Help Array!!!!! - Page 2

jmrker · 12-31-2012, 04:39 AM

And adding to 'Logic Ali's brilliant code ...

Code:

<script type="text/javascript">

array1 = [ 1, 4, 2, 13, 5 ];

odds = array1.slice( 0 ).filter( function( elem ){ return elem % 2; } )
evens = array1.slice( 0 ).filter( function( elem ){ return elem%2==0; } )

alert( odds + '\n\n' + evens );

</script>

Logic Ali · 12-31-2012, 04:48 AM

Quote:

Originally Posted by jmrker

And adding to 'Logic Ali's brilliant code ...

Code:

<script type="text/javascript">

array1 = [ 1, 4, 2, 13, 5 ];

odds = array1.slice( 0 ).filter( function( elem ){ return elem % 2; } )
evens = array1.slice( 0 ).filter( function( elem ){ return elem%2==0; } )

alert( odds + '\n\n' + evens );

</script>

Actually I should have remembered that .slice is unnecessary with .filter.

jmrker · 12-31-2012, 02:57 PM

Even better...

Code:

<script type="text/javascript">

array1 = [ 1, 4, 2, 13, 5 ];

odds = array1.filter( function( elem ){ return elem % 2; } )
evens = array1.filter( function( elem ){ return elem%2==0; } )

alert( odds + '\n\n' + evens );

</script>

Logic Ali · 12-31-2012, 04:05 PM

Quote:

Originally Posted by jmrker

Even better...

Code:

<script type="text/javascript">

array1 = [ 1, 4, 2, 13, 5 ];

odds = array1.filter( function( elem ){ return elem % 2; } )
evens = array1.filter( function( elem ){ return elem%2==0; } )

alert( odds + '\n\n' + evens );

</script>

Now all you need is for Windows XP (IE8) to become 100% extinct, and you'll be able to use it in practice.

jmrker · 12-31-2012, 04:45 PM

Quote:

Originally Posted by Logic Ali

Now all you need is for Windows XP (IE8) to become 100% extinct, and you'll be able to use it in practice.

Well bummer!

007julien · 12-31-2012, 05:16 PM

About commas... The window's alert method apply the method toString() at is content. Then it's possible to see simple objects with a toString() method for objects

Code:

Object.prototype.toString=function(){var i,c='\n';for (i in this) if (this.hasOwnProperty(i)) c+=i+':'+this[i]+'\n';return c}

var NewYork={lat:"N 40° 42' 31’’",lng:"74° 0’ 34’’"}
alert(NewYork)

AndrewGSW · 12-31-2012, 05:36 PM

The following code allows filter for older browsers: Mozilla

Code:

if (!Array.prototype.filter)
{
  Array.prototype.filter = function(fun /*, thisp */)
  {
    "use strict";
 
    if (this == null)
      throw new TypeError();
 
    var t = Object(this);
    var len = t.length >>> 0;
    if (typeof fun != "function")
      throw new TypeError();
 
    var res = [];
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
    {
      if (i in t)
      {
        var val = t[i]; // in case fun mutates this
        if (fun.call(thisp, val, i, t))
          res.push(val);
      }
    }
 
    return res;
  };
}

triko · 01-01-2013, 09:05 PM

O god!! How much comment

Guys I don t have never see all your methid .filter, \n\, ecc... ????
I'm beginner of Javascript, i think that .join it's sufficient for a right code

This is final code

Code:

<!DOCTYPE HTML>
<html>
<head> <title> Selection </title>
<script type = "text/javascript">
function evenOdd ()
{
    var arrayPrincipal = [4, 2,53, 4, 12, 7, 20, 13, 0, 5];
    var arrayEven = [];
    var arrayOdd = [];
    for (i = 0; i < arrayPrincipal.length; i++)
    {
        var evenOdd = arrayPrincipal [i];
        var remainder = evenOdd%2;
        if (remainder == 0)
            arrayEven [i] = arrayPrincipal [i];
        else
            arrayOdd [i] = arrayPrincipal [i];
    }			
    alert ("This is Array Even" + " " + arrayEven.join (" "));
    alert ("This is Array Odd" + " " + arrayOdd.join (" "));
}
</script>
<body>
<button type = "button" onclick = "evenOdd ()"> Build Symmetric </button>
</body>
</html>

My problem is that in all 2 array i have the position null!!! And then I write .join have other comma!!!!

triko · 01-01-2013, 09:13 PM

Quote:

Originally Posted by Logic Ali

Actually I should have remembered that .slice is unnecessary with .filter.

This is right but my problem ask, Build 2 new array and insert into one the even numbers and into other the odd numbers!!!!

jmrker · 01-01-2013, 11:08 PM

The reason you are getting null in the array is that you are NOT assigning anything
to the even/odd arrays when the test array is odd/even.
Those positions are not defined when the test fails,
and then you are skipping over the element positions
when you increment the 'i' variable.

The should be you "final code"

Code:

<!DOCTYPE HTML>
<html>
<head> <title> Selection </title>
<script type = "text/javascript">
var arrayPrincipal = [4, 2,53, 4, 12, 7, 20, 13, 0, 5];
function evenOdd () {
    var arrayEven = [];
    var arrayOdd = [];
    for (i = 0; i < arrayPrincipal.length; i++) {
      if (arrayPrincipal[i]%2==0) { arrayEven.push(arrayPrincipal[i]); }
                             else { arrayOdd.push(arrayPrincipal[i]); }
    }
    alert ("This is Array Even" + " " + arrayEven.join (" ")+"\nThis is Array Odd" + " " + arrayOdd.join (" "));
}
</script>
<body>
<button type = "button" onclick = "evenOdd()"> Build Symmetric </button>
</body>
</html>

triko · 01-03-2013, 05:21 PM

OOOOOOOOOOOOooh!

It's so cool!!!! Thanks so much guy!!!