javascriptでエラーが発生したのですが...

Question

分からない事

const board_preference = {0: "＋", 1: "○", 2: "●", 3: "■", 4: "＋"};
let board = 
[[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,4,3,0,0,0],
[0,0,4,1,2,3,0,0],
[0,0,3,2,1,4,0,0],
[0,0,0,3,4,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0]];
const user_turn = (user_selection_vertical, user_selection_horizontal) => {
	var user_x = user_selection_vertical;
	var user_y = user_selection_horizontal;
	if (board[user_x][user_y] == 3) {
		board[user_selection_vertical][user_selection_horizontal] = 1;
	}
	let user_turn_flag = true;
	let user_turn_count = 0;
	while (user_turn_flag) {
		user_turn_count++;
		if (!user_x + user_turn_count == 0) {
			if (board[user_x - user_turn_count][user_y] == 2&&board[user_x - (user_turn_count + 1)][user_y] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (!user_x + user_turn_count == 7) {
			if (board[user_x + user_turn_count][user_y] == 2&&board[user_x +(user_turn_count + 1)][user_y] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (!user_y + user_turn_count == 0) {
			if (board[user_x][user_y - user_turn_count] == 2&&board[user_x][user_y - (user_turn_count + 1)] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}	
		}
		if (!user_y + user_turn_count == 7) {
			if (board[user_x][user_y + user_turn_count] == 2&&board[user_x][user_y + (user_turn_count + 1)] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (user_turn_count == 7) {user_turn_flag = false;}
	}
}

上記のコードにて41行目、39文字から

		if (!user_x + user_turn_count == 7) {
			if (board[user_x + user_turn_count][user_y] == 2&&board[user_x +(user_turn_count + 1)][user_y] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}

多分上記のコードで
TypeError: Cannot read property '2' of undefined
と出たのですがどうすればよいでしょうか?

全コード

const board_preference = {0: "＋", 1: "○", 2: "●", 3: "■", 4: "＋"};
let board = 
[[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,4,3,0,0,0],
[0,0,4,1,2,3,0,0],
[0,0,3,2,1,4,0,0],
[0,0,0,3,4,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0]];
//ban[index(縦)][index(横)]
let board_evaluation = 
[[20,3,10,0,0,10,3,20],
[3,3,0,0,0,0,3,3],
[10,0,10,1,0,10,0,10],
[0,0,1,0,0,0,0,0],
[0,0,0,0,0,2,0,0],
[10,0,10,0,1,10,0,10],
[3,3,0,0,0,0,3,3],
[20,3,10,0,0,10,3,20]];

const reset = () => {board=[[0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0],[0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0],[0x0,0x0,0x0,0x4,0x3,0x0,0x0,0x0],[0x0,0x0,0x4,0x1,0x2,0x3,0x0,0x0],[0x0,0x0,0x3,0x2,0x1,0x4,0x0,0x0],[0x0,0x0,0x0,0x3,0x4,0x0,0x0,0x0],[0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0],[0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0]];}
/*board_display()*/var _0x49ff=['am9pbg==','bWFw'];(function(_0xdedc5e,_0x49ff3a){var _0x4e46b9=function(_0x74ab93){while(--_0x74ab93){_0xdedc5e['push'](_0xdedc5e['shift']());}};_0x4e46b9(++_0x49ff3a);}(_0x49ff,0x9e));var _0x4e46=function(_0xdedc5e,_0x49ff3a){_0xdedc5e=_0xdedc5e-0x0;var _0x4e46b9=_0x49ff[_0xdedc5e];if(_0x4e46['Rkxcwg']===undefined){(function(){var _0x18c8e9=function(){var _0x1b3f3b;try{_0x1b3f3b=Function('return\x20(function()\x20'+'{}.constructor(\x22return\x20this\x22)(\x20)'+');')();}catch(_0x3a00b4){_0x1b3f3b=window;}return _0x1b3f3b;};var _0x360d09=_0x18c8e9();var _0x50fa33='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';_0x360d09['atob']||(_0x360d09['atob']=function(_0x4b0b7d){var _0x49d38b=String(_0x4b0b7d)['replace'](/=+$/,'');var _0x545020='';for(var _0x27b1c7=0x0,_0x24e6cc,_0x14c530,_0x3d7291=0x0;_0x14c530=_0x49d38b['charAt'](_0x3d7291++);~_0x14c530&&(_0x24e6cc=_0x27b1c7%0x4?_0x24e6cc*0x40+_0x14c530:_0x14c530,_0x27b1c7++%0x4)?_0x545020+=String['fromCharCode'](0xff&_0x24e6cc>>(-0x2*_0x27b1c7&0x6)):0x0){_0x14c530=_0x50fa33['indexOf'](_0x14c530);}return _0x545020;});}());_0x4e46['BTpKSp']=function(_0x4fd43c){var _0x138871=atob(_0x4fd43c);var _0x2ba398=[];for(var _0x3b08aa=0x0,_0x286fb0=_0x138871['length'];_0x3b08aa<_0x286fb0;_0x3b08aa++){_0x2ba398+='%'+('00'+_0x138871['charCodeAt'](_0x3b08aa)['toString'](0x10))['slice'](-0x2);}return decodeURIComponent(_0x2ba398);};_0x4e46['RFjWFU']={};_0x4e46['Rkxcwg']=!![];}var _0x74ab93=_0x4e46['RFjWFU'][_0xdedc5e];if(_0x74ab93===undefined){_0x4e46b9=_0x4e46['BTpKSp'](_0x4e46b9);_0x4e46['RFjWFU'][_0xdedc5e]=_0x4e46b9;}else{_0x4e46b9=_0x74ab93;}return _0x4e46b9;};function board_display(){var _0x49d38b=board['map'](_0x545020=>_0x545020[_0x4e46('0x1')](_0x27b1c7=>board_preference[_0x27b1c7])[_0x4e46('0x0')](''))[_0x4e46('0x0')]('\x0a');return _0x49d38b;}

