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What does map(&:name) mean in Ruby?
...(&:name.to_proc).join(' ')
If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block.
The Symbol#to_proc method was originally added by ActiveSupport but has been integrated into Ruby 1.8.7. This is i...
Print number of keys in Redis
...this, do this on a production box some day without thinking it through and then push it over the edge...probably has already happened.
– Stu Thompson
Mar 3 '15 at 16:20
2
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PSQLException: current transaction is aborted, commands ignored until end of transaction block
..., and you gobbled up that failure and ignored it. But that wasn't enough, THEN you used that same connection, using the SAME TRANSACTION to run another query. The exception gets thrown on the second, correctly formed query because you are using a broken transaction to do additional work. PostgreS...
How to find day of week in php in a specific timezone
...this question when searching how to get the day of the week(as I did), and then vote it up, because it answers their question :)
– dav
May 20 '14 at 16:28
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Arrays, heap and stack and value types
...d int[], like this:
RefType refType;
ValType valType;
int[] intArray;
then your stack might look like this:
0 ┌───────────────────┐
│ refType │
4 ├───────────────────┤
│ valType ...
REST API 404: Bad URI, or Missing Resource?
... 200 with a null you are going against the HTTP Spec. You can do this, but then your api will not adhere to the "Uniformed Interface" Constraint of REST.
– suing
Mar 29 '12 at 20:20
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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
...ld just be equal to x.) The new array object will have a different shape then x and maybe a different starting offset into the buffer, but will share the strides with x (in this case at least):
y.shape
(2,2)
y.strides
(16, 4)
This way, computing the memory offset for y[i,j] will yield the corre...
How to convert OutputStream to InputStream?
...ibility.
If the output stream that is exposed is a ByteArrayOutputStream, then you can always get the full contents by calling the toByteArray() method. Then you can create an input stream wrapper by using the ByteArrayInputStream sub-class. These two are pseudo-streams, they both basically just wr...
AngularJS - convert dates in controller
...s.angularjs.org/api/ng.filter:date
But if you are using HTML5 type="date" then the ISO format yyyy-MM-dd MUST be used.
item.dateAsString = $filter('date')(item.date, "yyyy-MM-dd"); // for type="date" binding
<input type="date" ng-model="item.dateAsString" value="{{ item.dateAsString }}" patt...
How to debug stream().map(…) with lambda expressions?
...re's a lambda, you actually will hit once when the pipeline is set up, and then once for each stream element. Using your example, the first time you hit the breakpoint will be the map() call that's setting up the stream pipeline:
You can see the call stack and the local variables and parameter va...