Question

I want to access elements inside a for loop, which jQuery construct should I use?

eq() or index() and how different are they?

Answer 1

If you were in a loop you would want to use eq() – because .eq() returns the jQuery object at the index passed in.

for( i= 0; i<3; i++){
   $('div').eq(i); // <-- gets div elements from index 0-2
});

If you were using an .each() to loop through it already has the index,element arguments

              //(key,value)  <-- if map
$.each(function(indexInArray, valueOfElement){

});