Get sibling elements with an optional filter selector

get-siblings.js

// Get Sibling Elements with Filter
// The getSiblings() and getChildren() code has been customized by @michaelwhyte
// from code found on this Stackoverflow question:
// https://stackoverflow.com/questions/842336/is-there-a-way-to-select-sibling-nodes
//
// The code from the stackoverflow question is based on
// jQuery's siblings() code
function getSiblings(n, filter) {
    return getChildren(n.parentNode.firstChild, n, filter);
}

// Get Children Elements
function getChildren(n, skipMe, filter){
    let r = [];
    for ( ; n; n = n.nextSibling ){ 
       if ( n.nodeType == 1 && n != skipMe){
		   	if(filter){
          if(n.matches(filter)){
            r.push( n );
          }
			  }else{
				  r.push( n );
			  }			
	   }		  
	}        
    return r;
}

// Example Usage

// Example - No Filter
const someEl = document.getElementById('#foo');
const siblings = getSiblings(someEl);

// Example - With Filter
const someOtherEl = document.getElementById('#bar');
const siblings = getSiblings(someOtherEl, 'div');