empty « Array « Javascript Data Type Q&A

1. Remove empty elements from an array in Javascript    stackoverflow.com

How do I remove empty elements from an array in Javascript? Is there a straightforward way, or do I need to loop through it and remove them manually? Thanks

2. how to empty an array in JavaScript    stackoverflow.com

if there is an array, is it possible to empty with .remove() for instance if

A = [1,2,3,4];

3. Does JavaScript populate empty array items?    stackoverflow.com

I am coding a lot of annual data in JavaScript, and I was considering adding it to arrays, using the year as the array index and putting the data into the ...

4. How do I check if a (javascript) array value is empty or null    stackoverflow.com

Will this work for testing whether a value at position "index" exists or not, or is there a better way:

if(arrayName[index]==""){
     // do stuff
}

5. Why an empty Array type-converts to zero? +[]    stackoverflow.com

just when I thought I understood something about type conversion in JavaScript, I stumbled with this:

+[]; // 0
Number([]); // 0

6. How to empty an javascript array?    stackoverflow.com

var arr = [-3, -34, 1, 32, -100];

arr = [];

7. Conflicting boolean values of an empty JavaScript array    stackoverflow.com

Can anyone explain why the following two statements both evaluate as true?

[] == false

!![]

8. javascript JSON.parse result problem on empty array with localStorage    stackoverflow.com

I initialized a localStorage variable with the following function:

    if (!localStorage["store"]) {
       var aaa = new Array();
      ...

9. javascript empty array seems to be true and false at the same time    stackoverflow.com

Empty arrays are true but they're also equal to false.

var arr = [];
console.log('Array:', arr);
if (arr) console.log("It's true!");
if (arr == false) console.log("It's false!");
if (arr && arr == false) console.log("...what??");

Array: []
It's true!
It's false!
...what??

10. Javascript returning empty array (which shoudn't) on IE    stackoverflow.com

I've written some code to display my bookmarks on IE8. The code works fine except the array of favorites I should have ("favs") as output exists but is empty (when I ...

11. Why does my array appear empty when calling a function after the array is built in JS    stackoverflow.com

// variables to be used throughout
var videos = new Array();

// similar artist/bands
function similarTo(who) {
    $.getJSON('http://ws.audioscrobbler.com/2.0/?method=artist.getsimilar&artist='+who+'&limit=20&api_key=b25b959554ed76058ac220b7b2e0a026&format=json&callback=?', function(data) {
        $.each(data , function(i,similars) {
 ...

12. count empty values in array    stackoverflow.com

Given an array:

var arr = [1,,2,5,6,,4,5,6,,];

var empties = arr.length - arr.filter(function(x){ return true }).length;

// return 3

13. Hiding flot graph labels if the data array is empty    stackoverflow.com

Is there a way to hide a label on a flot graph based on whether or not the array of data is empty? Thanks, W

14. best way to generate empty 2D array    stackoverflow.com

is there a shorter, better way to generate 'n' length 2D array?

var a = (function(){ var i=9, arr=[]; while(i--) arr.push([]); return arr })();

a // [ [],[],[],[],[],[],[],[],[] ]

15. Extending the logical OR || syntax for the empty array    stackoverflow.com

Let f and g be two function. Then f() || g() first evaluates f. If the return value of f is falsy it then evaluates g, and returns g's return value. I ...

16. push empty array as value of an array key    stackoverflow.com

I need to push a new array as the value of a parent array key. this is my array.

asd[
[hey],
[hi]

]

asd[
[hey]=>[],
[hi]
]

var asd = new Array();
asd.push(hey);
asd.push(hi);
asd[hey].push(new Array());

so obviously is not ...

17. Empty array after adding elements using Titanium Appcelerator mobile 1.7.2    stackoverflow.com

I'm using Titanium Appcelerator mobile API 1.7.2. When creating an array, I'm getting some odd results. Is it my syntax?

container.textBoxArray = new Array();
container.textBoxArray[0] = createPasswordTextField(options, '0%');
container.textBoxArray[1] = createPasswordTextField(options, '25%');
Ti.API.log(container.textBoxArray == null);
Ti.API.log('len: ' ...

18. Javascript - Array emptying value at close of function    stackoverflow.com

I have a function which calculates a total quote for an order, which then alerts the output to the user. I also want the total quote to be stored in an ...

19. Why does this array show as empty with a length of 0?    forums.digitalpoint.com

Hi. I have this weird situation. It might be my lack of understanding of the JS language. I have an object with a private member named nodeData. nodeData is an array of YUI HtmlNodes that are used with the TreeView widget(I'm writing some wrapper code around YUI TreeView). Nodes get inserted and retrieved, but when I return the entire array with ...

20. Empty array    forums.devshed.com

21. JSON array is empty    sitepoint.com

i think the stringifier function will encode the string to the correct JSON format and that is what i used it for. i have seen threads that encoding and decoding in the correct JSON format is tricky and i saw it here the easier way is to do this I tried using the code from http://www.factsandpeople.com/facts-...x-json-and-php but it seems like the ...

22. how do I keep the arrays from showing up, if empty?    sitepoint.com

how do I keep the arrays from showing up, if empty? thanks for the help earlier. I simplified the code so each description is in an array. however, sometimes the arrays will not have any description, and i need those ones not to show up. How would I stop the blank arrays from showing up? for instance if tickercontents[3] is null,i ...