HackerRank 10 Days of Javascript Problem solution

10 Days of Javascript problem solving

#01: Day 0: Hello, World!

In this problem simple just add one variable. Example below: →

function greeting(parameterVariable) {
// This line prints 'Hello, World!' to the console:
console.log('Hello, World!\n'+parameterVariable);
}

#02: Day 0: Data Types

Sample Input 0

12
4.32
is the best place to learn and practice coding!

Sample Output 0

16
8.32
HackerRank is the best place to learn and practice coding!

Explanation 0

When we sum the integers and, we get the integer.
When we sum the floating-point numbers and, we get. When we concatenate HackerRank with is the best place to learn and practice coding!, we get HackerRank is the best place to learn and practice coding!.

You will not pass this challenge if you attempt to assign the Sample Case values to your variables instead of following the instructions above.

The solution is: →

function performOperation(secondInteger, secondDecimal, secondString) {
// Declare a variable named 'firstInteger' and initialize with integer value 4.
const firstInteger = 4;
// Declare a variable named 'firstDecimal' and initialize with floating-point value 4.0.
const firstDecimal = 4.0;
// Declare a variable named 'firstString' and initialize with the string "HackerRank".
const firstString = 'HackerRank ';
// Write code that uses console.log to print the sum of the 'firstInteger' and 'secondInteger' (converted to a Number        type) on a new line.
console.log(firstInteger+parseInt(secondInteger));
// Write code that uses console.log to print the sum of 'firstDecimal' and 'secondDecimal' (converted to a Number            type) on a new line.
console.log(firstDecimal+parseFloat(secondDecimal));
// Write code that uses console.log to print the concatenation of 'firstString' and 'secondString' on a new line. The        variable 'firstString' must be printed first.
console.log(firstString+secondString);
}

#03: Day 1: Arithmetic Operators

Sample Input 0

3
4.5

Sample Output 0

13.5
15

Explanation 0

The area of the rectangle is length*width = 3*4.5 =13.5
The perimeter of the rectangle is. 2*(length+width)=2*(3+4.5)

The solution is:

function getArea(length, width) {
let area;
// Write your code here
area = length*width;
return area;
}
function getPerimeter(length, width) {
let perimeter;
// Write your code here
perimeter = 2*(length+width);
return perimeter;
}

#04: Day 1: Functions

Sample Input 0

4

Sample Output 0

24

Explanation 0

We return the value of. 4! =4*3*2*1 = 24

The solution is:

/*
* Create the function factorial here
*/
function factorial(n){
if(n>0 && n<=1){
return n;
}else{
return n * factorial(n-1);
}}

#05: Day 1: Let and Const

Sample Input 0

2.6

Sample Output 0

21.237166338267002
16.336281798666924

Explanation 0

Given the radius,r=2.5 we calculate the following:

area = pi*r² =21.2371

perimeter = 2*pi*r=16.3362

We then print area as our first line of output and perimeter as our second line of output.

The solution is:

// Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
const PI = Math.PI;
const number = readLine();
// Print the area of the circle:
console.log(PI*(number*number));
// Print the perimeter of the circle:
console.log(2*PI*number);

#06: Day 2: Conditional Statements: If-Else

Sample Input 0

11

Sample Output 0

D

Explanation 0

Because score = 11 it satisfies the condition 10< score≤15 (which corresponds to D). Thus, we return D as our answer.

The solution is:

function getGrade(score) {
let grade;
// Write your code here
if(score>25 && score<=30){
grade = 'A';
}else if(score>20 && score<=25){
grade ='B';
}else if(score>15 && score<=20){
grade ='C';
}else if(score>10 && score<=15){
grade ='D';
}else if(score>5 && score<=10){
grade ='E';
}else if(score>0 && score<=5){
grade ='F';
}
return grade;
}

#07: Day 2: Conditional Statements: Switch

Sample Input 0

adfgt

Sample Output 0

A

Explanation 0

The first character of string s =adfgt is a. Because the given criteria stipulate that we print A any time the first character is in {a,e,i,o,u}, we return A as our answer.

The solution is:

function getLetter(s) {
let letter;
// Write your code here
const string = [...s];
const firstChar = string[0];
switch(firstChar){
case 'a'||'e'||'i'||'o'||'u':
letter='A';
break;
case 'b'||'c'||'d'||'f'||'g':
letter='B';
break;
case 'h'||'j'||'k'||'l'||'m':
letter='C';
break;
default:
letter='D';
}
return letter;
}

#08: Day 2: Loops

Sample Input 0

javascriptloops

Sample Output 0

a
a
i
o
o
j
v
s
c
r
p
t
l
p
s

Explanation 0

Observe the following:

• Each letter is printed on a new line.
• Then the vowels are printed in the same order as they appeared in s.
• Then the consonants are printed in the same order as they appeared in s.

The solution is:

function vowelsAndConsonants(s) {
const array = [...s];
const vowel = [];
const consonant = [];
array.forEach(word=>{
if(word==='a' || word==='e' || word==='i' || word==='o' || word==='u'){
vowel.push(word);
}else{
consonant.push(word);
}
})
const finalWords  =[...vowel,...consonant];
finalWords.map(alphabate=>{
console.log(alphabate);
})
}

#09: Day 3: Arrays

Sample Input 0

5
2 3 6 6 5

Sample Output 0

5

Explanation 0

Given the array, nums=[2,3,6,6,5] we see that the largest value in the array is 6 and the second largest value is 5. Thus, we return 5 as our answer.

function getSecondLargest(nums) {
// Complete the function
let largest = nums[0];
let secondLargest = nums[0];
for (let i = 1; i < nums.length; i++) {
if (nums[i] > largest) {
secondLargest = largest;
largest = nums[i];
continue;
}
if ((nums[i] > secondLargest) && (nums[i] < largest)) {
secondLargest = nums[i];
}
}
return secondLargest;
}

#10: Day 3: Try, Catch, and Finally

The solution is:

function reverseString(s) {
try{
console.log(s.split("").reverse().join(""));
}catch(err){
console.log(err.message)
console.log(s);
}
}

No more today. If you want to know more please search google and keep learning. If I make any mistakes please inform me. I will try my best to solve it. Thank you all.