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typeof for RegExp
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You can use instanceof operator:
var t = /^foo(bar)?$/i;
alert(t instanceof RegExp);//returns true
In fact, that is almost the same as:
var t = /^foo(bar)?$/i;
alert(t.constructor == RegExp);//returns true
Keep in mind that as RegExp is not a primi...
Remove elements from collection while iterating
...collecting all the objects that we want to delete (e.g. using an enhanced for loop) and after we finish iterating, we remove all found objects.
ISBN isbn = new ISBN("0-201-63361-2");
List<Book> found = new ArrayList<Book>();
for(Book book : books){
if(book.getIsbn().equals(isbn)){
...
Google MAP API Uncaught TypeError: Cannot read property 'offsetWidth' of null
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This problem is usually due to the map div not being rendered before the javascript runs that needs to access it.
You should put your initialization code inside an onload function or at the bottom of your HTML file, just before the tag, so the DOM is completely rendered before it execute...
Reading output of a command into an array in Bash
... read the output of a command in my script into an array. The command is, for example:
3 Answers
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Difference between hard wrap and soft wrap?
I am in the process of writing a text editor. After looking at other text editors I have noticed that a number of them refer to a "soft" versus "hard" wrap. What is the difference? I can't seem to find the answer by searching.
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How should equals and hashcode be implemented when using JPA and Hibernate
...? What are the common pitfalls? Is the default implementation good enough for most cases? Is there any sense to use business keys?
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Why is an MD5 hash created by Python different from one created using echo and md5sum in the shell?
...will print the same checksum as your python script:
> echo -n mystringforhash | md5sum
86b6423cb6d211734fc7d81bbc5e11d3 -
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How to run `rails generate scaffold` when the model already exists?
...can see all of the options available to you.
Rails:
controller
generator
helper
integration_test
mailer
migration
model
observer
performance_test
plugin
resource
scaffold
scaffold_controller
session_migration
stylesheets
If you'd like to generate a controller scaffol...
Why there is no ConcurrentHashSet against ConcurrentHashMap
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There's no built in type for ConcurrentHashSet because you can always derive a set from a map. Since there are many types of maps, you use a method to produce a set from a given map (or map class).
Prior to Java 8, you produce a concurrent hash set b...
Do zombies exist … in .NET?
... on critical systems expected to be under heavy-load if at all possible in order to avoid the admittedly small possibility of a "zombie thread" crashing a system. I routinely use locking and I didn't know what a "zombie thread" was, so I asked. The impression I got from his explanation is that a z...