text notes shift() instead of splice() used in the code

[MadRiver44]

On page 39 of chapter 3, the text below the code for the insert function specifies shift(). It should be corrected to splice() as per the code example.

 function insert(element, after) {
     var insertPos = this.find(after);
      if(insertPos > -1) {
         this.dataStore.splice(insertPos+1, 0, element);
         ++this.listSize;
          return true;
         }
       return false;
}