What does the exclamation mark do before the function?

javascriptfunction
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How do I modify a pointer that has been passed into a function in C?

c#functionpass-by-valuepointersparameters
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What is the difference between a function call and function reference?

javascriptfunctionreferencecall
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Table name as a PostgreSQL function parameter

functionpostgresqlidentifierplpgsqldynamic-sql
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How are lambdas useful? [closed]

closuresfunctionpythonlambda
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