javascript - Why won't my comparison array work? -


i building game want take player inputs prompts for, , compare them inputs have used, , reject choice if choose same thing twice. here relevant code:

var playerchoicerow = 0; var playerchoicecolumn = 0; var playerattackarray = [];  function playerattack(playerchoicerow,playerchoicecolumn) { (var i=0; i<playerattackarray.length; i++){     if ([playerchoicerow,playerchoicecolumn] === playerattackarray[i]){         alert("you have attacked space, please choose another.");         playerchoicerow = prompt("please choose number between 0 , 5.");         playerchoicecolumn = prompt("please choose number between 0 , 5.");     } } if (playerchoicerow === undefined){     alert("please choose number between 0 , 5!");     playerchoicerow = prompt("please choose number between 0 , 5."); } if (playerchoicecolumn === undefined){     alert("please choose number between 0 , 5!");     playerchoicecolumn = prompt("please choose number between 0 , 5."); } playerattackarray.push([playerchoicerow,playerchoicecolumn]);  while (playercounter || computercounter <=4){     var playerchoicerow = prompt("please select row of attack. (0 though 5)")-'';     var playerchoicecolumn = prompt("please select column of attack. (0 though 5)")-'';     playerattack(playerchoicerow,playerchoicecolumn);     if (playercounter == 5){         alert("you have sunk enemy boats!");         break;     } }

in javascript array comparison identity, not content; in other words === between 2 expressions when they're arrays returns true if referring same array object, not if they're 2 arrays containing same things.

you work around problem converting both sides strings first:

if (""+[playerchoicerow,playerchoicecolumn] === ""+playerattackarray[i]) ...

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