score > 20 && score <= 25) grade = "B"
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else if (score > 15 && score <= 20) grade = "C"
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else if (score > 10 && score <= 15) grade = "D"
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else if (score > 5 && score <= 10) grade = "E"
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else if (score >= 0 && score <= 5) grade = "F"
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return grade;
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}
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function main() {
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const score = +(readLine());
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console.log(getGrade(score));
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}

‎HackerRank-10-Days-Of-JavaScript-Solutions/Day 2. B. Conditional Statements.js

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/**
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*
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* By Aman Shekhar
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*
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**/
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'use strict';
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process.stdin.resume();
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process.stdin.setEncoding('utf-8');
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let inputString = '';
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let currentLine = 0;
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process.stdin.on('data', inputStdin => {
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inputString += inputStdin;
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});
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process.stdin.on('end', _ => {
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inputString = inputString.trim().split('\n').map(string => {
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return string.trim();
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});
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main();
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});
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function readLine() {
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return inputString[currentLine++];
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}
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function getLetter(s) {
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let letter;
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switch (true) {
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case "aeiou".includes(s[0]):
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letter = "A"
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break;
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case "bcdfg".includes(s[0]):
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letter = "B"
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break;
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case "hjklm".includes(s[0]):
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letter = "C"
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break;
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default:
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letter = "D"
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break;
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}
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return letter;
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}
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function main() {
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const s = readLine();
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console.log(getLetter(s));
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}

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