How to uppercase for my Array list word only

How to uppercase for my Array list word only

i've two textarea if user type something first textarea my array list check if this word in array list so uppercase those word else word as it lowercase  for eg

 var arr[]=['CRATE','TABLE','PRIMARY','IDENTITY']
<textarea id="txta" style="width:600px;height:500px"></textarea>
<button type="button" value="Sumit" id="btn" >Submit</button>
<textarea id="txta1" style="width:600px;height:500px"></textarea>

if user type

create table info(
int id primary key identity(1,1)
)

output below as

CREATE TABLE info
(
int id PRIMARY key IDENTITY(1,1)
)