Mastering these coding challenges may not get you a job at google... but you'll be one step closer to building your own JavaScript game at codeguppy.com.
These coding challenges are intended for beginners, therefore the solutions are implemented using only simple / classical programming elements. Each solution is acompanied by an online link that helps you quickly run it in a code playground at codeguppy.com
Note: The code is making use of the codeguppy specific function
println()to print the results. If you want to run these solutions outside codeguppy.com, just replaceprintln()withconsole.log()then run them using your browser console tool or node.js.
for(var i = 1; i <= 10; i++)
{
println(i);
}
for(var i = 1; i <= 100; i += 2)
{
println(i);
}
for(var i = 1; i <= 10; i++)
{
var row = "7 * " + i + " = " + 7 * i;
println(row);
}
for(var i = 1; i <= 10; i++)
{
printTable(i);
println("");
}
function printTable(n)
{
for(var i = 1; i <= 10; i++)
{
var row = n + " * " + i + " = " + n * i;
println(row);
}
}
var sum = 0;
for(var i = 1; i <= 10; i++)
{
sum += i;
}
println(sum);
var prod = 1;
for(var i = 1; i <= 10; i++)
{
prod *= i;
}
println(prod);
var sum = 0;
for(var i = 11; i <= 30; i += 2)
{
sum += i;
}
println(sum);
function celsiusToFahrenheit(n)
{
return n * 1.8 + 32;
}
var r = celsiusToFahrenheit(20);
println(r);
function fahrenheitToCelsius(n)
{
return (n - 32) / 1.8;
}
var r = fahrenheitToCelsius(68);
println(r);
function sumArray(ar)
{
var sum = 0;
for(var i = 0; i < ar.length; i++)
{
sum += ar[i];
}
return sum;
}
var ar = [2, 3, -1, 5, 7, 9, 10, 15, 95];
var sum = sumArray(ar);
println(sum);
function averageArray(ar)
{
var n = ar.length;
var sum = 0;
for(var i = 0; i < n; i++)
{
sum += ar[i];
}
return sum / n;
}
var ar = [1, 3, 9, 15, 90];
var avg = averageArray(ar);
println("Average: ", avg);
Coding challenge #12: Create a function that receives an array of numbers and returns an array containing only the positive numbers
Solution 1:
function getPositives(ar)
{
var ar2 = [];
for(var i = 0; i < ar.length; i++)
{
var el = ar[i];
if (el >= 0)
{
ar2.push(el);
}
}
return ar2;
}
var ar = [-5, 10, -3, 12, -9, 5, 90, 0, 1];
var ar2 = getPositives(ar);
println(ar2);
Coding challenge #12: Create a function that receives an array of numbers and returns an array containing only the positive numbers
Solution 2
function getPositives(ar)
{
var ar2 = [];
for(var el of ar)
{
if (el >= 0)
{
ar2.push(el);
}
}
return ar2;
}
var ar = [-5, 10, -3, 12, -9, 5, 90, 0, 1];
var ar2 = getPositives(ar);
println(ar2);
Coding challenge #12: Create a function that receives an array of numbers and returns an array containing only the positive numbers
Solution 3
function getPositives(ar)
{
return ar.filter(el => el >= 0);
}
var ar = [-5, 10, -3, 12, -9, 5, 90, 0, 1];
var ar2 = getPositives(ar);
println(ar2);
function findMax(ar)
{
var max = ar[0];
for(var i = 0; i < ar.length; i++)
{
if (ar[i] > max)
{
max = ar[i];
}
}
return max;
}
var ar = [-5, 10, -3, 12, -9, 5, 90, 0, 1];
var max = findMax(ar);
println("Max: ", max);
var f0 = 0;
println(f0);
var f1 = 1;
println(f1);
for(var i = 2; i < 10; i++)
{
var fi = f1 + f0;
println(fi);
f0 = f1;
f1 = fi;
}
function findFibonacci(n)
{
if (n == 0)
return 0;
if (n == 1)
return 1;
