

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    var test = {&#39;red&#39;:&#39;#FF0000&#39;, &#39;blue&#39;:&#39;#0000FF&#39;};
    delete test.blue; // or use =&gt; delete test[&#39;blue&#39;];
    console.log(test);

&lt;!-- end snippet --&gt;

this deletes test.blue


I have a background image in the following div, but the image gets cut off:

     &lt;div style=&#39;text-align:center;background-image: url(/media/img_1_bg.jpg);background-repeat:no-repeat;width:450px;height:900px;&#39; id=&quot;mainpage&quot; align=&quot;center&quot;&gt;

Is there a way to show the background image without cutting it off?

Fit background image to div

I have a set of data which looks something like this:

    anim &lt;- c(25499,25500,25501,25502,25503,25504)
    sex  &lt;- c(1,2,2,1,2,1)
    wt   &lt;- c(0.8,1.2,1.0,2.0,1.8,1.4)
    data &lt;- data.frame(anim,sex,wt)

    data
       anim sex  wt anim2
    1 25499   1 0.8     2
    2 25500   2 1.2     2
    3 25501   2 1.0     2
    4 25502   1 2.0     2
    5 25503   2 1.8     2
    6 25504   1 1.4     2

I would like a zero to be added before each animal id:

    data
       anim sex  wt anim2
    1 025499   1 0.8     2
    2 025500   2 1.2     2
    3 025501   2 1.0     2
    4 025502   1 2.0     2
    5 025503   2 1.8     2
    6 025504   1 1.4     2

And for interest sake, what if I need to add two or three zeros before the animal id&#39;s?


How to add leading zeros?

How can I remove an item from a JavaScript object?

Like this:

    var test = {&#39;red&#39;:&#39;#FF0000&#39;, &#39;blue&#39;:&#39;#0000FF&#39;};
    test.remove(&#39;blue&#39;);

How to remove item from a JavaScript object

How can I remove an item from a JavaScript object?
Like this:
<pre><code class="hljs language-ini">var test = {'red':'#FF0000', 'blue':'#0000FF'};
test.remove('blue');
</code></pre>

I have an &#39;Open&#39; button that &#39;calculates&#39; a link that should be opened in a new tab.
I try to use:

    window.open(url, &#39;_blank&#39;);

But that opens a new window.

I also tried the following method:

    &lt;form id=&quot;oform&quot; name=&quot;oform&quot; action=&quot;&quot; method=&quot;post&quot; target=&quot;_blank&quot;&gt;
    &lt;/form&gt;
    
    ...
    
    document.getElementById(&quot;oform&quot;).action = url;
    document.getElementById(&quot;oform&quot;).submit();

Still, a new window is opened, instead of a new tab.

When using simple `&lt;a href...&gt;` with `target=&#39;blank&#39;`, the link is opened in a new tab.

Is there a solution?

How can I open a link in new tab (and not new window)?

I want to create a map object in javascript. I came to the following idea:

     var a = new Array();
     a[&quot;key1&quot;] = &quot;value1&quot;;
     a[&quot;key2&quot;] = &quot;value2&quot;;

but then how I can find if a particular key exists or not?


How to create a hash or dictionary object in JavaScript

What is the regular expression (in JavaScript if it matters) to only match if the text is an exact match? That is, there should be no extra characters at other end of the string.

For example, if I&#39;m trying to match for `abc`, then `1abc1`, `1abc`, and `abc1` would not match.

Match exact string

What would be the tersest way to create this array:

    var x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    	     11, 12, 13, 14, 15, 16, 17, 18, 19, 20];

For example, a `for` loop:

    var x = [];
    for (var i=1;i&lt;=20;i++) {
      x.push(i);
    }

Or a `while` loop:

    var x = [], i = 1, endInt = 20;
    while (i &lt;= endInt) {
      x.push(i);
      i++;
    }

Would there be other examples that would be terser -- in other words -- less code? I&#39;m thinking of things like in Ruby where the equivalent code I believe would be as simple as `1..20`. I&#39;m not aware of syntax like that in JavaScript but I&#39;m wondering if there are shorter ways to do that same thing.

**UPDATE:** I wasn&#39;t thinking of removing semicolons or `var` for answers in the question, but I have to admit the question implies that. I am more curious about algorithms than shaving bytes. Sorry if I was unclear! Also, making it into a function is simple enough, just slap `function range(start, end) { /* guts here */ }` around it and you&#39;re there. The question is are there novel approaches to the &quot;guts.&quot;  

Tersest way to create an array of integers from 1..20 in JavaScript

I want to have a button which selects the text in a `textarea` and copies it to the clipboard.  I can&#39;t seem to find any solutions which work in all browsers and don&#39;t use flash.

Surely this is doable?  I&#39;ve seen it all over the place but I guess they use flash, which I really want to stay away from if possible as some people don&#39;t have it.

This is what I have so far - it just selects the text:

    function copyCode() {
      $(&quot;#output-code&quot;).focus();
      $(&quot;#output-code&quot;).select();
    }

(The focus is not strictly necessary)

Copy selected text to the clipboard WITHOUT using flash - must be cross-browser

As we know, creating anonymous objects in JavaScript is easy, like the code below:

    var object = { 
        p : &quot;value&quot;, 
        p1 : [ &quot;john&quot;, &quot;johnny&quot; ]
    };

    alert(object.p1[1]);

Output:

    an alert is raised with value &quot;johnny&quot;

Can this same technique be applied in PHP? Can we create anonymous objects in PHP?

Creating anonymous objects in php

I have an array of objects. I know that objects get assigned by &quot;reference&quot; and arrays by &quot;value&quot;. But when I assign the array, each element of the array is referencing the object, so when I modify an object in either array the changes are reflected in the other.

Is there a simple way to clone an array, or must I loop through it to clone each object?

How to clone an array of objects in PHP?

It&#39;s difficult to explain the case by words, let me give an example:

    var myObj = {
        &#39;name&#39;: &#39;Umut&#39;,
        &#39;age&#39; : 34
    };

    var prop = &#39;name&#39;;
    var value = &#39;Onur&#39;;

    myObj[name] = value; // This does not work

    eval(&#39;myObj.&#39; + name) = value;   //Bad coding ;)

How can I set a variable property with variable value in a JavaScript object?

How to set a Javascript object values dynamically?

I need some help with this:

Example:

    void method1{
        MyObject obj1=new MyObject();
        obj1.method1();
    }

I want to mock `obj1.method1()` in my test but to be transparent so I don&#39;t want make and change of code.
Is there any way to do this in Mockito?

Mocking methods of local scope objects with Mockito

`X` is a 2D array. I want to have a new variable `Y` that which has the same value as the array `X`. Moreover, **any further manipulations with Y should not influence the value of the X.** 

It seems to me so natural to use `y = x`. But it does not work with arrays. If I do it this way and then changes y, the x will be changed too. I found out that the problem can be solved like that: `y = x[:]`

But it does not work with 2D array. For example:

    x = [[1,2],[3,4]]
    y = x[:]
    y[0][0]= 1000
    print x

returns `[ [1000, 2], [3, 4] ]`. It also does not help if I replace `y=x[:]` by `y = x[:][:]`.

Does anybody know what is a proper and simple way to do it?

    




Content Type	Original Author	Original Content on Stackoverflow
Question	ezebemmel	View Question on Stackoverflow
Solution 1 - Javascript	matchew	View Answer on Stackoverflow

How to remove item from a JavaScript object

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

How to add leading zeros?

Fit background image to div

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