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Is iterating ConcurrentHashMap values thread safe?
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What does it mean?
That means that each iterator you obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
Wh...
Null check in an enhanced for loop
...st won't fail.
If you get this list from somewhere else and don't know if it is ok or not you could create a utility method and use it like this:
for( Object o : safe( list ) ) {
// do whatever
}
And of course safe would be:
public static List safe( List other ) {
return other == null ...
Node.js throws “btoa is not defined” error
...ed in node. The new directory showed up in my node_modules folder, which itself is in root alongside app.js . Then I made sure to add btoa-atob as a dependency in my package.json file which is in root.
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Choosing between MEF and MAF (System.AddIn)
The Managed Extensibility Framework (MEF) and Managed AddIn Framework (MAF, aka System.AddIn) seem to accomplish very similar tasks. According to this Stack Overflow question, Is MEF a replacement for System.Addin? , you can even use both at the same time.
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Folder structure for a Node.js project
...ctions/modules
/vendor or /support contains 3rd party libraries (added as git
sub-module when using git as source control)
/spec contains specifications for BDD tests.
/tests contains the unit-tests for an application (using a testing
framework, see
here)
NOTE: both /vendor and /support are deprec...
reformat in vim for a nice column layout
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If you're on some kind of UNIX (Linux, etc), you can cheat and filter it through the column(1) command.
:%!column -t
The above will parse on delimiters inside string literals which is wrong, so you will likely need pre-processing steps and specifying the delimiter for this file for example:
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Can an html element have multiple ids?
I understand that an id must be unique within an HTML/XHTML page.
18 Answers
18
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Identify if a string is a number
...follow
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edited Feb 14 at 13:37
Vadim Ovchinnikov
9,91644 gold badges3939 silver badges6969 bronze badges
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Does hosts file exist on the iPhone? How to change it? [closed]
...my Mac, I use the hosts file to change the dns to point to a local server within my local area network.
8 Answers
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Xcode Command /usr/bin/codesign failed with exit code 1 : errSecInternalComponent
...select Lock All Keychains.
Then go back to Xcode and clean and rebuild. It will prompt you for your password again to unlock the keychain.
After this, assuming you have no other compile issues, it will succeed!
share...