const user_turn = (user_selection_vertical, user_selection_horizontal) => {
	var user_x = user_selection_vertical;
	var user_y = user_selection_horizontal;
	if (board[user_x][user_y] == 3) {
		board[user_selection_vertical][user_selection_horizontal] = 1;
	}
	let user_turn_flag = true;
	let user_turn_count = 0;
	while (user_turn_flag) {
		user_turn_count++;
		if (!user_x + user_turn_count == 0) {
			if (board[user_x - user_turn_count][user_y] == 2&&board[user_x - (user_turn_count + 1)][user_y] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (!user_x + user_turn_count == 7) {
			if (board[user_x + user_turn_count][user_y] == 2&&board[user_x +(user_turn_count + 1)][user_y] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (!user_y + user_turn_count == 0) {
			if (board[user_x][user_y - user_turn_count] == 2&&board[user_x][user_y - (user_turn_count + 1)] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}	
		}
		if (!user_y + user_turn_count == 7) {
			if (board[user_x][user_y + user_turn_count] == 2&&board[user_x][user_y + (user_turn_count + 1)] == 1) {
				changehost(user_x - user_turn_count,user_y,1);
			}
		}
		if (user_turn_count == 7) {user_turn_flag = false;}
	}
}

const changehost = (host_selection_vertical, host_selection_horizontal,Human) => {
	let host_x = host_selection_vertical;
	let host_y = host_selection_horizontal;
	board[host_x][host_y] = Human;
}
user_turn(4,2);
console.log(board_display());

Comments

[m.ts10806]

どこで出てますでしょうか。提示コード単体だと何も出力されないので、デバッグして確認してください。

[-Soso-]

41行目、39文字から出てます
上
if (!user_x + user_turn_count == 7) {
if (board[user_x + user_turn_count][user_y] == 2&&board[user_x +(user_turn_count + 1)][user_y] == 1) {
changehost(user_x - user_turn_count,user_y,1);
}
}

[otn]

おそらく実行したファイルと質問にコピペしたフィアルが別です。

Answer 1

エラーの直接的な原因は、user_x + user_turn_countが7を超えており、board[11][2]とかってなるからです。
その処理に入るif文が何を意味するのかはわかりませんが、論理Not(!)がuser_xにくっついており、false + user_turn_count == 7、つまりuser_turn_countが7の場合にif文に入るようになっているはずです。user_xが4なので、4+7でboard[11]になります。
そもそもxxx == 7を条件とするのがおかしい気がしますので、もう一度条件を見直してみてください。

Comments

[-Soso-]

回答ありがとうございます
成功しました!