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Get last element of Stream/List in a one-liner
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It is possible to get the last element with the method Stream::reduce. The following listing contains a minimal example for the general case:
Stream<T> stream = ...; // sequential or parallel stream
Optional<T> l...
Detecting an “invalid date” Date instance in JavaScript
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Here's how I would do it:
if (Object.prototype.toString.call(d) === "[object Date]") {
// it is a date
if (isNaN(d.getTime())) { // d.valueOf() could also work
// date is not valid
} else {
// date is valid
}
} else {
// not a ...
Disable same origin policy in Chrome
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Close chrome (or chromium) and restart with the --disable-web-security argument. I just tested this and verified that I can access the contents of an iframe with src="http://google.com" embedded in a page served from "localhost" (tested under chromium 5 / ubuntu). ...
django admin - add custom form fields that are not part of the model
I have a model registered in the admin site. One of its fields is a long string expression. I'd like to add custom form fields to the add/update page of this model in the admin that based on these fields values I will build the long string expression and save it in the relevant model field.
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/etc/apt/sources.list" E212: Can't open file for writing
I am trying to edit sources.list using vi editor but getting the following error while saving the file:
12 Answers
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Hide options in a select list using jQuery
I have an object with key/value pairs of options I want to hide/remove from a select list.
Neither of the following option selectors work. What am I missing?
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Service vs IntentService in the Android platform
I am seeking an example of something that can be done with an IntentService that cannot be done with a Service (and vice-versa)?
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Is Random class thread safe?
Is it valid to share one instance of the Random class between multiple threads? And to call nextInt(int) from multiple threads in particular?
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Difference between SRC and HREF
The SRC and HREF attributes are used to include some external entities like an image, a CSS file, a HTML file, any other web page or a JavaScript file.
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How do I detect if software keyboard is visible on Android Device or not?
...Dianne Hackborn from the Android team has replied. However, you can detect it indirectly by checking if the window size changed in #onMeasure. See How to check visibility of software keyboard in Android?.
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