CHALLENGES.md

Challenges

Below all the available challenges and some relative examples.

• 1. ROUND NUMBER

  • NAME: round
  • DESCRIPTION: Write a function that round a number to given decimal places.

   	round(Math.PI, 2); // => 3.14 

• 2. MERGE MULTIPLE ARRAYS

  • NAME: arrayMerge
  • DESCRIPTION: Write a function that merges multiple given arrays.

   	arrayMerge([1, 2], [3, 4]); // => [1, 2, 3, 4]

• 3. SUM CONTENT OF AN ARRAY

  • NAME: arraySum
  • DESCRIPTION: Write a function to sum the content of an array.

   	arraySum([1, 2, 3]) // => 6

• 4. OBJECT FOREACH

  • NAME: objectForEach
  • DESCRIPTION: Write a forEach function that works with Objects.

   	var obj = {
   		first_name: 'Elon',
   		last_name: 'Musk'
   	}
  
   	objectForEach(obj, (key, value) => {
   		console.log(key, value) 
   	})
  
   	//=> 'first_name', 'Elon'
   	//=> 'last_name', 'Musk'

• 5. STRING REVERSE

  • NAME: reverseString
  • DESCRIPTION: Write a function that reverse a string.

   	reverseString('hello world!') //=> '!dlrow olleh'

• 6. CHECK PALINDROME

  • NAME: isPalindrome
  • DESCRIPTION: Write a function that checks if a word is a palindrome.

   	isPalindrome('level') //=> true
   	isPalindrome('racecar') //=> true

• 7. IS MULTIPLE

  • NAME: isMultipleOf
  • DESCRIPTION: Write a function that checks if a number is multiple of another number.

   	isMultipleOf(15, 3) //=> true
   	isMultipleOf(15, 5) //=> true

• 8. GET THE LONGEST WORD

  • NAME: longestWord
  • DESCRIPTION: Write a function that returns the longest word of a sentence.

   	longestWord('Hello beautiful people!') //=> 'beautiful'
   	longestWord('aaaa bbb cc d eeee') //=> 'aaaa'

• 9. CAPITALIZE

  • NAME: capitalize
  • DESCRIPTION: Write a function that capitalize each word in a sentence.

   	capitalize('hello world') //=> 'Hello World'

• 10. VOWEL COUNT

  • NAME: vowelCount
  • DESCRIPTION: Write a function that count vowel in a sentence.

   	vowelCount('hello') //=> 2

• 11. MAX CHAR

  • NAME: maxChar
  • DESCRIPTION: Get the most used char in a sentence.

   	maxChar('hello world') //=> {count: 3, char: 'l'}

• 12. FIZZ BUZZ

  • NAME: fizzBuzz
  • DESCRIPTION: Fizz Buzz game, generate number from 0 to 100 and if the number is multiple of 3 print "Fizz", if mutliple of 5 print "Buzz", if is multiple of both print "FizzBuzz" else print the number.

   	fizzBuzz();
  
   	//=> 1 
   	//=> 2
   	//=> fizz 
   	//=> 4 
   	//=> buzz
   	//=> fizz
   	//=> 7
   	//=> 8
   	//=> fizz
   	//=> buzz

• 13. SIMPLE ADDING

  • NAME: simpleAdding
  • DESCRIPTION: Write a function that sums all numbers from 0 to the given number.

   	simpleAdding(3) //=> 6

• 14. ARRAY TO TREE

  • NAME: arrayToTree
  • DESCRIPTION: Transform an array into a tree like object.

   	arrayToTree(['folder', 'subfolder', 'file.txt']) //=> [{name: 'folder', children: [ { name: 'subfolder', children: [ {name: 'file.txt'} ]} ]}]

• 15. ALPHABETICALLY SORT

  • NAME: alphabeticallySort
  • DESCRIPTION: Write a function that can be used into an Array.sort() for sorting items alphabetically.

   	var myArray = ['Italy', 'Canada', 'Germany'];
   	var mySortedArray = myArray.sort(alphabeticallySort) //=> ['Canada', 'Germany', 'Italy']

• 16. FIRST RECURRING CHARACTER

  • NAME: firstRecurringChar
  • DESCRIPTION: Write a function that returns the furst recurring character in a string.

   	firstRecurringChar('abacyb') //=> 'a'

• 17. OBJECT MERGE

  • NAME: objectMerge
  • DESCRIPTION: Write a function that returns an object that includes all given objects.

   	/* Example usage */
   	const user = [
   		{ first: 'john' },
   		{ last:  'doe' }
   	];
  
   	objectMerge({ first: 'john' }, { last: 'doe' });
   	/* OR */
   	objectMerge(user);