maybe a bug in conway's game of life?

[JeremyFan]

Hi Marijn,
When count neighbors, the cells at the end of right would count with the cells at the start of next row.

in the end of the inner loop, 'x1' will be 'width', then 'x1+y1*width' will be next row. So I ignore this condition.

[marijnh]

Doesn't the fact that the loop only goes to Math.min(width, x + 1) already take care of this?

[JeremyFan]

Maybe no...say width is 30, when x is 29, count neighbors. than the loop will be for (var x1 =28; x1 <=30; x1++), so still loop 3 times, and in the last time,x1 is 30, equals to width, x1 + y1 * width will be (y1+1)*width, means first cell in next row.

I test the situation in the picture. when the threes live cells in first column, the cell with blue border will be live in next generation...

[marijnh]

Good point! Since I'm using <=, I should be clipping to width - 1 and height - 1. Attached patch fixes this.

[JeremyFan]

Oh, you're great. And thanks for this awesome book!