methods getArg.ts

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  import argImpl from '../internal/argImpl';
import { IComplex } from '../internal/complex';
import mask from '../internal/mask';
 
export default function getArg (z: IComplex): number {
  if (!(z._mask & mask.HAS_ARG)) {
    z._arg = argImpl(z._real, z._imag);
    z._mask |= mask.HAS_ARG;
  }
 
  return z._arg;
}