To change **how fast a key repeats when holding it down**, adjust this setting:

&quot;System Preferences&quot; -&gt; &quot;Keyboard&quot; -&gt; &quot;Keyboard Tab&quot; -&gt; &quot;Keyboard Repeat&quot;



To change **how long you have to hold it down before it registers as repeating**, adjust this setting:

&quot;System Preferences&quot; -&gt; &quot;Keyboard&quot; -&gt; &quot;Keyboard Tab&quot; -&gt; &quot;Delay Until Repeat&quot;

I have `0,4*A1` in a cell (as a string). How can convert this &quot;string formula&quot; into a real formula and calculate its value, in another cell?

How to turn a string formula into a &quot;real&quot; formula?

I am getting an array after some manipulation. I need to convert all array values as integers.

**My sample code**

    var result_string = &#39;a,b,c,d|1,2,3,4&#39;;
    result = result_string.split(&quot;|&quot;);
    alpha = result[0];
    count = result[1];
    // console.log(alpha);
    // console.log(count);
    count_array = count.split(&quot;,&quot;);

`count_array` now contains `1,2,3,4` but I need these value to be in integers.

I had used `parseInt(count_array);`, but it fails. JS considers each value in this array as string.

How to convert all elements in an array to integer in JavaScript?

Is it just me, or do other people find that the left and right arrow keys on MacOS are unusually slow for editing text? 

Compared to my Windows machines, positioning the cursor with left/right arrow keys seems to take twice as long on the Mac. The up/down arrows seem to be speedy enough, but left/right arrows just crawl. I notice it the most in Terminal, editing recently used commands, and I&#39;m noticing it right now while text in a browser form.

Is there a Mac preference I can set to speed up the response to these keys?

How to speed up the left and right arrow keys for editing text?

Is it just me, or do other people find that the left and right arrow keys on MacOS are unusually slow for editing text?
Compared to my Windows machines, positioning the cursor with left/right arrow keys seems to take twice as long on the Mac. The up/down arrows seem to be speedy enough, but left/right arrows just crawl. I notice it the most in Terminal, editing recently used commands, and I'm noticing it right now while text in a browser form.
Is there a Mac preference I can set to speed up the response to these keys?

Need suggestion on tools similar to kcachegrind wingrind valgrind for mac platform. 

I don&#39;t think these work on mac, I already checked these.

Need kcachegrind like profiling tools for mac

Is there any way to get the SSID of the current wireless network through a shell script on Mac OS X?

Get wireless SSID through shell script on Mac OS X

I am using IntelliJ IDEA 10. Every time when I create a new project, it is asking me to choose JDK for this project. Anyone know how I can configure it and make it easy to use?

IntelliJ IDEA JDK configuration on Mac OS

How can I increase the cursor speed in terminal?
I have Mac OS X by the way.
It would also be interesting to know it for Linux.

I don&#39;t know what I should search for in Google (or what you like).


How can I increase the cursor speed in terminal?

So I&#39;ve been trying to get dynamic libraries to work in my XCode project under Mac OS X. So far no joy.

I am able to load the dylib file, but when I call dlsym to get the function pointer, it returns 0 and dlerror says symbol not found.

So I am wondering if there is a simple way to list the symbols that are exported from a dylib file. Any ideas would be great.

How to print a list of symbols exported from a dynamic library

How do I go about creating a custom keyboard/keypad that will show up when some one taps on a UITextField?  I would like to display a keypad with a, b, c, 1, 2, 3 and an enter button, nothing else.  The keypad should work and behave like the standard keyboard does (in behavior) but it will definitely look different.

I can&#39;t find any example and the best I&#39;ve found is to filter characters with existing keyboard which is an unacceptable solution.


How to create a custom keyboard

I got a relative simple question. I have an activity with a lot of EditText&#39;s in them. When I open the activity it automatically focusses to the first EditText and displays the virtual keyboard.

How can I prevent this?

Automatic popping up keyboard on start Activity

Is there a way in Android to detect if the software (a.k.a. &quot;soft&quot;) keyboard is visible on screen?

How do I detect if software keyboard is visible on Android Device or not?

I&#39;m working on a typing-tutor application for Mac OS X that needs to have keystrokes forwarded to it, even when the application is not in focus.

Is there a way to have the system forward keystrokes to the app, possibly through NSDistributedNotificationCenter? I&#39;ve googled myself silly, and haven&#39;t been able to find an answer...

