I'm trying to figure out why the bottom function I've written isn't working properly. Whenever I try to test it out, I get the following error: Uncaught ReferenceError: Invalid left-hand side expression in postfix operation. I'm assuming it's because the code is failing to recognize the "x" string as being the same as the variable x once it's been stripped of it quotation marks when adding to the value of x. Can someone help me finesse this in a way to make it work? If not, can you suggest some alternate approach? Thanks in advance!
var grid = [[null, null, null], [null, null, null], [null, null, null]]; function checkWin() { vals = ["x", "o"]; var x = 0; var o = 0; for (var k = 0; k < vals.length; k++) { var value = vals[k]; for (var i = 0; i < 3; i++) { if (grid[i][i] === value) { (value.replace(/['"]+/g, '')) ++; } if (grid[2 - i][i] === value) { (value.replace(/['"]+/g, '')) ++; } for (var j = 0; j < 3; j++) { if (grid[i][j] === value) { (value.replace(/['"]+/g, '')) ++; } if (grid[j][i] === value) { (value.replace(/['"]+/g, '')) ++; } } } } if (x === 3) { alert("X wins!"); } else if (o === 3) { alert("O wins!"); } }
What about put your data in a object like this:
var _ = {
x : 0,
o : 0
};
and change the value like this:
_[value]++;
I hope this helps.
The following uses objects. The different grid definitions were tested
var grid = [
["o", "x", "x"],
["o", "x", "x"],
["o", "", "o"]];
var grid = [
["o", "x", ""],
["x", "x", "x"],
["o", "o", ""]];
var grid = [
["x", "x", ""],
["o", "x", "o"],
["o", "o", "x"]];
var grid = [
["x", "x", "o"],
["x", "o", "x"],
["o", "x", "x"]];
checkWin(grid)
function checkWin(grid) {
var vals = [{player: "x", value: 0}, {player: "o", value: 0}];
for (var k = 0; k < vals.length; k++) {
for (var i = 0; i < 3; i++) {
// check win by row
vals[k].value = 0;
// check win by col
for (var j = 0; j < 3; j++) {
if (grid[i][j] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by row " + (i+1));
return vals[k].player;
}
// check win by col
vals[k].value = 0;
for (var j = 0; j < 3; j++) {
// check col
if (grid[j][i] === vals[k].player) {
vals[k].value++;
if (vals[k].value === 3) {
// break if you want to know what column won by
break;
}
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by col " + (i+1));
return vals[k].player;
}
}
}
// check win by diag l to r
for (var k = 0; k < vals.length; k++) {
vals[k].value = 0;
for (var i = 0; i < 3; i++) {
if (grid[i][i] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by diag left to right!");
return vals[k].player;
}
}
// check win by diag r to l
for (var k = 0; k < vals.length; k++) {
vals[k].value = 0;
for (var i = 0; i < 3; i++) {
if (grid[i][2-i] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by diag right to left!");
return vals[k].player;
}
}
}
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