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Array.size() vs Array.length
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.size() is jQuery's, much probably you're either confusing with or took from someone else who had imported the jQuery library to his project.
If you'd have jQuery imported and you'd write like $(array).size(), it would return the array length.
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Examples of GoF Design Patterns in Java's core libraries
...ch doesn't clone the items, but uses them. The java.util.Collections#newSetFromMap() and singletonXXX() methods however comes close.
Composite (recognizeable by behavioral methods taking an instance of same abstract/interface type into a tree structure)
java.awt.Container#add(Component) (practical...
Using GCC to produce readable assembly?
...r highlighting of corresponding source / asm lines. How to remove "noise" from GCC/clang assembly output?
– Peter Cordes
May 9 at 19:16
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How can I count text lines inside an DOM element? Can I?
... the div's size is dependent on the content (which I assume to be the case from your description) then you can retrieve the div's height using:
var divHeight = document.getElementById('content').offsetHeight;
And divide by the font line height:
document.getElementById('content').style.lineHeight...
how to break the _.each function in underscore.js
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You can't break from the each method—it emulates the native forEach method's behavior, and the native forEach doesn't provide to escape the loop (other than throwing an exception).
However, all hope is not lost! You can use the Array.ever...
In PHP, what is a closure and why does it use the “use” identifier?
...e's value changes.
Variables defined inside the closure are not accessible from outside the closure either.
Closures and functions have the same speed. Yes, you can use them all over your scripts.
As @Mytskine pointed out probably the best in-depth explanation is the RFC for closures. (Upvote him ...
Relative frequencies / proportions with dplyr
...2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That makes it easy to progressively roll-up a dataset.
Thus, after the summarise, the last grouping variab...
Is there a difference between “raise exception()” and “raise exception” without parenthesis?
.... This first form auto instantiates your exception.
The relevant section from the docs says, "raise evaluates the first expression as the exception object. It must be either a subclass or an instance of BaseException. If it is a class, the exception instance will be obtained when needed by instant...
Foreign keys in mongo?
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Ok, but how can I get cource name data from student collection? db.student.find() will return something like courses: [ { course: 'bio101', mark: 85 } ]
– Mark Pegasov
Jun 13 '11 at 18:09
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PHP function to generate v4 UUID
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Taken from this comment on the PHP manual, you could use this:
function gen_uuid() {
return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low"
mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),...