Creating A Function Utilising An Array

I am trying to create a function that adds to specific array, then
checks the array to determine whether to alert 'Yes' or 'No'.

Note this is a simplified version of the function I have created. This
function will be used with different arrays.

function change_value (check_value, array_name, array_number){

if (check_value == 'yes'){
array_name[array_number]='Y'
}
else{
delete array_name[array_number];
}

// check if there is a 'Y' anywhere in the array
if(array_name.length>0){
alert('Yes');
}
else{
alert('No');
}
return array_name;
}