return findFibonacci(n - 1) + findFibonacci(n - 2);
}
var n = findFibonacci(10);
println(n);
function isPrime(n)
{
if (n < 2)
return false;
if (n == 2)
return true;
var maxDiv = Math.sqrt(n);
for(var i = 2; i <= maxDiv; i++)
{
if (n % i == 0)
{
return false;
}
}
return true;
}
println(2, " is prime? ", isPrime(2));
println(3, " is prime? ", isPrime(3));
println(4, " is prime? ", isPrime(4));
println(5, " is prime? ", isPrime(5));
println(9, " is prime? ", isPrime(9));
function sumDigits(n)
{
var s = n.toString();
var sum = 0;
for(var char of s)
{
var digit = parseInt(char);
sum += digit;
}
return sum;
}
var sum = sumDigits(1235231);
println("Sum: ", sum);
printPrimes(100);
// Function prints the first nPrimes numbers
function printPrimes(nPrimes)
{
var n = 0;
var i = 2;
while(n < nPrimes)
{
if (isPrime(i))
{
println(n, " --> ", i);
n++;
}
i++;
}
}
// Returns true if a number is prime
function isPrime(n)
{
if (n < 2)
return false;
if (n == 2)
return true;
var maxDiv = Math.sqrt(n);
for(var i = 2; i <= maxDiv; i++)
{
if (n % i == 0)
{
return false;
}
}
return true;
}
Coding challenge #19: Create a function that will return in an array the first "nPrimes" prime numbers greater than a particular number "startAt"
println(getPrimes(10, 100));
function getPrimes(nPrimes, startAt)
{
var ar = [];
var i = startAt;
while(ar.length < nPrimes)
{
if (isPrime(i))
{
ar.push(i);
}
i++;
}
return ar;
}
// Returns true if a number is prime
function isPrime(n)
{
if (n < 2)
return false;
if (n == 2)
return true;
var maxDiv = Math.sqrt(n);
for(var i = 2; i <= maxDiv; i++)
{
if (n % i == 0)
{
return false;
}
}
return true;
}
var ar = [1, 2, 3];
rotateLeft(ar);
println(ar);
function rotateLeft(ar)
{
var first = ar.shift();
ar.push(first);
}
var ar = [1, 2, 3];
rotateRight(ar);
println(ar);
function rotateRight(ar)
{
var last = ar.pop();
ar.unshift(last);
}
var ar = [1, 2, 3];
var ar2 = reverseArray(ar);
println(ar2);
function reverseArray(ar)
{
var ar2 = [];
for(var i = ar.length - 1; i >= 0; i--)
{
ar2.push(ar[i]);
}
return ar2;
}
var s = reverseString("JavaScript");
println(s);
function reverseString(s)
{
var s2 = "";
for(var i = s.length - 1; i >= 0; i--)
{
var char = s[i];
s2 += char;
}
return s2;
}
Coding challenge #24: Create a function that will merge two arrays and return the result as a new array
var ar1 = [1, 2, 3];
var ar2 = [4, 5, 6];
var ar = mergeArrays(ar1, ar2);
println(ar);
function mergeArrays(ar1, ar2)
{
var ar = [];
for(let el of ar1)
{
ar.push(el);
}
for(let el of ar2)
{
ar.push(el);
}
return ar;
}
Coding challenge #25: Create a function that will receive two arrays of numbers as arguments and return an array composed of all the numbers that are either in the first array or second array but not in both
var ar1 = [1, 2, 3, 10, 5, 3, 14];
var ar2 = [1, 4, 5, 6, 14];
var ar = mergeExclusive(ar1, ar2);
println(ar);
function mergeExclusive(ar1, ar2)
{
var ar = [];
for(let el of ar1)
{
if (!ar2.includes(el))
{
ar.push(el);
}
}
for(let el of ar2)
{
if (!ar1.includes(el))
{
ar.push(el);
}
}
return ar;
}
Coding challenge #26: Create a function that will receive two arrays and will return an array with elements that are in the first array but not in the second
var ar1 = [1, 2, 3, 10, 5, 3, 14];
var ar2 = [-1, 4, 5, 6, 14];
