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How is pattern matching in Scala implemented at the bytecode level?
...but see below about custom extractors
case "hello" // equality check
case _ : Foo // instance of check
case x => // assignment to a fresh variable
case _ => // do nothing, this is the tail else on the if/else
There's much more that you can do with patterns like or patterns and combinations ...
Dual emission of constructor symbols
...rding to the ABI, the mangled name for your Thing::foo() is easily parsed:
_Z | N | 5Thing | 3foo | E | v
prefix | nested | `Thing` | `foo`| end nested | parameters: `void`
You can read the constructor names similarly, as below. Notice how the constructor "name" isn't given, but ...
how to check redis instance version?
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redis-cli INFO SERVER | grep redis_version
– Andriy Tolstoy
Dec 23 '19 at 11:36
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Loading and parsing a JSON file with multiple JSON objects
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@Pi_: you'll have a dictionary, so just access the fields as keys: data = json.loads(line); print data[u'votes']
– Martijn Pieters♦
Sep 16 '12 at 23:26
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How do you set a default value for a MySQL Datetime column?
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mysql> create table test (str varchar(32), ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
Query OK, 0 rows affected (0.00 sec)
mysql> desc test;
+-------+-------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+...
Check if two unordered lists are equal [duplicate]
...hat appear identical but are not evaluating as equal (as I did), check the __hash__ function of those objects to verify that equal objects have equal hashes. Mine did not.
– Paul Wintz
Dec 16 '19 at 12:01
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include external .js file in node.js app
...);
vm.runInThisContext(code, path);
}.bind(this);
includeInThisContext(__dirname+"/models/car.js");
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How to assign from a function which returns more than one value?
... this purpose. For example within the function you would have
x = desired_return_value_1 # (vector, matrix, etc)
y = desired_return_value_2 # (vector, matrix, etc)
returnlist = list(x,y...)
} # end of function
main program
x = returnlist[[1]]
y = returnlist[[2]]
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Get Enum from Description attribute [duplicate]
...ags.Static))". Otherwise in the else below, the name of the field is 'value__' instead of the real name.
– Dennis
Mar 15 '19 at 8:28
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JavaScript Date Object Comparison
...answered Sep 30 '11 at 6:50
gion_13gion_13
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