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?

Answer 1

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();

Answer 2

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);