updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -91,7 +91,7 @@
  * [Area](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Area.test.js)
  * [ArmstrongNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ArmstrongNumber.js)
  * [AverageMean](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/AverageMean.js)
- * [digitSum](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/digitSum.js)
+ * [DigitSum](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/DigitSum.js)
  * [Factorial](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Factorial.js)
  * [Factors](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Factors.js)
  * [Fibonacci](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Fibonacci.js)
@@ -113,12 +113,29 @@
  * [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ReversePolishNotation.js)
  * [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/SieveOfEratosthenes.js)
  * test
+ * [Abs](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Abs.test.js)
  * [ArmstrongNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ArmstrongNumber.test.js)
+ * [AverageMean](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/AverageMean.test.js)
+ * [DigitSum](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/DigitSum.test.js)
+ * [Factorial](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Factorial.test.js)
  * [Factors](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Factors.test.js)
+ * [Fibonacci](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Fibonacci.test.js)
+ * [FindHcf](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/FindHcf.test.js)
+ * [FindLcm](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/FindLcm.test.js)
+ * [GridGet](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/GridGet.test.js)
+ * [MeanSquareError](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/MeanSquareError.test.js)
+ * [ModularBinaryExponentiationRecursive](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ModularBinaryExponentiationRecursive.test.js)
  * [NumberOfDigits](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/NumberOfDigits.test.js)
+ * [Palindrome](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Palindrome.test.js)
+ * [PascalTriangle](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PascalTriangle.test.js)
  * [PerfectCube](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectCube.test.js)
  * [PerfectNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectNumber.test.js)
  * [PerfectSquare](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectSquare.test.js)
+ * [PiApproximationMonteCarlo](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PiApproximationMonteCarlo.test.js)
+ * [Polynomial](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Polynomial.test.js)
+ * [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PrimeCheck.test.js)
+ * [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ReversePolishNotation.test.js)
+ * [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/SieveOfEratosthenes.test.js)
 
 ## Project-Euler
  * [Problem1](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem1.js)
@@ -167,9 +184,7 @@
 
 ## String
  * [CheckAnagram](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckAnagram.js)
- * [CheckAnagram](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckAnagram.test.js)
  * [CheckPalindrome](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckPalindrome.js)
- * [CheckPalindrome](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckPalindrome.test.js)
  * [CheckRearrangePalindrome](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckRearrangePalindrome.js)
  * [CheckVowels](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckVowels.js)
  * [CheckVowels](https://github.com/TheAlgorithms/Javascript/blob/master/String/CheckVowels.test.js)
@@ -182,13 +197,16 @@
  * [MaxCharacter](https://github.com/TheAlgorithms/Javascript/blob/master/String/MaxCharacter.js)
  * [MaxCharacter](https://github.com/TheAlgorithms/Javascript/blob/master/String/MaxCharacter.test.js)
  * [PatternMatching](https://github.com/TheAlgorithms/Javascript/blob/master/String/PatternMatching.js)
- * [PatternMatching](https://github.com/TheAlgorithms/Javascript/blob/master/String/PatternMatching.test.js)
  * [PermutateString](https://github.com/TheAlgorithms/Javascript/blob/master/String/PermutateString.js)
  * [PermutateString](https://github.com/TheAlgorithms/Javascript/blob/master/String/PermutateString.test.js)
  * [ReverseString](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseString.js)
- * [ReverseString](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseString.test.js)
  * [ReverseWords](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseWords.js)
- * [ReverseWords](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseWords.test.js)
+ * test
+ * [CheckAnagram](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckAnagram.test.js)
+ * [CheckPalindrome](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckPalindrome.test.js)
+ * [PatternMatching](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/PatternMatching.test.js)
+ * [ReverseString](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/ReverseString.test.js)
+ * [ReverseWords](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/ReverseWords.test.js)
 
 ## Timing-Functions
  * [IntervalTimer](https://github.com/TheAlgorithms/Javascript/blob/master/Timing-Functions/IntervalTimer.js)