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What is the difference between self-types and trait subclasses?
...r) where it mentions:
In the spreadsheet example, class Model inherits from Evaluator and
thus gains access to its evaluation method. To go the other way, class
Evaluator defines its self type to be Model, like this:
package org.stairwaybook.scells
trait Evaluator { this: Model => ...
...
Static/Dynamic vs Strong/Weak
...istinguished (e.g. whether the language tries to do an implicit conversion from strings to numbers).
See the wiki-page for more detailed information.
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Fastest way to iterate over all the chars in a String
...d this first: http://www.javaspecialists.eu/archive/Issue237.html
Starting from Java 9, the solution as described won't work anymore, because now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'ch...
How to tell if node.js is installed or not
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@user1340052, exec() returns the last line from the output, so you should be fine there. php.net/manual/en/function.exec.php
– Brad
May 7 '12 at 2:37
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What are the -Xms and -Xmx parameters when starting JVM?
...the JVM can/will use more memory than just the size allocated to the heap. From Oracle's documentation:
Note that the JVM uses more memory than just the heap. For example Java methods, thread stacks and native handles are allocated in memory separate from the heap, as well as JVM internal data s...
Use email address as primary key?
...nt comparison. However, this does not matter if you simply retrieve a user from the database using the e-mail address. It does matter if you have complex queries with multiple joins.
If you store information about users in multiple tables, the foreign keys to the users table will be the e-mail addr...
Maven2 property that indicates the parent directory
...ou build the whole project or a sub-module.
It works whether you run maven from the root folder or a sub-module.
There's no need to set a relative path property in each and every sub-module!
The plugin lets you set a property of your choice to the absolute-path of any of the project's modules. In ...
Placeholder in UITextView
...de a few minor modifications to bcd's solution to allow for initialization from a Xib file, text wrapping, and to maintain background color. Hopefully it will save others the trouble.
UIPlaceHolderTextView.h:
#import <Foundation/Foundation.h>
IB_DESIGNABLE
@interface UIPlaceHolderTextView :...
StringUtils.isBlank() vs String.isEmpty()
...ull). This is totally different than just checking if the string is empty.
From the linked documentation:
Checks if a String is whitespace, empty ("") or null.
StringUtils.isBlank(null) = true
StringUtils.isBlank("") = true
StringUtils.isBlank(" ") = true
StringU...
Nested defaultdict of defaultdict
..., thanks. Could you please extend it to the case, that the data are loaded from json into defaultdict of defaultdict?
– David Belohrad
Mar 4 '17 at 20:52
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