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LINQ Aggregate algorithm explained
...operates on the previous result and the third element and carries forward. etc.
Example 1. Summing numbers
var nums = new[]{1,2,3,4};
var sum = nums.Aggregate( (a,b) => a + b);
Console.WriteLine(sum); // output: 10 (1+2+3+4)
This adds 1 and 2 to make 3. Then adds 3 (result of previous) and 3 ...
Foreign keys in mongo?
...39ae90592692ccc9940"), "group" : "phones" }
You can use that ObjectId in order to do relations between documents.
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Using lambda expressions for event handlers
...actic sugar" and compiles down to the same thing as using delegate syntax, etc.
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What are “sugar”, “desugar” terms in context of Java 8?
...avoid writing an additional statement. They're pure sugar.
+=, |=, &=, etc. are made of the same kind of sugar.
Implicit conversion between primitive types and objects is sugar too.
type inference is sugar too.
Lambda expression, coming with Java 8, is some other kind of sugar (this one not just...
jQuery UI dialog positioning
I am trying to use the jQuery dialog UI library in order to position a dialog next to some text when it is hovered over. The jQuery dialog takes a position parameter which is measured from the top left corner of the current viewport (in other words, [0, 0] will always put it in the upper left h...
How to return a string value from a Bash function
...ntent in $result as shell special characters. I have found that this is an order of magnitude faster than the result=$(some_func "arg1") idiom of capturing an echo. The speed difference seems even more notable using bash on MSYS where stdout capturing from function calls is almost catastrophic.
It'...
Why is using 'eval' a bad practice?
...ode that you don't control, the practical problem of code you can't debug, etc. But an even more important reason is that generally, you don't need to use it. Python exposes so much of its internal mechanisms to the programmer that you rarely really need to write code that writes code.
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What is @ModelAttribute in Spring MVC?
...rs of the form
Step 3 :
@ModelAttribute("student") Student theStudent
We fetch the values being hold by @ModelAttribute and assign the whole bean/object to Student.
Step 4 :
And then we use it as we bid, just like showing it on the page etc like I did
I hope it helps you to understand the concept...
What is the purpose of the var keyword and when should I use it (or omit it)?
... a variable somewhere in the scope chain... Try convincing a Java/C/Python/etc. developer that JavaScript is worthwhile. Ha! C/C++ pitfalls look nice by contrast. Imagine having to debug JavaScript... And some people do that, of course. And there's so much code (and not simple code, mind you) writte...
What is the !! (not not) operator in JavaScript?
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Converts Object to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject // inverted boolean
!!oObject // non inverted boolean so true boolean representation
So !! is not an operator, it's just the ! operator twice.
Real World Example "Test I...