var ar = mergeLeft(ar1, ar2);
println(ar);
function mergeLeft(ar1, ar2)
{
var ar = [];
for(let el of ar1)
{
if (!ar2.includes(el))
{
ar.push(el);
}
}
return ar;
}
Coding challenge #27: Create a function that will receive an array of numbers as argument and will return a new array with distinct elements
Solution 1
var ar = getDistinctElements([1, 2, 3, 6, -1, 2, 9, 7, 10, -1, 100]);
println(ar);
function getDistinctElements(ar)
{
var ar2 = [];
for(let i = 0; i < ar.length; i++)
{
if (!isInArray(ar[i], ar2))
{
ar2.push(ar[i]);
}
}
return ar2;
}
function isInArray(n, ar)
{
for(let i = 0; i < ar.length; i++)
{
if (ar[i] === n)
return true;
}
return false;
}
Coding challenge #27: Create a function that will receive an array of numbers as argument and will return a new array with distinct elements
Solution 2
var ar = getDistinctElements([1, 2, 3, 6, -1, 2, 9, 7, 10, -1, 100]);
println(ar);
function getDistinctElements(ar)
{
var ar2 = [];
var lastIndex = ar.length - 1;
for(let i = 0; i <= lastIndex; i++)
{
if (!isInArray(ar[i], ar, i + 1, lastIndex))
{
ar2.push(ar[i]);
}
}
return ar2;
}
function isInArray(n, ar, fromIndex, toIndex)
{
for(var i = fromIndex; i <= toIndex; i++)
{
if (ar[i] === n)
return true;
}
return false;
}
var n = 10;
println("Sum of first ", n, " primes is ", sumPrimes(10));
function sumPrimes(n)
{
var foundPrimes = 0;
var i = 2;
var sum = 0;
while(foundPrimes < n)
{
if (isPrime(i))
{
foundPrimes++;
sum += i;
}
i++;
}
return sum;
}
// Returns true if number n is prime
function isPrime(n)
{
if (n < 2)
return false;
if (n == 2)
return true;
var maxDiv = Math.sqrt(n);
for(var i = 2; i <= maxDiv; i++)
{
if (n % i === 0)
{
return false;
}
}
return true;
}
printDistances(100);
// Print distances between the first n prime numbers
function printDistances(n)
{
var lastPrime = 2;
var i = lastPrime + 1;
var foundPrimes = 1;
while(foundPrimes < n)
{
if (isPrime(i))
{
println(i - lastPrime, "\t", i, " - ", lastPrime);
foundPrimes++;
lastPrime = i;
}
i++;
}
}
// Returns true if number n is prime
function isPrime(n)
{
if (n < 2)
return false;
if (n == 2)
return true;
var maxDiv = Math.sqrt(n);
for(var i = 2; i <= maxDiv; i++)
{
if (n % i === 0)
{
return false;
}
}
return true;
}
Coding challenge #30-a: Create a function that will add two positive numbers of indefinite size. The numbers are received as strings and the result should be also provided as string.
Solution 1
var n1 = "2909034221912398942349";
var n2 = "1290923909029309499";
var sum = add(n1, n2);
println(n1, "\n", n2, "\n", sum);
function add(sNumber1, sNumber2)
{
var s = "";
var carry = 0;
var maxSize = Math.max(sNumber1.length, sNumber2.length);
for(var i = 0; i < maxSize; i++)
{
var digit1 = digitFromRight(sNumber1, i);
var digit2 = digitFromRight(sNumber2, i);
var sum = digit1 + digit2 + carry;
var digitSum = sum % 10;
carry = sum >= 10 ? 1 : 0;
s = digitSum.toString() + s;
}
if (carry > 0)
s = carry + s;
return s;
}
function digitFromRight(s, digitNo)
{
if (digitNo >= s.length)
return 0;
var char = s[ s.length - 1 - digitNo ];
return parseInt(char);
}
Coding challenge #30-b: Create a function that will add two positive numbers of indefinite size. The numbers are received as strings and the result should be also provided as string.
