Document new TFraction.Hash method

Author: delphidabbler

Fractions/0/API/TFraction-Hash.md

@@ -0,0 +1,31 @@
+# Hash method
+
+**Project:** [Fractions](../API.md)
+
+**Unit:** _DelphiDabbler.Lib.Fractions_
+
+**Record:** [_TFraction_](./TFraction.md)
+
+**Applies to:** ~>0.2
+
+```pascal
+function Hash: Integer;
+```
+
+## Description
+
+Computes and returns a hash value for the fraction as an _Integer_.
+
+If two fractions that simplify to the same fraction have the same hash.
+
+### Example
+
+```pascal
+var
+  F, G: TFraction;
+begin
+  F := TFraction.Create(1, 2);
+  G := TFraction.Create(3, 6);
+  Assert(F.Hash = G.Hash);
+end;
+```

Fractions/0/API/TFraction.md

@@ -79,6 +79,7 @@ _TFraction_ defines several methods. Some are static class methods that operate
 | [_CompareTo_](./TFraction-CompareTo.md) | Compares the fraction to another and returns a value indicating which fraction is greatest or if they are equal. |
 | [_Convert_](./TFraction-Convert.md) | Converts the fraction into an equivalent one in which the numerator and denominator are a given integer multiple of their original values. |
 | [_HasCommonFactor_](./TFraction-HasCommonFactor.md) | Checks if a given integer is a common factor of the fraction. |
+| _[Hash](./TFraction-Hash.md) [~>0.2]_ | Computes a hash for the fraction. |
 | [_IsProper_](./TFraction-IsProper.md) | Checks if the fraction is a proper fraction. |
 | [_IsWholeNumber_](./TFraction-IsWholeNumber.md) | Checks if the fraction represents a whole number. |
 | _[Power](./TFraction-Power.md) [~>0.2]_ | Computes an integer power of a fraction (overloaded with class method). |