Comparing two arrays using javascript

Question

var array1 = [column1,column2,column3,column4];
var array2 = [column1 [empid],column2 [mobno],column4 [place]];

if array1 has any of array2 values. I mean, in above case column1,column2,column4 is there in array1, then remove those values and array1 should have only column3 and then append array1 value with array2.
after check and remove, now array1 = [column3] then append array1 value with array2 and finally
array2 = [column1 [empid],column2 [mobno],column3,column4 [place]]; it should be in correct index position

is above case possible?

Cubed Eye · Accepted Answer · 2013-04-12 10:01:18Z

1

I would recommend using a library like Underscore.js, it has functions like _.union() that would do what you described. If you don't want to the library you could have a look at their implementation.

Using your example:

array2 = _.union(array1, array2);

edited Apr 12, 2013 at 10:01

answered Apr 12, 2013 at 9:55

Cubed Eye

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3 Comments

Rachel Over a year ago

can you tell me how to use _.union. am getting error: _is not defined

Cubed Eye Over a year ago

@Rachel you need to download and import underscore.js into your project. It's not built in to the browser

Cubed Eye Over a year ago

@Rachel as I said in my answer, you could have a look in the underscore.js source to see what the _.union() function is doing.

harsh · Accepted Answer · 2013-04-12 10:15:42Z

0

if you dont want to use any library then you can do

for(elem in array2){



    var index = array1.indexOf(array2[elem]);
    if(index > -1)
    array1.splice(index,1);


}

array2 = array1.concat(array2).sort();

answered Apr 12, 2013 at 10:15

harsh

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