added all questions solution

Author: arifuddincoder

problem10-pingpong.js

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+// Problem 10: PingPong Challenge
+// Write a function that prints numbers from 1 to 20.
+
+// Example:
+
+// For multiples of 3, print "Ping"
+// For multiples of 5, print "Pong"
+// For multiples of both 3 and 5, print "PingPong"
+// If the number is not a multiple of 3 or 5, print the number itself
+// Example Output:
+
+// 1, 2, Ping, 4, Pong, Ping, 7, 8, Ping, Pong, 11, Ping, 13, 14, PingPong, 16 …..
+
+const pingPong = (input) => {
+	let result = [];
+
+	for (i = 1; i <= input; i++) {
+		if (i % 3 === 0 && i % 5 === 0) {
+			result.push("PingPong");
+		} else if (i % 5 === 0) {
+			result.push("Pong");
+		} else if (i % 3 === 0) {
+			result.push("Ping");
+		} else {
+			result.push(i);
+		}
+	}
+
+	return result.join(", ");
+};
+
+console.log(pingPong(20));

problem2-count-vowels.js

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+// Write a function that counts how many vowels (a, e, i, o, u) are in a given string.
+
+// Example:
+
+// Input: "programming"
+// Output: 3
+
+const vowelCounting = (inputStr) => {
+	const vowels = "aeiou";
+	let vowelsCount = 0;
+
+	for (const char of inputStr) {
+		if (vowels.includes(char)) {
+			vowelsCount++;
+		}
+	}
+
+	return vowelsCount;
+};
+
+console.log(vowelCounting("programming"));

problem3-palindrome.js

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+// Problem 3: Check for Palindrome
+// Write a function that checks if a string is a palindrome (reads the same forward and backward).
+
+// Example:
+
+// Input: "madam"
+// Output: true
+// Input: "hello"
+// Output: false
+
+const checkPalindrome = (input) => {
+	return input === input.split("").reverse().join("");
+};
+
+console.log(checkPalindrome("madam"));
+console.log(checkPalindrome("hello"));

problem4-max-number.js

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+// Problem 4: Find the Maximum Number
+// Write a function that takes an array of numbers and returns the largest number.
+
+// Example:
+
+// Input: [5, 1, 9, 3]
+// Output: 9
+
+const maximumNumber = (input) => {
+	return Math.max(...input);
+};
+
+console.log(maximumNumber([5, 1, 9, 3]));

problem5-remove-duplicates.js

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+// Problem 5: Remove Duplicates from an Array
+// Write a function that removes all duplicate numbers from an array.
+
+// Example:
+
+// Input: [1, 2, 2, 3, 4, 4]
+// Output: [1, 2, 3, 4]
+
+const removeDuplicates = (input) => {
+	return input.filter((item, index, array) => array.indexOf(item) === index);
+};
+
+console.log(removeDuplicates([1, 2, 2, 3, 4, 4]));

problem6-sum-array.js

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+// Problem 6: Sum of All Numbers in an Array
+// Write a function that returns the sum of all numbers in an array.
+
+// Example:
+
+// Input: [1, 2, 3, 4]
+// Output: 10
+
+const sumOfAllNumbers = (input) => {
+	let total = 0;
+	for (const i of input) {
+		total = total + i;
+	}
+	return total;
+};
+
+console.log(sumOfAllNumbers([1, 2, 3, 4]));

problem7-even-numbers.js

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+// Problem 7: Find Even Numbers in an Array
+// Write a function that returns all even numbers from a given array.
+
+// Example:
+
+// Input: [1, 2, 3, 4, 5, 6]
+// Output: [2, 4, 6]
+
+const evenNumbers = (input) => {
+	return input.filter((item) => item % 2 === 0);
+};
+
+console.log(evenNumbers([1, 2, 3, 4, 5, 6]));

problem8-capitalize-words.js

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+// Problem 8: Capitalize First Letter of Each Word
+// Write a function that capitalizes the first letter of each word in a string.
+
+// Example:
+
+// Input: "hello world"
+// Output: "Hello World"
+
+const capitalizesFirstLetter = (input) => {
+	const inputArray = input.split(" ");
+	const capitalizeArray = inputArray.map((item) => item.charAt(0).toUpperCase() + item.slice(1));
+	return capitalizeArray.join(" ");
+};
+
+console.log(capitalizesFirstLetter("hello world"));

problem9-factorial.js

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+// Problem 9: Find the Factorial of a Number
+// Write a function that calculates the factorial of a number using a loop.
+
+// Example:
+
+// Input: 5
+// Output: 120
+
+const factorialNumber = (input) => {
+	let output = 1;
+	for (let i = 2; i <= input; i++) {
+		output *= i;
+	}
+
+	return output;
+};
+
+console.log(factorialNumber(5));