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How can I make sure Javascript array containing values with certain character remain unaltered, while I work on it?

Suppose I have an Javascript array,
var example = [and, there,sharma<br, />, ok, grt]
Now I want to randomly delete some array values - but not those values which have
<br
in them, in the above example, I want to make sure
"sharma<br" is not deleted.
I also do not want to delete "/>".
Can anyone help me. I would really appreciate the answer.

First of all, that is not a valid array, unless you are missing the string quotes. Anyway, what you are searching for is Array.Filter. In your case :
var filtered = example.filter(v => v.indexOf("<br") != -1 || v.indexOf("/>") != -1)

If I have understood the problem correctly, then you want to keep those entries in the array which have substrings "<br" and "/>"
If thats the case, you can try using javascript string method includes() to see if a string contains a particular substring.

JavaScript array must be created as below
var example = ["and"," there"",sharma<br","/>","ok"," grt"];
Using splice method , to delete the array values specifying the index positions.
array splice() method changes the content of an array, adding new elements while removing old elements.
Syntax
Its syntax is as follows −
array.splice(index, howMany, [element1][, ..., elementN]);
Parameter Details
index −
Index at which to start changing the array.
howMany −
An integer indicating the number of old array elements to remove. If howMany is 0, no elements are removed.
element1, ..., elementN −
The elements to add to the array. If you don't specify any elements, splice simply removes the elements from the array.
Return Value
Returns the extracted array based on the passed parameters.
var removed = arr.splice(2, 2);
This would remove your suggested output to be my assumption .

How to get the element before last?

In Protractor, there is the .first() and .last() methods available on ElementArrayFinder:
var elements = element.all(by.css(".myclass"));
elements.last();
elements.first();
But, how to get the element just before the last one (penultimate) without knowing how many elements are there in total?

You can use negative indexing to get the elements from the end by index:
Negative indices are wrapped (i.e. -i means ith element from last)
elements.get(-2); // the element before last

Remove element from jQuery object

I have a jQuery object that is created via jQuery .find() as seen below...
var $mytable= $('#mytable');
var $myObject = $mytable.find("tbody tr");
This works great and creates a jQuery object of all the tr elements in the tbody. However, as I'm looping over the data, I need to be able to remove parts of the object as I go. For instance, if the above call returns a jQuery object named $myObject with a length of 10, and I want to remove the index 10, I thought I could just do $myObject.splice(10,1) and it would remove the element at index 10. However this doesn't seem to be working.
Any ideas why? Thank you!
UPDATE
I basically just want to be able to remove any element I want from $myObject as I loop through the data. I know it's zero based (bad example above I guess), was just trying to get my point across.
UPDATE
Okay, so I create the object using the find method on the table and at it's creation it's length is 24. As I loop over the object, when I hit an element I don't want I tried to use Array.prototype.splice.call($rows,x,1) where x represents the index to remove. Afterwards when I view the object in the console, it still has a length of 24.

Use .not() to remove a single element, then loop through the jQuery object at your leisure:
var $myObject = $mytable.find('tbody tr').not(':eq(9)'); // zero-based
http://jsfiddle.net/mblase75/tLP87/
http://api.jquery.com/not/
Or if you might be removing more than one:
var $myObject = $mytable.find("tbody tr:lt(9)");
http://jsfiddle.net/mblase75/9evT8/
http://api.jquery.com/lt-selector/

splice is not part of the jQuery API, but you can apply native Array methods on jQuery collections by applying the prototype:
Array.prototype.splice.call($myObject, 9, 1); // 0-index
You can also use pop to remove the last item:
Array.prototype.pop.call($myObject);
This should also give you a correct length property.

splice is an array method, not a jQuery object method.
Try slice

Javascript uses zero-based arrays. This means that the final item in the array (i.e. the 10th item) will be at index 9.
$myObject[9]
So you need something like this:
$myObject.splice(9, 1);
This will remove the element from your existing array, and also return it.

You could also use filter :
var $myObject = $mytable.find("tbody tr").filter(':lt(9)');

You can use .remove to remove an element from the DOM.
So to remove the element at index 9 of the $myObject array, use:
$myObject.eq(9).remove();
If you want to keep the element that you are removing, you can also do:
var removedElement = $myObject.eq(9);
removedElement.detach();

JS Slice only removes Items when they were in the Constructor

I try to remove the first Item so that all other move up in an Array I create with
..
Queue: [],
..
and dynamically push Items into.
I later use slice to remove them and have then next Item be the first one.
..
thread.Queue.slice(0, 1);
..
It should return the first Item of the Array, which it does, but it should also remove it from the array and move all other up.
Here is a example which shows, that is neither working in the Browser. (I found this 'behaviour' in Node.js)
http://jsfiddle.net/bTrsE/
or rather
http://gyazo.com/b3dcdbf4f74642c04fe1c1025f225a08.png

Array.Slice = Is an implementation of SubArray, From an array you want to extract certain elements from the index and return a new array.
Example:
var cars = ['Nissan','Honda','Toyota'];
var bestCars = cars.splice(0,1);
console.log(bestCars);
//This should output Nissan Because i like Nissan
For your problem you should be looking Array.Splice(), splice adds / removes an element from the index
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

The .slice() method does not alter the original array. It returns a shallow copy of the portion of the array you asked for.

Javascript delete than splice

I am working on javascript project where I have 2 arrays 1. elements 2. elementsOrder ; elementsOrder array contains the names of each element, and elements array contains all properties of each element. When I want to delete one element from each array I do it with "delete" build in function, but it doesn't deletes element only sets it to Undefined, so than I use splice method to push out those undefined elements, but it doesn't work.
the is the source:
var s1 = elementsOrder.indexOf(id);
delete elements[s1];
delete elementsOrder[s1];
it does the job and sets elements one by one "undefined" smoothly, but when I do:
var s1 = elementsOrder.indexOf(id);
delete elements[s1];
delete elementsOrder[s1];
elements.splice(s1, 1);
elementsOrder.splice(s1, 1);
using simply splice methods don't work:
var s1 = elementsOrder.indexOf(id);
elements.splice(s1, 1);
elementsOrder.splice(s1, 1);
I use this piece of code in my Javascript Canvas project to animate some canvas objects, so I can easily see when "delete" works smoothly and "undefines" elements one by one, and splice doesn't works so smoothly and doesn't puts out elements one by one
Please see http://jsfiddle.net/7ZuuZ/ pay atantion to function animate, third function from bottom

Why not just splice in the first place?
var s1 = elementsOrder.indexOf(id);
elements.splice(s1,1);
elementsOrder.splice(s1,1);
There is no need to delete here.