So, what&#39;s wrong with checking each element iteratively?

    function arraysEqual(arr1, arr2) {
    	if(arr1.length !== arr2.length)
    		return false;
    	for(var i = arr1.length; i--;) {
    		if(arr1[i] !== arr2[i])
    			return false;
    	}
    
    	return true;
    }

You could compare String representations so:

    array1.toString() == array2.toString()
    array1.toString() !== array3.toString()

but that would also make

    array4 = [&#39;1&#39;,2,3,4,5]

equal to array1 if that matters to you

How do I generate cryptographically secure random numbers in javascript?

Secure random numbers in javascript?

I have the activity with several input fields. When activity started soft keyboard is shown. When back button pressed soft keyboard closes and to close activity I need to press back button one more time. 

So the question: is it possible to intercept back button to close soft keyboard and finish activity in one press of back button without creating custom `InputMethodService`?

P.S. I know how to intercept back button in other cases: `onKeyDown()` or `onBackPressed()` but it doesn&#39;t work in this case: only second press of back button is intercepted.

Intercept back button from soft keyboard

I want to check if the two arrays are identical
(not content wise, but in exact order).

For example:

     array1 = [1,2,3,4,5]
     array2 = [1,2,3,4,5]
     array3 = [3,5,1,2,4]

Array 1 and 2 are identical but 3 is not.

Is there a good way to do this in JavaScript?

How to check identical array in most efficient way?

I want to check if the two arrays are identical
(not content wise, but in exact order).
For example:
<pre><code class="hljs language-ini"> array1 = [1,2,3,4,5]
 array2 = [1,2,3,4,5]
 array3 = [3,5,1,2,4]
</code></pre>
Array 1 and 2 are identical but 3 is not.
Is there a good way to do this in JavaScript?

I&#39;m replacing cookies with [localStorage][1] on browsers that can support it (anyone but IE). The problem is *site.com* and **www**.*site.com* store their own separate localStorage objects. I believe www is considered a subdomain (a stupid decision if you ask me). If a user was originally on *site.com* and decides to type in **www**.*site.com* on her next visit, all her personal data will be inaccessible. How do I get all my &quot;subdomains&quot; to share the same localStorage as the main domain?


  [1]: http://www.smashingmagazine.com/2010/10/11/local-storage-and-how-to-use-it/

use localStorage across subdomains

The code is as follows:

    &lt;body&gt;
        &lt;a href=&quot;javascript:;&quot; id=&quot;test&quot;&gt;hello&lt;/a&gt;
    &lt;/body&gt;

    &lt;script type=&quot;text/javascript&quot;&gt;
        document.getElementById(&quot;test&quot;).addEventListener(&quot;click&quot;, function () {
          test()
        }, false)
        function test() {
          var postTypes = new Array(&#39;hello&#39;, &#39;there&#39;)
          (function() { alert(&#39;hello there&#39;) })()
        }
    &lt;/script&gt;

This will throw an:
&gt; &quot;Uncaught TypeError: object is not a function&quot;

If I wrap the anonymous function call/invocation in another set of parentheses it will execute the alert, but still give me an error.  If I put a semicolon after the &quot;var postTypes&quot; definition then it will be completely fine.

I was led to believe that JavaScript does not require semicolons, so I&#39;m making a guess that there is some weird associativity rules of function application that I am not fully understanding. Why am I getting this error?





JavaScript &quot;Uncaught TypeError: object is not a function&quot; associativity question

So for example:

    function(input){
        var testVar = input;
        string = ...
        string.replace(/ReGeX + testVar + ReGeX/, &quot;replacement&quot;)
    }

But this is of course not working :)
Is there any way to do this?

Javascript Regex: How to put a variable inside a regular expression?

How can i get the width and height of the canvas element in JavaScript?

Also, what is the &quot;context&quot; of the canvas I keep reading about?

How do I get the width and height of a HTML5 canvas?

I have the following code in my html:

    &lt;p id=&#39;foo&#39; style=&#39;text-align:center; font-size:14pt; font-family:verdana; color:red&#39;&gt;hello world&lt;/p&gt;

and that in my external css:

    #foo{ font-size:11pt; font-family:arial; color:#000; }

I want to remove all `font-size` and `font-family` in the `style` atribute, but not the `color` and others set in external css.

