Question

array ref.length = 7 (0 – 6), and I want to try to match ref[0][‘x’] to ref[1][‘x’] I am doing this:

   for(var i=0;i<ref.length;i++){
      if( ref[i]['x'] != ref[i+1]['x'] && ref[i+1]['x'].length > 0 )
         //do something
   }

The for loop is iterating all the way to array number 6 then element 6+1 is blank so I get an error on the if statement line saying ref[i+1] is undefined….

is there a better way to do this?

Answer 1

for (var i=0; i<ref.length-1; i++) { // Note the "-1".

This way when you use the index i+1 you’re still in bounds.