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Interface type check with Typescript
...'bar';
barProperty: number;
}
let object: Foo | Bar;
// You will see errors if `strictNullChecks` is enabled.
if (object.type === 'foo') {
// object has type `Foo`.
object.fooProperty;
} else {
// object has type `Bar`.
object.barProperty;
}
And it works with switch too.
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How do I uniquely identify computers visiting my web site?
..., fingerprints changed quite
rapidly, but even a simple heuristic was usually able to guess when a fingerprint was an “upgraded” version of a previously observed browser’s
fingerprint, with 99.1% of guesses correct and a false positive rate of only
0.86%.
We discuss what privacy thr...
Static class initializer in PHP
I have an helper class with some static functions. All the functions in the class require a ‘heavy’ initialization function to run once (as if it were a constructor).
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@synthesize vs @dynamic, what are the differences?
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I was getting NSUnknownKeyException errors with my dynamic property when I removed the @synthesize line (Xcode 3.2 was giving me an error b/c I had no matching ivar for my @property). Adding @dynamic fixed the issue - compiles and runs fine now. Thanks!
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Simplest way to read json from a URL in java
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Why i am getting this error "The constructor JSONObject(String) is undefined" in the line of JSONObject json = new JSONObject(jsonText); in "readJsonFromUrl" method..? @RolandIllig
– Karthick pop
Nov 5 '14 at...
How to make layout with rounded corners..?
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How do you avoid the error Element shape doesn't have the required attribute android:layout_height?
– Lorenz
Jul 31 '15 at 13:38
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Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
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edited Jan 20 '11 at 23:05
answered Jan 19 '11 at 13:43
A...
What happens if a finally block throws an exception?
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@HenkHolterman: Disk-full errors aren't very common on a directly-connected primary hard disk, but programs sometimes write files to removable or networked disks; problems can be much more common with those. If someone yanks out a USB stick before a ...
Associative arrays in Shell scripts
... I'm using something like this. What's the best way to "catch" the error where the array index/subscript doesn't exist? For example, what if I was taking the subscript as a command line option, and the user made a typo and entered "designatio"? I get a "bad array subscript" error but don't...
Reset AutoIncrement in SQL Server after Delete
...ONSTRAINT all" -- Enable All the constraints back
-- You may ignore the errors that shows the table without Auto increment field.
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