You'll still have a chance to hit a number low enough not to yield a 3- or 6-digit hex number, which will result in an invalid color (0x0-0xFF, 0x1000-0xfffff). To solve that, you can use
'#' + (0x1000000 + 0x1000000 * Math.random() | 0).toString(16).slice(-6)
instead.
Good point, forgot about that. A simpler fix would probably be hexStr.padStart(6, '0').
hexStr.padStart(6, '0')
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You'll still have a chance to hit a number low enough not to yield a 3- or 6-digit hex number, which will result in an invalid color (0x0-0xFF, 0x1000-0xfffff). To solve that, you can use
instead.
Good point, forgot about that. A simpler fix would probably be
hexStr.padStart(6, '0').