This is the JavaScript utility for below functionality –

1. ArrayFirstElement :_.first is an array method that returns the first element of an array. Passing n will return the first n elements of the array.
2. ArrayLastElement :_.last is an array method that returns the first element of an array. Passing n will return the first n elements of the array.
3. ArrayUniqElement :_.uniq is an array method that that produces a duplicate-free version of the array
4. Base64ToString : Base64 encoded value to convert in plain string decode.  
5. StringToBase64 : Plain string value to convert in Base64 encode
6. BinaryToBase64 : Binary data decoded to Base64 encoded.
7. Base64ToBinary : Base64 value encoded to binary decoded.
8. JsonButify: Json string formatting in readable format
9. JsonMinify: Json string removing the white spaces reduce the size.
10. JsonToXML: Json to Xml format
11. FindDuplicateWord : Find Duplicated Word in string 
12. FindRepeatedChar : Find Repeated  Character
13. JoinString : Join the list to  single string 
14. SplitString : String( having the separator value) convert to list