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JavaScript challenges and problems

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Used correct variable names for the odd even sum problem

I just removed the -1 on reverseString function on the for loop and changed the >= 0 to > 0. I think is more elegant this way

added is palindrome solution

Solution of missingLetters that also return consecutively missed letters. All other solutions have this drawback.

This solution uses recursion to flatten any depth of nested array (without using the built-in flat() method).

find length of array using at, use ternary operator to push values to array

adding another way to reverse a string