isNaN static method

bool isNaN(
  1. dynamic value
)

Implementation

static bool isNaN(dynamic value) {
  if (value == '-') return true; // 指标计算-比较多
  if (value == null) return true;
  if (value is num) return value.isNaN;
  try {
    return num.parse(value.toString()).isNaN;
  } catch (_) {
    return true;
  }
}