System.SysUtils.TStringHelper.GetHashCode

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Delphi

function GetHashCode: Integer;

Properties

Type	Visibility	Source	Unit	Parent
function	public	System.SysUtils.pas	System.SysUtils	TStringHelper

Description

Returns the hash code for this string.

Note: If two strings are equal, this method returns identical values. However, there is not a unique hash code for each particular string value. Different strings can return the same hash code.

Since RAD Studio Sydney the TStringHelper.GetHashCode member no longer creates an uppercase version of the string before calculating the hashcode.

Therefore, strings that differ only in case will produce different hash codes. To illustrate:

 if 'Hello'.GetHashCode = 'HELLO'.GetHashCode then
   ShowMessage('True')
 else
   ShowMessage('False');

The above showed the 'True' message in earlier versions. Starting RAD Studio Sydney, it shows 'False'.

See Also

• System.SysUtils.TStringHelper