Need array creation and popping from the middle advice

[OM2]

I want to create an array of 1 - X

(X could be 10, 20, 30 or any number)

 

Then I want to randomly choose a number from 1 - X

 

I now want to remove the random choice - and then do the same again twice

 

Question 1: How do I create the array in the first place?

 

Answer: var x=[0,1,2,3,4,5,6,7,8,9,10];

 

I'd much prefer it if I could do something like this:

 

var x=[0...10];

 

This would create the same, except, I don't have to type out all the numbers! And if I needed to increase the number in the array, I could simply just change the last number

 

I've just made the syntax up 

I was hoping something similar shorthand existed

Or do I have to do this by creating a loop?

 

Question 2: how do I pop an item from the middle or somewhere other than the beginning or end?

 

I've googled and all I can find is how to remove the first and last items!

 

The way I see it:

 

- Get a solution for popping from the middle of an array

I'm sure I'll find a solution to this if I looked - but is it optimal to be doing it this way?

 

- Instead, maybe I could fill my array in a random order in the first place - and then just pop at the beginning or end??

 

Which is the best solution?

 

Any code to start me off would be great

 

Thanks

 

 

OM

 

[smoseley]

What you're looking for:

 

// Add 40 items to your array

$totalNums = 40; // or whatever

$array = array();

for ($i = 1; $i <= $totalNumbs; $i++)

    $array[] = $i;

 

// Echo them out in random order

$count = count($array);

while ($count > 0) {

    $i = rand(0,$count-1);

    echo $array[$i]

    unset($array[$i])

    $count = count($array);

}

 

[OM2]

thanks for that - that's really helpful

 

i have coded the following (before getting your reply about how best to fill up the array):

 

		var numberoffiles = [1,2,3,4,5,6,7,8,9,10];

	var random_page_index = Math.ceil(Math.random()*numberoffiles.length) - 1;

	var random_page_selector = "random_html_code/random_" + numberoffiles[random_page_index] + ".html";

	numberoffiles.splice(random_page_index, 1); // only removing one index, thus the 1

	$("#random_load1").load
	(
		random_page_selector, function()
		{
			$("#random_load1").trigger("create");
		}
	);

	random_page_index = Math.ceil(Math.random()*numberoffiles.length) - 1;

	random_page_selector = "random_html_code/random_" + numberoffiles[random_page_index] + ".html";

	numberoffiles.splice(random_page_index, 1); // only removing one index, thus the 1

	$("#random_load2").load
	(
		random_page_selector, function()
		{
			$("#random_load2").trigger("create");
		}
	);

	random_page_index = Math.ceil(Math.random()*numberoffiles.length) - 1;

	random_page_selector = "random_html_code/random_" + numberoffiles[random_page_index] + ".html";

	numberoffiles.splice(random_page_index, 1); // only removing one index, thus the 1

	$("#random_load3").load
	(
		random_page_selector, function()
		{
			$("#random_load3").trigger("create");
		}
	);

The above code is for use with jquerymobile

I'm unsure how I can optimise the above
I'm unsure how to use any number for the following code:

	$("#random_loadX").load
	(
		random_page_selector, function()
		{
			$("#random_loadX").trigger("create");
		}
	);

 

(X being the select number)

 

Thanks in advance!

 

 

OM

[OM2]

figured it out (i just thought it would be more complex!):

 

 

for(i = 1; i < 4; i++)

{

random_page_index = Math.ceil(Math.random()*numberoffiles.length) - 1;

 

random_page_selector = "random_html_code/random_" + numberoffiles[random_page_index] + ".html";

 

numberoffiles.splice(random_page_index, 1); // only removing one index, thus the 1

 

var divname = "#random_load" + i;

 

$(divname).load

(

random_page_selector, function()

{

$(divname).trigger("create");

}

);

}

 

thanks for the help

[OM2]

actually, i see u have ur var names with a $

i assume this is ok

i prefer to have my vars be with a $ - helps me identify at a glance

 

what's the recommended practice? to use $ or not to use?

 

thanks

[smoseley]

Haha, just realized this is in the JS forum.... my post was in PHP.

 

Try this:

 

// Add 40 items to your array
totalNums = 40; // or whatever
var arr = [];
for (var i = 1; i <= totalNumbs; i++) 
    arr[] = i;

// Echo them out in random order
var c = arr.length;
while (c > 0) {
    i = Math.floor(Math.random()*c);
    console.log(arr[i]);
    arr.splice(i,1);
    c = arr.length;
}

[OM2]

thanks for that

 

also... i found out in JS u can't do:    arr[] = i;

 

this throws an error - think that is coming from php as well 

[smoseley]

arr.push(i)

 

or

 

arr[arr.length] = i