Preparation code

      
      <script>

        Benchmark.prototype.setup = function() {

          
  function lastObjectMember(node, route) {
    route = route.split('.');
    while (node !== null && node !== undefined && route.length) {
      node = node[route.shift()];
    }
    return node;
  }
  
  function lastObjectMember2(node, route) {
    while (node !== null && node !== undefined && route.length) {
      node = node[route.shift()];
    }
    return node;
  }
  
  var object = {member: {innerMember: true}};
        
  };


      
</script>
    

Test runner

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lastObjectMember(object, 'member.innerMember');

object && object.member && object.member.innerMember;

lastObjectMember2(object, ['member', 'innerMember']);

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