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Difference between HashMap, LinkedHashMap and TreeMap
...e entries were put into the map
"Hashtable" is the generic name for hash-based maps. In the context of the Java API,
Hashtable is an obsolete class from the days of Java 1.1 before the collections framework existed. It should not be used anymore, because its API is cluttered with obsolete methods ...
How to convert a string to integer in C?
...
Robust C89 strtol-based solution
With:
no undefined behavior (as could be had with the atoi family)
a stricter definition of integer than strtol (e.g. no leading whitespace nor trailing trash chars)
classification of the error case (e.g. to...
Using NSPredicate to filter an NSArray based on NSDictionary keys
...Swift 3, when you want to filter an array of dictionaries with a predicate based on dictionary keys and values, you may choose one of the following patterns.
#1. Using NSPredicate init(format:arguments:) initializer
If you come from Objective-C, init(format:arguments:) offers a key-value coding ...
How to update two tables in one statement in SQL Server 2005?
...
@unknown: Based on your comment, you would need to join across both Table1 and Table2 when you update Table2 if your update query needs the keys from a third table. Regardless of that, you still need to do two separate updates.
...
Formula px to dp, dp to px android
...
Note: The widely used solution above is based on displayMetrics.density. However, the docs explain that this value is a rounded value, used with the screen 'buckets'. Eg. on my Nexus 10 it returns 2, where the real value would be 298dpi (real) / 160dpi (default) =...
Why should I use a pointer rather than the object itself?
...ymorphic types, pointers (or references) are used to avoid slicing:
class Base { ... };
class Derived : public Base { ... };
void fun(Base b) { ... }
void gun(Base* b) { ... }
void hun(Base& b) { ... }
Derived d;
fun(d); // oops, all Derived parts silently "sliced" off
gun(&d); // OK...
How can I create an object based on an interface file definition in TypeScript?
...ect like this
const modal: IModal = {} as IModal;
Or a default instance based on the interface and with sensible defaults, if any
const defaultModal: IModal = {
content: "",
form: "",
href: "",
$form: {} as JQuery,
$message: {} as JQuery,
$modal: {} as JQuery,
$submit...
Is there a code obfuscator for PHP? [closed]
...tespace($infile);
// compress data
$data=gzcompress($data,9);
// encode in base64
$data=base64_encode($data);
// generate output text
$out='<?ob_start();$a=\''.$data.'\';eval(gzuncompress(base64_decode($a)));$v=ob_get_contents();ob_end_clean();?>';
// write output text
file_put_contents($outfi...
Is floating point math broken?
...ary floating point math is like this. In most programming languages, it is based on the IEEE 754 standard. The crux of the problem is that numbers are represented in this format as a whole number times a power of two; rational numbers (such as 0.1, which is 1/10) whose denominator is not a power of ...
Getting distance between two points based on latitude/longitude
...you should use geopy.distance.distance() instead!
The answers above are based on the Haversine formula, which assumes the earth is a sphere, which results in errors of up to about 0.5% (according to help(geopy.distance)). Vincenty distance uses more accurate ellipsoidal models such as WGS-84, and...