**EDIT:** _Sample code below_.

Thanks @NSGod for pointing me in the right direction -- I ended up adding a [global events monitor](https://developer.apple.com/documentation/appkit/nsevent/1535472-addglobalmonitorforeventsmatchin) using the method `addGlobalMonitorForEventsMatchingMask:handler:`, which works beautifully. For completeness, my implementation looks like this:


    // register for keys throughout the device...
    [NSEvent addGlobalMonitorForEventsMatchingMask:NSKeyDownMask
                                           handler:^(NSEvent *event){
        
        NSString *chars = [[event characters] lowercaseString];
        unichar character = [chars characterAtIndex:0];
        
        NSLog(@&quot;keydown globally! Which key? This key: %c&quot;, character);
        
    }];

For me, the tricky part was using blocks, so I&#39;ll give a little description in case it helps anyone:

The thing to notice about the above code is that it&#39;s all **one single method call** on NSEvent. The block is supplied as an argument, directly **to** the function. You could think of it kind of like an inline delegate method. Just because this took a while to sink in for me, I&#39;m going to work through it step by step here:

    [NSEvent addGlobalMonitorForEventsMatchingMask:NSKeyDownMask

This first bit is no problem. You&#39;re calling a class method on NSEvent, and telling it which event you&#39;re looking to monitor, in this case NSKeyDownMask. A [list of masks for supported event types](http://developer.apple.com/library/mac/#DOCUMENTATION/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html%23//apple_ref/occ/clm/NSEvent/addGlobalMonitorForEventsMatchingMask:handler:) can be found [here](http://developer.apple.com/library/mac/#DOCUMENTATION/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html%23//apple_ref/occ/clm/NSEvent/addGlobalMonitorForEventsMatchingMask:handler:).

Now, we come to the tricky part: handler, which expects a block:

    handler:^(NSEvent *event){

It took me a few compile errors to get this right, but (thank you Apple) they were very constructive error messages. The first thing to notice is the carat ^. That signals the start of the block. After that, within the parentheses, 

    NSEvent *event

Which declares the variable that you&#39;ll be using within the block to capture the event. You could call it 

    NSEvent *someCustomNameForAnEvent

doesn&#39;t matter, you&#39;ll just be using that name within the block. Then, that&#39;s just about all there is to it. Make sure to close your curly brace, and bracket to finish the method call:

    }];

And you&#39;re done! This really is kind of a &#39;one-liner&#39;. It doesn&#39;t matter where you execute this call within your app -- I do it in the AppDelegate&#39;s applicationDidFinishLaunching method. Then, within the block, you can call other methods from within your app.


OS X: Detect system-wide keyDown events?

I want to automatically show the soft-keyboard when an `EditText` is focused (if the device does not have a physical keyboard) and I have two problems:

 1. When my `Activity` is displayed, my `EditText` is focused but the keyboard is not displayed, I need to click again on it to show the keyboard (it should be displayed when my `Activity` is displayed).

 2. And when I click done on the keyboard, the keyboard is dissmissed but the `EditText` stays focused and y don&#39;t want (because my edit is done).

To resume, my problem is to have something more like on the iPhone: which keep the keyboard sync with my `EditText` state (focused / not focused) and of course does not present a soft-keyboard if there is a physical one.

How to show soft-keyboard when edittext is focused

I have this simple HTML as an example:

    &lt;div id=&quot;editable&quot; contenteditable=&quot;true&quot;&gt;
      text text text&lt;br&gt;
      text text text&lt;br&gt;
      text text text&lt;br&gt;
    &lt;/div&gt;
    &lt;button id=&quot;button&quot;&gt;focus&lt;/button&gt;

I want simple thing - when I click the button, I want to place caret(cursor) into specific place in the editable div. From searching over the web, I have this JS attached to button click, but it doesn&#39;t work (FF, Chrome):

    var range = document.createRange();
    var myDiv = document.getElementById(&quot;editable&quot;);
    range.setStart(myDiv, 5);
    range.setEnd(myDiv, 5);

Is it possible to set manually caret position like this ?

How to set the caret (cursor) position in a contenteditable element (div)?

I have a text box with a displayed string already in it.
To bring the cursor to the textbox I am already doing

    txtbox.Focus();

But how do I get the cursor at the end of the string in the textbox ?

Setting cursor at the end of any text of a textbox

I&#39;m making a game using canvas, and javascript.

When the page is longer than the screen (comments, etc.) pressing the down arrow scrolls the page down, and makes the game impossible to play.

What can I do to prevent the window from scrolling when the player just wants to move down?

I guess with Java games, and such, this is not a problem, as long as the user clicks on the game. 

I tried the solution from: https://stackoverflow.com/questions/2020414/how-to-disable-page-scrolling-in-ff-with-arrow-keys ,but I couldn&#39;t get it to work.

Disable arrow key scrolling in users browser

Has anyone else ever had this error in PuTTy?

For example, pressing the Up Key now produces:

    &gt;&gt;&gt; ^[[A


Google doesn&#39;t let you search for special characters so I&#39;m stumped at finding existing version of this problem. 

--------------

EDIT:

So this happened after I pasted in some unicode (when, I think, the translation was already set to utf-8). 

I&#39;ve checked the Change Settings dialog box for different settings than my other open PuTTy windows, but the settings appear to be identical. 


EDIT2:

This is fixed by restarting PuTTy, but still a nuisance. 


**EDIT3:**

**How to replicate the exact same bug:**

 1. Open a putty terminal to a linux PC (I&#39;m using RedHat)
 2. Open Python 2.7.*  - using the command `python2.7` (note: error does not appear in 2.6)
 3. `import codecs`
 4. Now use the arrow keys, and these bizarre characters appear. 

