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Why does Haskell's “do nothing” function, id, consume tons of memory?
...
We know the type of id,
id :: a -> a
And when we specialize this for id id, the left copy of id has type:
id :: (a -> a) -> (a -> a)
And then when you specialize this again for the leftmost id in id id id, you get:
id :: ((a -> a) -> (...
Addressing localhost from a VirtualBox virtual machine [closed]
...ollowing:
Shut your virtual machine down.
Go to VirtualBox Preferences -> Network -> Host-only Networks -> click the "+" icon. Click OK.
Select your box and click the "Settings" icon -> Network -> Adapter 2 -> On the "Attached to:" dropdown, select "Host-only Adapter" and your ne...
TypeError: ObjectId('') is not JSON serializable
...
>>> from bson import Binary, Code
>>> from bson.json_util import dumps
>>> dumps([{'foo': [1, 2]},
... {'bar': {'hello': 'world'}},
... {'code': Code("function x() { return 1; }")},
......
How can I parse a string with a comma thousand separator to a number?
... '.';
strg = strg.replace(/[^0-9$.,]/g, '');
if(strg.indexOf(',') > strg.indexOf('.')) decimal = ',';
if((strg.match(new RegExp("\\" + decimal,"g")) || []).length > 1) decimal="";
if (decimal != "" && (strg.length - strg.indexOf(decimal) - 1 == 3) && strg.indexO...
BACKUP LOG cannot be performed because there is no current database backup
...ed the backup file to my new empty database:
Right click on Databases > Restore Database > General : Device: [the
path of back up file] → OK
This was wrong. I shouldn't have first created the database.
Now, instead, I do this:
Right click on Databases > Restore Database > ...
How to move out of auto-completed brackets in IntelliJ IDEA (without using the arrow keys)?
...
The feature is disabled by default, you can enable it in
Settings -> Editor -> General -> Smart Keys -> Jump outside closing
bracket/quote with Tab
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How to check whether an object is a date?
...myRealDate.typof('Date')) { /* do things */ }
alert( myDate.typof() ); //=> String
[Edit march 2013] based on progressing insight this is a better method:
Object.prototype.is = function() {
var test = arguments.length ? [].slice.call(arguments) : null
,self = this.constructo...
How to add external library in IntelliJ IDEA?
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Intellij IDEA 15:
File->Project Structure...->Project Settings->Libraries
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Eclipse: The declared package does not match the expected package
...had issues.
Then I removed the folder from the build path and tried File > Import... > General > File System > click Next > From Directory > Browse... to folder above name1 > click Advanced button > check Create links in workspace > click Finish button.
...
Understanding implicit in Scala
... required and it finds a B, it will look for an implicit value of type B => A in scope (it also checks some other places like in the B and A companion objects, if they exist). Since defs can be "eta-expanded" into Function objects, an implicit def xyz(arg: B): A will do as well.
So the differenc...