if statement - Not Operator in Javascript gives Unexpected Token Error -

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using not operator (!) in conditional gives me:

"uncaught syntaxerror: unexpected token !"

if (text.includes(input[j])) {    $(messages[i]).hide(); } else if !(text.includes(input[j])) {    $(messages[i]).show(); }

why isn't ! working here?

! should within ():

else if (!text.includes(input[j]))

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