Is not a bad solution, but what he is doing with the for loop + if is the definition of Array.filter(), so this is unnecessarily large, you should always use .filter() in this situation.

What is the time complexity for this?

Agree. This should be the best practice. Easy to understand and light to perform.

Easy representation of the keypad. I love it.

yes, you could :

• aggregate the two last entries of "english" with a .join(" and ") before the final step
• search for the lastIndexOf(',') and add "and" at that position
• pop() the last sentence of english, .join(','), than add "and" + last sentence
• ...

My choice fot the regex is that I could inline it and also it works with only oue group without puting in more conditions.

Guess i just forgot to remove it. oopsie.

Superb

Superb

Love this simple solution . Easy to understand.

I LOVE THIS ! So simple. GENIUS solution. Thank you very much.