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What is a “Bitmap heap scan” in a query plan?
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The best explanation comes from Tom Lane, which is the algorithm's author unless I'm mistaking. See also the wikipedia article.
In short, it's a bit like a seq scan. The difference is that, rather than visiting every disk page, a bitmap index sc...
Why does [5,6,8,7][1,2] = 8 in JavaScript?
... delimited list of operands, but a single expression.
Read more about the comma operator here.
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SQL set values of one column equal to values of another column in the same table
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Incompatible implicit declaration of built-in function ‘malloc’
... ahh thanks :) still getting the hang of C, first C program coming from java :)
– SGE
Aug 13 '11 at 13:53
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TypeScript type signatures for functions with variable argument counts
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How do I access the command history from IDLE?
On bash or Window's Command Prompt, we can press the up arrow on keyboard to get the last command, and edit it, and press ENTER again to see the result.
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Simplest way to check if key exists in object using CoffeeScript
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key of obj
This compiles to JavaScript's key in obj. (CoffeeScript uses of when referring to keys, and in when referring to array values: val in arr will test whether val is in arr.)
thejh's answer is correct if you want to ignore the objec...
Determine if an object property is ko.observable
...ervable(). You can call it like ko.isObservable(vm[key]).
Update from comment:
Here is a function to determine if something is a computed observable:
ko.isComputed = function (instance) {
if ((instance === null) || (instance === undefined) || (instance.__ko_proto__ === undefined)) return ...