Check if multiple elements exist in one if statement in jQuery -

hello using waypoints.js , breaks when not on page targeting.

to fix have check if element exists on page before running waypoints function this:

if (jquery(".section-2-box").length) {    //my code              }  if (jquery(".section-3-box").length) {    //my code              }  if (jquery(".section-4-box").length) {    //my code              } 

it works, problem have many elements need check. dont want have write out 20 if statements.

is possible 1 if statement type of logic if of these elements exist run code?

if know there 1 element each of classes, standard group selector can it:

if (jquery(".section-2-box, .section-3-box, .section-4-box").length === 3) 

if not (there might 2 section-2-boxs , no section-3-box), have throw jquery-specific :firsts in there:

if (jquery(".section-2-box:first, .section-3-box:first, .section-4-box:first").length === 3) 

example:

if (jquery(".section-2-box:first, .section-3-box:first, .section-4-box:first").length === 3) {    console.log("yes");  } else {    console.log("no");  }

<div>we should see "no" because there no .section-3-box</div>  <div class="section-2-box"></div>  <div class="section-2-box"></div>  <div class="section-4-box"></div>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>