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In Functional Programming, what is a functor?
...e reading various articles on functional programming, but the authors typically assume the reader already understands the term. Looking around on the web has provided either excessively technical descriptions (see the Wikipedia article ) or incredibly vague descriptions (see the section on Functors...
Show an image preview before upload
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HTML5 comes with File API spec, which allows you to create applications that let the user interact with files locally; That means you can load files and render them in the browser without actually having to upload the files. Part of the File API is the FileReader...
How does the paste image from clipboard functionality work in Gmail and Google Chrome 12+?
...define a "paste" event handler and look at event.clipboardData.items, and call getAsFile() on them to get a Blob. Once you have a Blob, you can use FileReader on it to see what's in it. This is how you can get a data url for the stuff you just pasted in Chrome:
// window.addEventListener('paste',...
ViewParam vs @ManagedProperty(value = “#{param.id}”)
...alues. Since JSF 2.2 you could use <f:viewAction> for that instead.
Allows for nested <f:converter> and <f:validator> for more fine-grained conversion/validation. Even a <h:message> can be attached.
Can be included as GET query string using includeViewParams attribute of &l...
How to resolve “You need to have Ruby and Sass installed and in your PATH for this task to work” War
I am in the process of setting up a new Mac for work. I have installed Grunt & Grunt CLI globally. Then I did a npm install inside a project folder to install all dependencies.
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Plugin execution not covered by lifecycle configuration (JBossas 7 EAR archetype)
...unpacked to the target folder. You'd not want that to be re-done "incrementally" upon saving each source file. Or maybe you do want that. Really, m2e has no idea about your specific build. You can store what m2e should do in Eclipse, POM, or possibly install a m2e connector that adds more knowledge ...
Get current batchfile directory
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System read-only variable %CD% keeps the path of the caller of the batch, not the batch file location.
You can get the name of the batch script itself as typed by the user with %0 (e.g. scripts\mybatch.bat). Parameter extensions can be applied to this so %~dp0 will return the D...
Does it make sense to do “try-finally” without “catch”?
...you want the currently executing method to still throw the exception while allowing resources to be cleaned up appropriately. Below is a concrete example of handling the exception from a calling method.
public void yourOtherMethod() {
try {
yourMethod();
} catch (YourException ex) {...
Difference between .keystore file and .jks file
...y. Some application use a keystore file stored in $HOME/.keystore: it's usually implied that it's a JKS file, since JKS is the default keystore type in the Sun/Oracle Java security provider. Not everyone uses the .jks extension for JKS files, because it's implied as the default. I'd recommend using ...
How do I set the maximum line length in PyCharm?
...hy the default value is set to 120 characters. PEP 8 clearly states: Limit all lines to a maximum of 79 characters.
– Krøllebølle
Nov 12 '14 at 8:20
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