signMask property
int signMaskExtract the sign bits from each lane return them in the first 4 bits. "x" lane is bit 0. "y" lane is bit 1. "z" lane is bit 2. "w" lane is bit 3.
Source
int get signMask;
© 2012 the Dart project authors
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https://api.dartlang.org/stable/1.24.3/dart-typed_data/Float32x4/signMask.html