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How to detect if a function is called as constructor?
... a new instance of* x when calling x as a constructor is indistinguishable from a pre-existing instance of x passed as this when calling x as a function, unless you assign a property to every new object created by x as it is constructed:
function x(y) {
var isConstructor = false;
if (this i...
How do you check that a number is NaN in JavaScript?
...amp; 6 both, we can also use this polyfill for Number.isNan
#3
//Polyfill from MDN
Number.isNaN = Number.isNaN || function(value) {
return typeof value === "number" && isNaN(value);
}
// Or
Number.isNaN = Number.isNaN || function(value) {
return value !== value;
}
please chec...
Is returning null bad design? [closed]
I've heard some voices saying that checking for a returned null value from methods is bad design. I would like to hear some reasons for this.
...
Case-insensitive search in Rails model
...
@botbot's comment does not apply to strings from user input. "#$$" is a little-known shortcut for escaping global variables with Ruby string interpolation. It's equivalent to "#{$$}". But string interpolation doesn't happen to user-input strings. Try these in Irb to se...
AWS S3: The bucket you are attempting to access must be addressed using the specified endpoint
...souces using the same client in the same region.
If the bucket is created from AWS S3 Console, then check the region from the console for that bucket then create a S3 Client in that region using the endpoint details mentioned in the above link.
...
How do I fix "The expression of type List needs unchecked conversion…'?
...common problem when dealing with pre-Java 5 APIs. To automate the solution from erickson, you can create the following generic method:
public static <T> List<T> castList(Class<? extends T> clazz, Collection<?> c) {
List<T> r = new ArrayList<T>(c.size());
...
Android Min SDK Version vs. Target SDK Version
...uired for the application to run. The Android system will prevent the user from installing the application if the system's API Level is lower than the value specified in this attribute. You should always declare this attribute.
android:targetSdkVersion
An integer designating the API Level th...
When should I use Inline vs. External Javascript?
...
@callum Google has a different use-case from 99.999999% of websites. Of course they measure extremely carefully and even the smallest difference matters. But just because they found that in their particular use-case, inlining works better (probably because the scri...
Error executing command 'ant' on Mac OS X 10.9 Mavericks when building for Android with PhoneGap/Cor
...anagers, the problem can simply be fixed by downloading the binary release from the apache ANT web site and adding the binary to your system PATH.
For example, on Mountain Lion, in ~/.bash_profile and ~/.bashrc my path was setup like this:
export ANT_HOME="/usr/share/ant"
export PATH=$PATH:$ANT_...
Running junit tests in parallel in a Maven build?
...
From junit 4.7 it's now possible to run tests in parallel without using TestNG. Actually it has been possible since 4.6, but there are a number of fixes being made in 4.7 that will make it a viable option. You may also run pa...