Checkerboard programming
function draw_checkerboard(board) {
for (var i = 0; i < 8; i++) {
for (var j = 0; j < 8; j++) {
if (i == 0 || j == 0 || i == 7 || j == 7) board[i][j] = "white";
else board[i][j] = "black";
}
}
}
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