var thunder_strike = []; var strikes = 0, led_fills = []; for (var row = 0; row < 11; row++) { led_fills[row] = []; for (var col = 0; col < 21; col++) led_fills[row][col] = 0; } var isLastRowFilled = false; function create_thunder_strike() { document.getElementById("thunder_gadget").innerHTML = ""; for (var row = 0; row < 11; row++) { thunder_strike[row] = []; for (var i = 0; i < 10 - row; i++) thunder_strike[row].push(" "); for (var j = 0; j < row + 1; j++) { thunder_strike[row].push("@"); if (j < row) thunder_strike[row].push(" "); } for (var k = 0; k < 10 - row; k++) thunder_strike[row].push(" "); document.getElementById("thunder_gadget").innerHTML += thunder_strike[row].join("") + "\n"; } } function thunder_strike_gadget() { setTimeout(function() { doSetTimeout(0, 10); }, 200); } function doSetInterval() { setInterval(function() { create_thunder_strike(); thunder_strike_gadget(); document.getElementById("gadget_strikes").innerHTML = "Strike: " + ++strikes; if (strikes === 21) { document.getElementById("gadget_fills").innerHTML = "Times each LED is switched on after 20 strikes:
"; for (var row = 0; row < 11; row++) { document.getElementById("gadget_fills").innerHTML += "\n"; for (var col = 0; col < 21; col++) document.getElementById("gadget_fills").innerHTML += thunder_strike[row][col] === " " ? " " : led_fills[row][col] < 10 ? "0" + led_fills[row][col] : led_fills[row][col]; } } var lastRowFills = 0; for (var col = 0; col < 11; col++) if (led_fills[10][2 * col] > 0) lastRowFills++; if (!isLastRowFilled && lastRowFills === 11) { isLastRowFilled = true; document.getElementById("gadget_status").innerHTML += "Every LED in the last row is switched on atleast once after " + (strikes - 1) + " strikes!"; } }, 1800); } function doSetTimeout(curr_row, curr_col) { setTimeout(function() { curr_col += curr_row === 0 ? 0 : Math.random() < 0.5 ? -1 : +1; thunder_strike[curr_row][curr_col] = "@"; led_fills[curr_row][curr_col]++; document.getElementById("thunder_gadget").innerHTML = ""; for (row = 0; row < 11; row++) document.getElementById("thunder_gadget").innerHTML += thunder_strike[row].join("") + "\n"; if (curr_row < 10) doSetTimeout(curr_row + 1, curr_col); }, 100); }

Challenge 91 (By JPM7)