Solution 2
var n1 = "2909034221912398942349";
var n2 = "1290923909029309499";
var sum = add(n1, n2);
println(n1);
println(n2);
println(sum);
function add(sNumber1, sNumber2)
{
var maxSize = Math.max(sNumber1.length, sNumber2.length);
var s1 = sNumber1.padStart(maxSize, "0");
var s2 = sNumber2.padStart(maxSize, "0");
var s = "";
var carry = 0;
for(var i = maxSize - 1; i >= 0; i--)
{
var digit1 = parseInt(s1[i]);
var digit2 = parseInt(s2[i]);
var sum = digit1 + digit2 + carry;
var digitSum = sum % 10;
carry = sum >= 10 ? 1 : 0;
s = digitSum.toString() + s;
}
if (carry > 0)
s = carry + s;
return s;
}
// Solution 1
function countWords(text)
{
var wasSeparator = true;
var words = 0;
for(var c of text)
{
// if current character is separator then advance and
// set that the previous character was separator
if (isSeparator(c))
{
wasSeparator = true;
continue;
}
// if current character is not separator
// ... but if previous was separator...
if (wasSeparator)
{
words++;
wasSeparator = false;
}
}
return words;
}
function isSeparator(c)
{
var separators = [" ", "\t", "\n", "\r", ",", ";", ".", "!", "?"];
return separators.includes(c);
}
println(countWords(""));
println(countWords(" "));
println(countWords("JavaScript!!! "));
println(countWords(" JavaScript"));
println(countWords(" JavaScript is cool "));
println(countWords("I like to learn JavaScript with codeguppy"));
// Solution 2
function countWords(text)
{
var words = 0;
if (text.length > 0 && !isSeparator(text[0]))
words++;
for(var i = 1; i < text.length; i++)
{
var currChr = text[i];
var prevChr = text[i - 1];
if (!isSeparator(currChr) && isSeparator(prevChr))
{
words++;
}
}
return words;
}
function isSeparator(c)
{
var separators = [" ", "\t", "\n", "\r", ",", ";", ".", "!", "?"];
return separators.includes(c);
}
println(countWords(""));
println(countWords(" "));
println(countWords("JavaScript!!! "));
println(countWords(" JavaScript"));
println(countWords(" JavaScript is cool "));
println(countWords("I like to learn JavaScript with codeguppy"));
Coding challenge #32. Create a function that will capitalize the first letter of each word in a text
println(captializeWords("Create a function that will capitalize the first letter of each word in a text"));
function captializeWords(text)
{
var text2 = "";
for(var i = 0; i < text.length; i++)
{
var currChr = text[i];
var prevChr = i > 0 ? text[i - 1] : " ";
if (!isSeparator(currChr) && isSeparator(prevChr))
{
currChr = currChr.toUpperCase();
}
text2 += currChr;
}
return text2;
}
function isSeparator(c)
{
var separators = [" ", "\t", "\n", "\r", ",", ";", ".", "!", "?"];
return separators.includes(c);
}
println(sumCSV("1.5, 2.3, 3.1, 4, 5.5, 6, 7, 8, 9, 10.9"));
function sumCSV(s)
{
var ar = s.split(",");
var sum = 0;
for(var n of ar)
{
sum += parseFloat(n);
}
return sum;
}
var text = "Create a function, that will return an array (of string), with the words inside the text";
println(getWords(text));
function getWords(text)
{
let startWord = -1;
let ar = [];
for(let i = 0; i <= text.length; i++)
{
let c = i < text.length ? text[i] : " ";
if (!isSeparator(c) && startWord < 0)
{
startWord = i;
}
if (isSeparator(c) && startWord >= 0)
{
let word = text.substring(startWord, i);
ar.push(word);
startWord = -1;
}
}
return ar;
}
function isSeparator(c)
{
var separators = [" ", "\t", "\n", "\r", ",", ";", ".", "!", "?", "(", ")"];
return separators.includes(c);
}
var data = "John;Smith;954-000-0000\nMich;Tiger;305-000-0000\nMonique;Vasquez;103-000-0000";
var ar = csvToArray(data);
println(JSON.stringify(ar));
function csvToArray(data)
{
var arLines = data.split("\n");
