Finding specific objects in array to remove [duplicate]

Question

I have an array of data which stores an object with functions and other such info. I push these objects to the function for my draw function to execute.

But i do not know of a way to find a specific object in an array to remove it and thus stop drawing it.

For example i have an array structure like this:

var data  = {
            'fnc':function(){ 
                      updatePosition(spriteID); 
                      drawSprite(spriteID); 
             },
             'something':'here'
            };

var drawOrder= [];
drawOrder.push(data);

There are many functions in this array and they are pushed dynamically depending on what i wish to draw.

What would be the best way to find the index of one of these objects and remove it from the array in this case?

You want to find an object in your array by its type property? — Daniel Lizik
– Daniel Lizik, Commented Jan 9, 2016 at 4:23
No, the entire object as a whole not just type. That type` is related to my draw function. Edited the code to avoid the confusion :) — Sir
– Sir, Commented Jan 9, 2016 at 4:24
why drawOrder.indexOf(objYouPush) will not work in your case? — Stefano Saitta
– Stefano Saitta, Commented Jan 9, 2016 at 4:24
Sorry I don't understand your quesion. If you want the best way to find the index, just do drawOrder[n].fnc() — Daniel Lizik
– Daniel Lizik, Commented Jan 9, 2016 at 4:26
@Daniel_L but n implies i already know the index in which case i can just splice it. — Sir
– Sir, Commented Jan 9, 2016 at 4:26

Magical Gordon · Accepted Answer · 2016-01-09 04:30:57Z

1

indexOf() returns the index in the array of the element you're searching for, or -1. So you can do:

var index = drawOrder.indexOf("aKey");
if (index != -1)
    drawOrder.splice(index, 1);

Splice:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
indexOf:
http://www.w3schools.com/jsref/jsref_indexof_array.asp

edited Jan 9, 2016 at 4:30

answered Jan 9, 2016 at 4:24

Magical Gordon

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Comments

Stefano Saitta · Accepted Answer · 2016-01-09 04:31:12Z

I'm not 100% this will answer your question cause is not clear at least to me.

If you want to remove the whole element but you are worried about founding the right index before actually splice the array you should use Array.indexOF

See this code below:

var data  = {
            'fnc':function(){ 
                      updatePosition(spriteID); 
                      drawSprite(spriteID); 
             },
             'type':'aabb'
            };

var drawOrder= [];
drawOrder.push(data);
console.log(drawOrder);
drawOrder.splice(drawOrder.indexOf(data), 1);
console.log(drawOrder);

As the documentation reports:

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

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