format method
Implementation
String format([int x0 = 0])
=> '[ ${[
[m0, m1, m2, m3].map((x) => x.toStringAsFixed(x0)).join(', '),
[m4, m5, m6, m7].map((x) => x.toStringAsFixed(x0)).join(', '),
[m8, m9, m10, m11].map((x) => x.toStringAsFixed(x0)).join(', '),
[m12, m13, m14, m15].map((x) => x.toStringAsFixed(x0)).join(', '),
].join('\n')} ]';