how can i find all duplicate values within an array?

FAQTs - Knowledge Base - View Entry - how can i find all duplicate values within an array?

how can i find all duplicate values within an array?
Sep 10th, 2004 13:29

Gavin Kistner, Jean-Bernard Valentaten, Periklis a





Well, there is more than one way to achieve this.
The easiest one is to walk the array position by position with two
loops:

for (var i=0; i{
for (var j=i+1; j {
if (myArray[i] == myArray[j])
myArray[j] = '';
}
}

This will do the job, but is very inefficient (especially with large
arrays), since a lot of comparisons are made. One might start to
optimize this code, but believe me, a slow algorithm will always stay
slow, no matter how much you optimize it.
The better way is to sort the array and then have a loop walk it once:

myArray.sort();

for (var i=0; i{
if (myArray[i] == myArray[i+1])
myArray[i+1] = '';
}

Note that the above solution does not account for objects stored in
the array which may be technically different (== computes to false)
but trivially the same. For example:

var myArray = [
{ name:'Gavin', age:31 },
{ name:'Lisa', age:30 },
{ name:'Gavin', age:23 },
{ name:'Gavin', age:31 }
];

In the above, technically
myArray[0] != myArray[3]
even though you know it is. For something like this you can write your
own comparison function:

Array.prototype.removeDuplicates = function( customCompare ){
if ( customCompare ){
this.sort(customCompare);
for (var i=0; i<(this.length-1); i++)
{
if ( !customCompare(this[i],this[i+1]) ){
this.splice( (i--)+1, 1 );
}
}
}else{
this.sort();
for (var i=0; i<(this.length-1); i++)
{
if (this[i]==this[i+1]){
this.splice( (i--)+1, 1 );
}
}
}
return this;
}


You would call the above passing in the same sort of custom comparison
function as the myArray.sort() method takes:

myArray.removeDuplicates( function(a,b){
return a.nameb.name ? 1 :
a.age b.age ? 1 : 0;
} );

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So you've tried this and still get an error. Take a look at Step 3, this
should address the remaining issue.

OPTION B: If you want to use SQL Browser service perform these steps:

Note:
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Next, restart the sqlbrowser service.

1. Start the SQL Browser Service

STEP 3: Firewall..?

At this point you should be able to remotely connect. If you still
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To enable the firewall to allow SQL Server Express traffic:

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panel.

2. Click the Exceptions Tab

3. Click the "Add Programs." button and select "sqlservr.exe" from the
location where you install SQL Server Express


You should be able to remotely connect. Note, you can get more restrictive
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configured with Option A).

Note: If you chose to use the SQL Browser service, you must also add
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