In this blog post, you will find the HackerRank JavaScript Basic certification Solutions. The answers to questions are:-
HackerRank JavaScript Basic Certifiation Solution :-
fizz-buzz.js
‘use strict’
function fizzBuzz(number) {
for (let i = 1 ; i <= number ; i++) {
if (i % 3 === 0 && i % 5 === 0) {
console.log(‘FizzBuzz’);
} else if (i % 3 === 0) {
console.log(‘Fizz’);
} else if (i % 5 === 0) {
console.log(‘Buzz’);
} else {
console.log(i);
}
}
}
fizzBuzz(10);
notes-store.js
‘use strict’;
const fs = require(‘fs’);
process.stdin.resume();
process.stdin.setEncoding(‘utf-8’);
let inputString = ”;
let currentLine = 0;
process.stdin.on(‘data’, function(inputStdin) {
inputString += inputStdin;
});
process.stdin.on(‘end’, function() {
inputString = inputString.split(‘\n’);
main();
});
function readLine() {
return inputString[currentLine++];
}
const completedNotes = [];
const activeNotes = [];
const otherNotes = [];
class NotesStore {
addNote(state, name) {
if (name === undefined || name === null || name === ”) {
throw new Error(‘Name cannot be empty’);
}
if (!this.isValid(state)) {
throw new Error(‘Invalid state ‘ + state);
}
this.getNotesList(state).push(name);
}
getNotes(state) {
if (!this.isValid(state)) {
throw new Error(‘Invalid state ‘ + state);
}
return this.getNotesList(state);
}
getNotesList(state) {
if (state === ‘completed’) {
return completedNotes;
} else if (state === ‘active’) {
return activeNotes;
}
return otherNotes;
}
isValid(state) {
return state === ‘completed’
|| state === ‘active’
|| state === ‘others’;
}
}
function main() {
const ws = fs.createWriteStream(process.env.OUTPUT_PATH);
const obj = new NotesStore();
const operationCount = parseInt(readLine().trim());
for(let i = 1; i <= operationCount; i++) {
const operationInfo = readLine().trim().split(‘ ‘);
try {
if (operationInfo[0] === ‘addNote’) {
obj.addNote(operationInfo[1], operationInfo[2] || ”);
} else if (operationInfo[0] === ‘getNotes’) {
const res = obj.getNotes(operationInfo[1]);
if (res.length === 0) {
ws.write(‘No Notes\n’);
} else {
ws.write(`${res.join(‘,’)}\n`);
}
}
} catch (e) {
ws.write(`${e}\n`);
}
}
ws.end();
}
order-list-processing.js
‘use strict’;
function processOrderList(orderList, orderId, state) {
return state === ‘Processing’ ?
orderList.map(item => ({
…item,
state: item.id === orderId ? ‘Processing’ : item.state
})) :
orderList.filter(item => item.id !== orderId);
}
user-warning-data
class User {
constructor(username) {
this.name = username;
}
getUsername () {
return this.name;
}
setUsername(username) {
this.name = username;
}
}
class ChatUser extends User {
constructor(userName) {
super(userName;
this.count = 0;
}
giveWarning() {
let count = this.count + 1;
this.count = count;
}
getWarningCount() {
return this.count;
}
}
step-counter.js
const counter = (
function counter() {
let value = 0;
return {
getValue: function() {
return value;
},
changeBy: function (k) {
value += k;
}
}
}
)();
function getFixedCounter(k) {
let myCounter = counter;
return {
increment: () => {
myCounter.changeBy(k);
},
decrement: () => {
myCounter.changeBy(-k);
},
getValue: () => {
return myCounter.getValue();
}
}
}
console.log(counter.getValue());
counter.changeBy(10);
counter.changeBy(20);
console.log(counter.getValue());
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