# JSFiddle

### Check for Palindromes

Return true if the given string is a palindrome. Otherwise, return false.

### Factorialize a Number

Return the factorial of the provided integer. If the integer is represented with the letter n, a factorial is the product of all positive integers less than or equal to n. Factorials are often represented with the shorthand notation n! For example: 5! = 1 * 2 * 3 * 4 * 5 = 120

### Reverse a String, freeCodeCamp

Reverse the provided string. You may need to turn the string into an array before you can reverse it. Your result must be a string.

### Reverse Arrays with reverse

Use reverse to reverse the array variable and assign it to newArray.

### Sort Arrays with sort

Use sort to sort array from largest to smallest. Further explanation on the .sort() method can be found here

### Filter arrays with filter, freeCodeCamp

Use filter to create a new array with all the values from oldArray which are less than 6. The oldArray should not change.

### Condense Arrays with reduce, freeCodeCamp

Use the reduce method to sum all the values in array and assign it to singleVal.

### Iterate over Arrays with map from freeCodeCamp

The map method will iterate through every element of the array, creating a new array with values that have been modified by the callback function, and return it. Note that it does not modify the original array. In our example the callback only uses the value of the array element (the val argument) but your callback can also include arguments for the index and array being acted on. Use the map function to add 3 to every value in the variable oldArray, and save the results into variable newArray. oldArray should not change.

### Hello World from exercism.io

Hello World The classical introductory exercise. Just say "Hello, World!". "Hello, World!" is the traditional first program for beginning programming in a new language or environment. The objectives are simple: Write a function that returns the string "Hello, World!". Run the test suite and make sure that it succeeds. Submit your solution and check it at the website. If everything goes well, you will be ready to fetch your first real exercise.