Question

Here is one to get your brain going! I’ve not had any luck with it.

[1,2,1,1,2,1,1,1,2,2]

[1,2,1,1,2,1]

I would like to use the second array to find the values in the first, but they must be in the same order.

Once for I would like it to return the next key up from the last key in the second array.

So in this example it would use the first six digits in the first array and then return 6 as the key after the final one in the second array.

Answer 1

  var a2 =  [1,2,1,1,2,1,1,1,2,2]
var a1 = [1,2,1,1,0,1]
function find(arr1, arr2) {
    var len = 1
    var result = 0;
    var s2 = arr2.toString();
    for (len=1;len <= a1.length; len++)
    {
        var aa1 = arr1.slice(0, len)
        var s1 = aa1.toString();
        if(s2.indexOf(s1)>=0){
            result = aa1.length; 
        }
        else {
            break;
        }
    }
    return result;
}
alert(find(a1, a2));