javascript - Getting Error, "Cannot set property [0] of undefined" -


trying practice writing hangman program, , @ part function loop on word guessed, , set dashes '_' array based on length of word guessed. working until added function "putdashes()" take dashes in array , add them html on screen user guess. getting error, "cannot set property [0] of undefined". please assist

function wordselect(selectdashes){      // define wordbank object     wordbank =["westworld", "startrek", "legion", "gameofthrones", "archer", "simpsons", "bobsburgers", "janethevirgin", "seinfeld", "rachelmaddow"];      // pick random word wordbank     currentword = wordbank[(math.floor(math.random()*wordbank.length+1))];     console.log(currentword);      selectedword=[];      selectedword=currentword.split("");      for(var i=0; i<currentword.length; i++) {         selectdashes[i]="_";         // selectdashes.push("_");     }      console.log(selectedword);     console.log(selectdashes);      lettersremaining=selectedword.length;      document.getelementbyid("lettersnword").innerhtml=lettersremaining;        guessesremaining=5;     document.getelementbyid("guesscounter").innerhtml=guessesremaining;      putdashes(); };


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