for(var i = 0; i < arLines.length; i++)
{
var arLine = arLines[i].split(";");
arLines[i] = arLine;
}
return arLines;
}
println(getChars("I like JavaScript"));
function getChars(s)
{
return Array.from(s);
}
Coding challenge #37. Create a function that will convert a string in an array containing the ASCII codes of each character
println(getCharCodes("I like JavaScript"));
function getCharCodes(s)
{
var ar = [];
for(var i = 0; i < s.length; i++)
{
var code = s.charCodeAt(i);
ar.push(code);
}
return ar;
}
Coding challenge #38. Create a function that will convert an array containing ASCII codes in a string
println(codesToString([73,32,108,105,107,101,32,74,97,118,97,83,99,114,105,112,116]));
function codesToString(ar)
{
return String.fromCharCode(...ar);
}
var text = "I LOVE JAVASCRIPT";
var textEnc = encrypt(text, 13);
var textDec = decrypt(textEnc, 13);
println(text);
println(textEnc);
println(textDec);
// Decrypt a message by using the same encrypt function
// ... but using the inverse of the key (e.g. rotate in the other direction)
function decrypt(msg, key)
{
return encrypt(msg, key * -1);
}
// Function will implement Caesar Cipher to
// encrypt / decrypt the msg by shifting the letters
// of the message acording to the key
function encrypt(msg, key)
{
var encMsg = "";
for(var i = 0; i < msg.length; i++)
{
var code = msg.charCodeAt(i);
// Encrypt only letters in 'A' ... 'Z' interval
if (code >= 65 && code <= 65 + 26 - 1)
{
code -= 65;
code = mod(code + key, 26);
code += 65;
}
encMsg += String.fromCharCode(code);
}
return encMsg;
}
// Modulo function: n mod p
function mod(n, p)
{
if ( n < 0 )
n = p - Math.abs(n) % p;
return n % p;
}
var ar = [23, 1000, 1, -1, 8, 3];
println(ar);
bubbleSort(ar);
println(ar);
function bubbleSort(ar)
{
var shouldSort = true;
var length = ar.length;
while(shouldSort)
{
shouldSort = false;
length--;
for(var i = 0; i < length; i++)
{
var a = ar[i];
if ( a > ar[i+1] )
{
ar[i] = ar[i+1];
ar[i+1] = a;
shouldSort = true;
}
}
}
}
Coding challenge #41. Create a function to calculate the distance between two points defined by their x, y coordinates
println(getDistance(100, 100, 400, 300));
function getDistance(x1, y1, x2, y2)
{
var l1 = x2 - x1;
var l2 = y2 - y1;
return Math.sqrt(l1 * l1 + l2 * l2);
}
Coding challenge #42. Create a function that will return a Boolean value indicating if two circles defined by center coordinates and radius are intersecting
println(collisionCircleCircle(200, 200, 100, 300, 300, 50));
function collisionCircleCircle(circle1X, circle1Y, circle1R, circle2X, circle2Y, circle2R)
{
return getDistance(circle1X, circle1Y, circle2X, circle2Y) <= circle1R + circle2R;
}
// Calculate the distance between the two specified points
function getDistance(x1, y1, x2, y2)
{
var l1 = x2 - x1;
var l2 = y2 - y1;
return Math.sqrt(l1 * l1 + l2 * l2);
}
Coding challenge 43. Create a function that will receive a bi-dimensional array as argument and a number and will extract as a unidimensional array the column specified by the number
var ar = [ ["John", 120],
["Jane", 115],
["Thomas", 123],
["Mel", 112],
["Charley", 122]
];
var numbers = extractCol(ar, 1);
println(numbers);
function extractCol(ar, colNo)
{
var arCol = [];
for(var i = 0; i < ar.length; i++)
{
arCol.push(ar[i][colNo]);
}
return arCol;
}
Coding challenge #44. Create a function that will convert a string containing a binary number into a number
println(binaryToNumber("11111111"));
function binaryToNumber(sBinary)
{
return parseInt(sBinary, 2);
}
Coding challenge #45. Create a function to calculate the sum of all the numbers in a jagged array (array contains numbers or other arrays of numbers on an unlimited number of levels)
