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Pass Variables by Reference in Javascript
...tant to note that "pass-by-reference" is a very specific term. It does not mean simply that it's possible to pass a reference to a modifiable object. Instead, it means that it's possible to pass a simple variable in such a way as to allow a function to modify that value in the calling context. So:
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Design Pattern for Undo Engine
...this once and it worked very slick. The biggest thing you have to do is avoid the direct use of pointers or references in the model.
Every reference to another object uses some identifier (like an integer). Whenever the object is needed, you lookup the current definition of the object from a table....
How to tell if a JavaScript function is defined
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@quixoto - understood, I guess what I mean is that you still need to have a string regardless - I would rather not have any more literal strings littering my code than absolutely needed; therefore, this isn't my ideal for testing if something is a function.
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How to scroll the window using JQuery $.scrollTo() function
...it's not working why don't you try using jQuery's scrollTop method?
$("#id").scrollTop($("#id").scrollTop() + 100);
If you're looking to scroll smoothly you could use basic javascript setTimeout/setInterval function to make it scroll in increments of 1px over a set length of time.
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Remove NA values from a vector
...E. (That's the common default for many other R functions, including sum(), mean(), etc.)
Setting na.rm=TRUE does just what you're asking for:
d <- c(1, 100, NA, 10)
max(d, na.rm=TRUE)
If you do want to remove all of the NAs, use this idiom instead:
d <- d[!is.na(d)]
A final note: Othe...
Objective-C pass block as parameter
...g the * with a ^. One way to pass a block to a method is as follows:
- (void)iterateWidgets:(void (^)(id, int))iteratorBlock;
But as you can see, that's messy. You can instead use a typedef to make block types cleaner:
typedef void (^ IteratorBlock)(id, int);
And then pass that block to a meth...
Should I use encodeURI or encodeURIComponent for encoding URLs?
...ed encoding in it.
encodeURIComponent will encode everything with special meaning, so you use it for components of URIs such as
var world = "A string with symbols & characters that have special meaning?";
var uri = 'http://example.com/foo?hello=' + encodeURIComponent(world);
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What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?
...looking specifically for EJS, so it's on the browser page. But, like TJ said, typeof foo == 'undefined' works. I learned that I could also add a simple !!foo if foo has been defined but is null or empty.
– Aashay Desai
Jun 27 '11 at 6:23
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Difference Between Schema / Database in MySQL
... "schema" as a grouping of database objects is that it overloads the older meaning of the word, e.g. en.wikipedia.org/wiki/Database_schema.
– Mark E. Haase
Mar 2 '16 at 3:28
1
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creating list of objects in Javascript
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var list = [
{ date: '12/1/2011', reading: 3, id: 20055 },
{ date: '13/1/2011', reading: 5, id: 20053 },
{ date: '14/1/2011', reading: 6, id: 45652 }
];
and then access it:
alert(list[1].date);
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