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)
Famous quotes containing the words special and/or methods:
“‘I mean to retire, where
Nobody will have heard about my special skills
And conversation is mainly about the wearther.”
—Eiléan Ní Chuilleanáin (b.1942)
“We are lonesome animals. We spend all our life trying to be less lonesome. One of our ancient methods is to tell a story begging the listener to say—and to feel—”Yes, that’s the way it is, or at least that’s the way I feel it. You’re not as alone as you thought.””
—John Steinbeck (1902–1968)