var ar = [1, 2, [15, [23], [5, 12]], [100]];
println(sumArray(ar));
function sumArray(ar)
{
var sum = 0;
for(var el of ar)
{
if (Array.isArray(el))
{
el = sumArray(el);
}
sum += el;
}
return sum;
}
// Solution 1
var ar = [2, 4, 10, [12, 4, [100, 99], 4], [3, 2, 99], 0];
var max = findMax(ar);
println("Max = ", max);
// Use recursion to find the maximum numeric value in an array of arrays
function findMax(ar)
{
var max = -Infinity;
// Cycle through all the elements of the array
for(var i = 0; i < ar.length; i++)
{
var el = ar[i];
// If an element is of type array then invoke the same function
// to find out the maximum element of that subarray
if ( Array.isArray(el) )
{
el = findMax( el );
}
if ( el > max )
{
max = el;
}
}
return max;
}
// Solution 2
var ar = [2, 4, 10, [12, 4, [100, 99], 4], [3, 2, 99], 0];
var max = findMax(ar);
println("Max = ", max);
// Use a stack to find the maximum numeric value in an array of arrays
function findMax(arElements)
{
var max = -Infinity;
// This is the stack on which will put the first array and then
// all the other sub-arrays that we find as we traverse an array
var arrays = [];
arrays.push(arElements);
// Loop as long as are arrays added to the stack for processing
while(arrays.length > 0)
{
// Extract an array from the stack
ar = arrays.pop();
// ... and loop through its elements
for(var i = 0; i < ar.length; i++)
{
var el = ar[i];
// If an element is of type array, we'll add it to stack
// to be processed later
if ( Array.isArray(el) )
{
arrays.push(el);
continue;
}
if ( el > max )
{
max = el;
}
}
}
return max;
}
var ar1 = [2, 4, 10, [12, 4, [100, 99], 4], [3, 2, 99], 0];
var ar2 = copyArray(ar1);
println(ar2);
function copyArray(ar)
{
var ar2 = [];
for(var el of ar)
{
if (Array.isArray(el))
{
el = copyArray(el);
}
ar2.push(el);
}
return ar2;
}
var text = "Create a function to return the longest word(s) in a sentance.";
println(getLongestWords(text));
function getLongestWords(text)
{
var words = getWords(text);
var maxSize = 0;
var maxPositions = [];
for(var i = 0; i < words.length; i++)
{
var currWordSize = words[i].length;
if (currWordSize > maxSize)
{
maxSize = currWordSize;
maxPositions = [ i ];
}
else if (currWordSize === maxSize)
{
maxPositions.push(i);
}
}
return getElements(words, maxPositions);
}
// Get only the elements from specified positions from the array
function getElements(ar, arPositions)
{
var arNew = [];
for(var pos of arPositions)
{
arNew.push(ar[pos]);
}
return arNew;
}
// Returns an array with the words from specified text
function getWords(text)
{
let startWord = -1;
let ar = [];
for(let i = 0; i <= text.length; i++)
{
let c = i < text.length ? text[i] : " ";
if (!isSeparator(c) && startWord < 0)
{
startWord = i;
}
if (isSeparator(c) && startWord >= 0)
{
let word = text.substring(startWord, i);
ar.push(word);
startWord = -1;
}
}
return ar;
}
function isSeparator(c)
{
var separators = [" ", "\t", "\n", "\r", ",", ";", ".", "!", "?", "(", ")"];
return separators.includes(c);
}
var ar = ["Shuffle", "an", "array", "of", "strings"];
println(shuffleArray(ar));
// Shuffle array implemented using Fisher–Yates shuffle algorithm
function shuffleArray(ar)
{
for(var i = ar.length - 1; i > 0; i--)
{
var j = randomInt(0, i - 1);
var t = ar[i];
ar[i] = ar[j];
ar[j] = t;
}
return ar;
}
// Get a random int between min and max (both included)
function randomInt(min, max)
{
return Math.floor(Math.random() * (max - min + 1) ) + min;
}
Coding challenge #50. Create a function that will receive n as argument and return an array of n unique random numbers from 1 to n.
