Special Methods
| String representation | Object copy | Value equality | Object comparison | Hash code | Object ID | ||
|---|---|---|---|---|---|---|---|
| Human-readable | Source-compatible | ||||||
| ABAP Objects | |||||||
| C++ (STL) | x == y | ||||||
| C# | x.ToString | x.Clone | x.Equals(y) | x.CompareTo(y) | x.GetHashCode | ||
| Java | x.toString | x.clone | x.equals(y) | x.compareTo(y) | x.hashCode | System.identityHashCode(x) | |
| JavaScript | x.toString | ||||||
| D | x.toString or std.conv.to!string(x) |
x.stringof | x == y | x.toHash | |||
| Objective-C (Cocoa) | |||||||
| Smalltalk | x displayString | x printString | x copy | x = y | x hash | x identityHash | |
| Python | str(x) | repr(x) | copy.copy(x) | x == y | cmp(x, y) | hash(x) | id(x) |
| Visual Basic .NET | x.ToString | x.Clone | x.Equals(y) | x.CompareTo(y) | x.GetHashCode | ||
| Eiffel | x.out | x.twin | x.is_equal(y) | When x is COMPARABLE, one can simply do x < y | When x is HASHABLE, one can simply do x.hash_code | When x is IDENTIFIED, one can simply do x.object_id | |
| PHP | sprintf("%s", x) | clone x | x == y | spl_object_hash(x) | |||
| Perl | "$x" | Data::Dumper->Dump(,) | Storable::dclone($x) | Scalar::Util::refaddr( $x ) | |||
| Perl 6 | ~x | x.perl | x.clone | x eqv y | x cmp y | x.WHICH | |
| Ruby | x.to_s | x.inspect | x.dup or x.clone |
x == y or x.eql?(y) |
x <=> y | x.hash | x.object_id |
| Windows PowerShell | x.ToString | x.Clone | x.Equals(y) | x.CompareTo(y) | x.GetHashCode | ||
| OCaml | Oo.copy x | x = y | Hashtbl.hash x | Oo.id x | |||
| F# | string x or x.ToString or sprintf "%O" x | sprintf "%A" x | x.Clone | x = y or x.Equals(y) | compare x y or x.CompareTo(y) | hash x or x.GetHashCode | |
Read more about this topic: Comparison Of Programming Languages (object-oriented Programming)
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