Arrow keys in Putty returning ^[[A ^[[D ^[[B instead of moving the cursor

Scenario in short: A table with more than 16 million records [2GB in size]. The higher LIMIT offset with SELECT, the slower the query becomes, when using     ORDER BY *primary_key*

So  

    SELECT * FROM large ORDER BY `id`  LIMIT 0, 30 

takes far less than  

    SELECT * FROM large ORDER BY `id` LIMIT 10000, 30 

That only orders 30 records and same eitherway. So it&#39;s not the overhead from ORDER BY.  
Now when fetching the latest 30 rows it takes around 180 seconds. How can I optimize that simple query?


Why does MYSQL higher LIMIT offset slow the query down?

I have a Python program that spawns many threads, runs 4 at a time, and each performs an expensive operation. Pseudocode:

    for object in list:
        t = Thread(target=process, args=(object))
        # if fewer than 4 threads are currently running, t.start(). Otherwise, add t to queue

But when the program is run, Activity Monitor in OS X shows that 1 of the 4 logical cores is at 100% and the others are at nearly 0. Obviously I can&#39;t force the OS to do anything but I&#39;ve never had to pay attention to performance in multi-threaded code like this before so I was wondering if I&#39;m just missing or misunderstanding something.

Thanks.


Python threads all executing on a single core

I have been experimenting with Redis and MongoDB lately and it would seem that there are often cases where you would store an array of __id&#39;s__ in either MongoDB or Redis. I&#39;ll stick with Redis for this question since I am asking about the MySQL __IN__ operator.

I was wondering how performant it is to list a large number (300-3000) of __id&#39;s__ inside the IN operator, which would look something like this:

    SELECT id, name, price
    FROM products
    WHERE id IN (1, 2, 3, 4, ...... 3000)

Imagine something as simple as a __products__ and __categories__ table which you might normally JOIN together to get the __products__ from a certain __category__. In the example above you can see that under a given category in Redis ( `category:4:product_ids` ) I return all the product ids from the category with id 4, and place them in the above `SELECT` query inside the `IN` operator.

How performant is this?

Is this an &quot;it depends&quot; situation? Or is there a concrete &quot;this is (un)acceptable&quot; or &quot;fast&quot; or &quot;slow&quot; or should I add a `LIMIT 25`, or doesn&#39;t that help?

    SELECT id, name, price
    FROM products
    WHERE id IN (1, 2, 3, 4, ...... 3000)
    LIMIT 25

Or should I trim the array of product id&#39;s returned by Redis to limit it to 25 and only add 25 id&#39;s to the query rather than 3000 and `LIMIT`-ing it to 25 from inside the query? 

    SELECT id, name, price
    FROM products
    WHERE id IN (1, 2, 3, 4, ...... 25)

Any suggestions/feedback is much appreciated!

MySQL &quot;IN&quot; operator performance on (large?) number of values

It is supposed to be generally preferable to use a `StringBuilder` for string concatenation in Java. Is this always the case?

What I mean is this: Is the overhead of creating a `StringBuilder` object, calling the `append()` method and finally `toString()` already smaller then concatenating existing strings with the `+` operator for two strings, or is it only advisable for more (than two) strings?

If there is such a threshold, what does it depend on (perhaps the string length, but in which way)?

And finally, would you trade the readability and conciseness of the `+` concatenation for the performance of the `StringBuilder` in smaller cases like two, three or four strings?

Explicit use of `StringBuilder` for regular concatenations is being mentioned as obsolete at [obsolete Java optimization tips][1] as well as at [Java urban myths][2].

  [1]: https://stackoverflow.com/questions/4019180/obsolete-java-optimization-tips
  [2]: https://stackoverflow.com/questions/2248278/java-urban-myths


When to use StringBuilder in Java

I have noticed while monitoring/attempting to answer common jQuery questions, that there are certain practices using javascript, instead of jQuery, that actually enable you to *write less and do* ... well the same amount.  And may also yield performance benefits.

A specific example 

`$(this)` vs `this`

Inside a click event referencing the clicked objects id

jQuery

    $(this).attr(&quot;id&quot;);

Javascript

    this.id;

Are there any other common practices like this?  Where certain Javascript operations could be accomplished easier, without bringing jQuery into the mix.  Or is this a rare case? (of a jQuery &quot;shortcut&quot; actually requiring more code)

**EDIT :** While I appreciate the answers regarding jQuery vs. plain javascript performance, I am actually looking for much more quantitative answers.  **While using jQuery**, instances where one would actually be better off (readability/compactness) to use plain javascript instead of using `$()`.  In addition to the example I gave in my original question.

Content Type	Original Author	Original Content on Stackoverflow
Question	Blue	View Question on Stackoverflow
Solution 1 - Macos	Vadim	View Answer on Stackoverflow

How to speed up the left and right arrow keys for editing text?

Macos Problem Overview

Macos Solutions

Solution 1 - Macos

How to convert all elements in an array to integer in JavaScript?

How to turn a string formula into a "real" formula?

Attributions