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What does the “map” method do in Ruby?
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map, along with select and each is one of Ruby's workhorses in my code.
It allows you to run an operation on each of your array's objects and return them all in the same place. An example would be to increment an array of numbers by one:
[...
How to query nested objects?
...ndividual fields in the subdocument:
Equality matches within subdocuments select documents if the subdocument matches exactly the specified subdocument, including the field order.
In the following example, the query matches all documents where the value of the field producer is a subdocument tha...
Using JQuery to check if no radio button in a group has been checked
... answer worked for me reliably to check whether a radio button group had a selected value. Best answer in the thread.
– Andy Cook
Apr 29 '13 at 19:21
1
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VS2012 return to a normal TFS checkin window?
...n the Pending Changes filter is applied, all or some of the files could be selected and right clicked and then there is an option to do the check in. That command takes directly to the Team Explorer in Pending Changes view. See below...
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How to search for occurrences of more than one space between words in a line
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This regex selects all spaces, you can use this and replace it with a single space
\s+
example in python
result = re.sub('\s+',' ', data))
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How can I auto increment the C# assembly version via our CI platform (Hudson)?
...d an existing item to you project (wait... read on before adding the file)
Select the file and before you click Add, click the dropdown next to the add button and select "Add As Link".
Repeat steps 5 and 6 for all existing and new projects in the solution
When you add the file as a link, it stores...
DateTime2 vs DateTime in SQL Server
...= '5/5/2010 23:59:59.999'
declare @d3 datetime = '5/5/2010 23:59:59.997'
select @d1 as 'IAmMay6BecauseOfRounding', @d2 'May5', @d3 'StillMay5Because2msEarlier'
Avoiding this implicit rounding is a significant reason to move to DateTime2. Implicit rounding of dates clearly causes confusion:
St...
git diff file against its last change
...mit in the list. This also works for directories, but then you also get to select the file to diff for the selected commit. Super useful!
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Union Vs Concat in Linq
...ence is not changed.
If you will override Equals and GetHashCode (used to select distinct items), then items will not be compared by reference:
class X
{
public int ID { get; set; }
public override bool Equals(object obj)
{
X x = obj as X;
if (x == null)
re...
jQuery attr vs prop?
...ns (<1.6), we just had attr. To get to DOM properties such as nodeName, selectedIndex, or defaultValue you had to do something like:
var elem = $("#foo")[0];
if ( elem ) {
index = elem.selectedIndex;
}
That sucked, so prop was added:
index = $("#foo").prop("selectedIndex");
This was great, bu...