**Result expected:**

    &lt;p id=&#39;foo&#39; style=&#39;text-align:center; color:red&#39;&gt;hello world&lt;/p&gt;

***Already tried:***

    $(&#39;#foo&#39;).removeAttr(&#39;style&#39;);   // That removes all inline
    $(&#39;#foo&#39;).css(&#39;font-family&#39;,&#39;&#39;); // That remove the css setted too


Remove a specific inline style with Javascript|jQuery

Convert this Array:

    a = [&quot;item 1&quot;, &quot;item 2&quot;, &quot;item 3&quot;, &quot;item 4&quot;] 

...to a Hash: 

    { &quot;item 1&quot; =&gt; &quot;item 2&quot;, &quot;item 3&quot; =&gt; &quot;item 4&quot; }

i.e. elements at *even* indexes are *keys* and *odd* ones are *values*.

Array to Hash Ruby

How might I convert an `ArrayList&lt;String&gt;` object to a `String[]` array in Java?

Converting &#39;ArrayList&lt;String&gt; to &#39;String[]&#39; in Java

I can&#39;t find a definite answer to this question in the documentation. If a column is an array type, will all the entered values be individually indexed?

I created a simple table with one `int[]` column, and put a unique index on it. I noticed that I couldn&#39;t add the same array of ints, which leads me to believe the index is a composite of the array items, not an index of each item.

    INSERT INTO &quot;Test&quot;.&quot;Test&quot; VALUES (&#39;{10, 15, 20}&#39;);
    INSERT INTO &quot;Test&quot;.&quot;Test&quot; VALUES (&#39;{10, 20, 30}&#39;);
    
    SELECT * FROM &quot;Test&quot;.&quot;Test&quot; WHERE 20 = ANY (&quot;Column1&quot;);

Is the index helping this query?

Can PostgreSQL index array columns?

How can I add space character in the ruby array if I want to use %w(a b c) syntax?


Space in the ruby array by %w

How do you pass an associative array as an argument to a function? Is this possible in Bash?

The code below is not working as expected:

    function iterateArray
    {
    	local ADATA=&quot;${@}&quot;            # associative array
    	
    for key in &quot;${!ADATA[@]}&quot;
    do
    	echo &quot;key - ${key}&quot;
    	echo &quot;value: ${ADATA[$key]}&quot;
    
    done
    
    }

Passing associative arrays to a function like normal arrays does not work:
 
    iterateArray &quot;$A_DATA&quot;

or

    iterateArray &quot;$A_DATA[@]&quot;

How to pass an associative array as argument to a function in Bash?

`max(float(&#39;nan&#39;), 1)` evaluates to nan

`max(1, float(&#39;nan&#39;))` evaluates to 1

Is it the intended behavior?


----------
Thanks for the answers.

`max` raises an exception when the iterable is empty. Why wouldn&#39;t Python&#39;s `max` raise an exception when `nan` is present? Or at least do something useful, like return `nan` or ignore `nan`. The current behavior is very unsafe and seems completely unreasonable.

I found an even more surprising consequence of this behavior, so I just posted a [related question][1].


  [1]: https://stackoverflow.com/questions/4240050/python-sort-function-breaks-in-the-presence-of-nan

Python: max/min builtin functions depend on parameter order

I have a class where I want to override the `__eq__` method. It seems to make sense that I should override the `__ne__` method as well. Should I implement `__ne__` as the negation of `__eq__` as such or is it a bad idea?

```python
class A:

    def __init__(self, state):
        self.state = state

    def __eq__(self, other):
        return self.state == other.state

    def __ne__(self, other):
        return not self.__eq__(other)
```

Should __ne__ be implemented as the negation of __eq__?

I know that below are the two ways in JavaScript to check whether a variable is not `null`, but I’m confused which is the best practice to use.

Should I do:

    if (myVar) {...}

or

    if (myVar !== null) {...}



How to check if a variable is not null?

I have two variables of type int? (or Nullable&amp;lt;int&amp;gt; if you will). I wanted to do a greater-than-or-equal (&gt;=) comparison on the two variables but as it turns out, this returns false if both variables are null, while obviously the == operator returns true.

Can someone explain to me why that is logical because the semantical definition of the &gt;= operator contains the word &quot;or&quot;?


Why does &gt;= return false when == returns true for null values?

I used to build Ruby on Rails apps with MySQL.

MongoDB currently become more and more famous and I am now starting to give it a try.

The problem is, I don&#39;t know the underlying theory of how MongoDB is working (am using mongoid gem if it matter)

So I would like to have a comparison on the performance between using MySQL+ActiveRecord and model generated by mongoid gem, could anyone help me to figure it out?

Content Type	Original Author	Original Content on Stackoverflow
Question	ssdesign	View Question on Stackoverflow
Solution 1 - Javascript	palswim	View Answer on Stackoverflow
Solution 2 - Javascript	Adam	View Answer on Stackoverflow

How to check identical array in most efficient way?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Intercept back button from soft keyboard

Secure random numbers in javascript?

Attributions