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Check if a string is empty or contains only whitespace characters.
Source position: syshelph.inc line 84
public class function TStringHelper.IsNullOrWhiteSpace(  | 
const AValue: string  | 
):Boolean;  | 
IsNullOrEmpty returns True if string A has length 0 or contains only whitespace characters (characters with ASCII code 32 or less).
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Check if a string is empty  | 
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Trim whitespace from the ends of a string.  |