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When to use a key/value store such as Redis instead/along side of a SQL database?
I have read great things about key/value stores such as Redis but I can't seem to figure out when it's time to use it in an application.
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Deep copying an NSArray
...if you need to deeply copy an entire nested data structure — what the linked Apple docs call a true deep copy — then this approach will not suffice. Please see the other answers here for that.
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Debugging “Element is not clickable at point” error
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This is caused by following 3 types:
1.The element is not visible to click.
Use Actions or JavascriptExecutor for making it to click.
By Actions:
WebElement element = driver.findElement(By("element_path"));
Actions actions = new Actions(driver);
actions.moveToElement(element).click().perform(...
AWS MySQL RDS vs AWS DynamoDB [closed]
...u can read AWS explanation about it here.
In short, if you have mainly Lookup queries (and not Join queries), DynamoDB (and other NoSQL DB) is better. If you need to handle a lot of data, you will be limited when using MySQL (and other RDBMS).
You can't reuse your MySQL queries nor your data sche...
Input from the keyboard in command line application
I am attempting to get the keyboard input for a command line app for the new Apple programming language Swift.
19 Answers
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How do I load the contents of a text file into a javascript variable?
...a text file in the root of my web app http://localhost/foo.txt and I'd like to load it into a variable in javascript.. in groovy I would do this:
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Finding duplicate values in MySQL
I have a table with a varchar column, and I would like to find all the records that have duplicate values in this column. What is the best query I can use to find the duplicates?
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Make $JAVA_HOME easily changable in Ubuntu [closed]
In Ubuntu, I'd like to switch my JAVA_HOME environment variable back and forth between Java 5 and 6.
8 Answers
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How to perform Unwind segue programmatically?
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1) "File's Owner" -- isn't that old terminology? It worked for me to control drag from the view controller to its Exit icon. 2) Though it ought to be obvious, Xcode is looking for a declaration in the Interface of the IBAction which takes a UIStoryboardSegue argument; the WWDC 20...
Why does Javascript getYear() return 108?
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It's a Y2K thing, only the years since 1900 are counted.
There are potential compatibility issues now that getYear() has been deprecated in favour of getFullYear() - from quirksmode:
To make the matter even more complex, date.getYear...