Learn data structures such as: LinkedList, Stack, Queue, Binary Search Tree, Hash Map, etc. Once you really understands those data structures, you will find the most efficient way to solve the problems.
Solving them is easy, solving them efficiently is harder.

Practice and practice! :D After completing a kata, try to learn from other solutions and try again by refactoring your code.

Hi all, not sure if I am asking this question in the right topic section - but I completed a kata asking to remove all the strings from a mixed array. I was accidentally logged out when I submitted my solution and once I logged in I could no longer find that kata. I would like to submit my solution! If anyone knows the name for the kata could you let me know please? You need to create a filter function that removes all the strings from a mixed array and returns a new array with only the numbers.
Thanks.

Capitalize the first letters of all words.

When if i can.
i want to help translate.
but where is translate section?
i mean english -> korean translate.

Thanks Yoloswag!

lol so do i, but always remember, if it's stupid but it works , it's not stupid :)

my attempt failed, but the String returned by my solution is the same as what was requested...don't understand

i can't understand question at all.
with my poor english...

so.. code master!
what do i do? capital all first letter in word? or un-capital all first letter in word?

Hey. people. my solution always too long and inefficient.
how can i learn clever solution idea?
is it about natural talent thing?
if i don't have sense of clever code.. is it still okay?