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# Comparing two array and sorting the array through javascript

Posted on 2004-10-11
Medium Priority
609 Views
Hi,
I have 2 array ex: arr1,arr2,
in arr1 it has 4 values ex : 1,5,9,10
in arr2 it has 12 values ex : 1,2,3,4,5,6,7,8,9,10,11,12

how to compare these 2 array and filter the arr1 from arr2 ie i want the values that are not in first array but found in 2nd array.
ie i want the values : 2,3,4,6,7,8,11,12

Thanx

0
Question by:mohan21_kumar
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LVL 11

Accepted Solution

pratap_r earned 60 total points
ID: 12277273
hope this will suffice...

a=new Array(5,1,9,10);
b=new Array(1,2,3,4,5,6,7,8,9,10,11,12);

a.sort(sortfunc); //sort using a custom callback
b.sort(sortfunc);

c=new Array();
for(i=0; i < b.length;i++)c[i]=b[i];//make a copy of the array

for(i=0; i < a.length;i++)
{
for(j=0; j < c.length;j++)
{
if(c[j]==a[i])c.splice(j,1);//there is a match, remove the item from the list
}
}

//our custom callback for sorting
function sortfunc(item1,item2)
{
if (parseInt(item1) < parseInt(item2))return -1;
if (parseInt(item1) > parseInt(item2))return +1;
return 0;
}

Enjoy!
Pratap
0

Expert Comment

ID: 12580622
Pratap r's answer should work, but if youre looking for a better understanding of the sort itself try this link:

http://cplusplus.com/ref/cstdlib/qsort.html

http://www.pscode.com/vb/scripts/ShowCode.asp?txtCodeId=6646&lngWId=3
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