println(getRandomNumbers(10));
function getRandomNumbers(n)
{
var ar = [];
for(var i = 1; i <= n; i++)
{
ar.push(i);
}
shuffleArray(ar);
return ar;
}
// Shuffle array implemented using Fisher–Yates shuffle algorithm
function shuffleArray(ar)
{
for(var i = ar.length - 1; i > 0; i--)
{
var j = randomInt(0, i - 1);
var t = ar[i];
ar[i] = ar[j];
ar[j] = t;
}
return ar;
}
// Get a random int between min and max (both included)
function randomInt(min, max)
{
return Math.floor(Math.random() * (max - min + 1) ) + min;
}
Coding challenge #51. Find the frequency of characters inside a string. Return the result as an array of objects. Each object has 2 fields: character and number of occurrences.
var ar = getCharFrequency("Find the frequency of characters inside a string");
println(JSON.stringify(ar));
function getCharFrequency(text)
{
var ar = [];
for(var chr of text)
{
updateFrequency(ar, chr);
}
return ar;
}
function updateFrequency(ar, chr)
{
for(var el of ar)
{
if (el.chr === chr)
{
el.count++;
}
}
ar.push({ chr : chr, count : 1 });
}
println(fibonacci(500));
function fibonacci(n)
{
if (n === 0)
return "0";
if (n === 1)
return "1";
var n1 = "0";
var n2 = "1";
for(var i = 2; i <= n; i++)
{
var sum = add(n1, n2);
n1 = n2;
n2 = sum;
}
return n2;
}
function add(sNumber1, sNumber2)
{
var maxSize = Math.max(sNumber1.length, sNumber2.length);
var s1 = sNumber1.padStart(maxSize, "0");
var s2 = sNumber2.padStart(maxSize, "0");
var s = "";
var carry = 0;
for(var i = maxSize - 1; i >= 0; i--)
{
var digit1 = parseInt(s1[i]);
var digit2 = parseInt(s2[i]);
var sum = digit1 + digit2 + carry;
var digitSum = sum % 10;
carry = sum >= 10 ? 1 : 0;
s = digitSum.toString() + s;
}
if (carry > 0)
s = carry + s;
return s;
}
println(factorial(70));
// Calculate factorial(n) ... using big number calculations
function factorial(n)
{
var prod = "1";
for(var i = 2; i <= n; i++)
{
prod = mult(prod, i.toString());
}
return prod;
}
// Multiplies sNumber1 * sNumber2
// Each number is provided as string
function mult(sNumber1, sNumber2)
{
// Calculate partial results according to multiplication algorithm
var partialResults = [];
for(var i = sNumber2.length - 1; i >= 0; i--)
{
var digit = parseInt(sNumber2[i]);
var partialResult = multDigit(sNumber1, digit);
partialResult += "0".repeat(partialResults.length);
partialResults.push(partialResult);
}
// Sum partial results to obtain the product
var sum = "";
for(var r of partialResults)
{
sum = add(sum, r);
}
return sum;
}
// Multiplies number sNumber (as string) with a single digit number
function multDigit(sNumber, digit)
{
var p = "";
var carry = 0;
for(var i = sNumber.length - 1; i >= 0; i--)
{
var numberDigit = parseInt(sNumber[i]);
var prod = digit * numberDigit + carry;
var prodDigit = prod % 10;
carry = Math.floor(prod / 10);
p = prodDigit.toString() + p;
}
if (carry > 0)
p = carry + p;
return p;
}
function add(sNumber1, sNumber2)
{
var maxSize = Math.max(sNumber1.length, sNumber2.length);
var s1 = sNumber1.padStart(maxSize, "0");
var s2 = sNumber2.padStart(maxSize, "0");
var s = "";
var carry = 0;
for(var i = maxSize - 1; i >= 0; i--)
{
var digit1 = parseInt(s1[i]);
var digit2 = parseInt(s2[i]);
var sum = digit1 + digit2 + carry;
var digitSum = sum % 10;
carry = sum >= 10 ? 1 : 0;
s = digitSum.toString() + s;
}
if (carry > 0)
s = carry + s;
return s;
}
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