victory-native/src/cartesian/utils/getYScaleInputBounds.ts

A charting library for React Native with a focus on performance and customization.

import type { YAxisDomain } from "../../types";

export const getYScaleInputBounds = ({
  data,
  yKeys,
  domain,
  tickDomain,
}: {
  data: Record<string, unknown>[];
  yKeys: string[];
  domain?: YAxisDomain;
  tickDomain?: YAxisDomain;
}) => {
  const yMin =
    domain?.[0] ??
    tickDomain?.[0] ??
    Math.min(
      ...yKeys.map((key) => {
        return data.reduce((min, curr) => {
          if (typeof curr[key] !== "number") return min;
          return Math.min(min, curr[key] as number);
        }, Infinity);
      }),
    );
  const yMax =
    domain?.[1] ??
    tickDomain?.[1] ??
    Math.max(
      ...yKeys.map((key) => {
        return data.reduce((max, curr) => {
          if (typeof curr[key] !== "number") return max;
          return Math.max(max, curr[key] as number);
        }, -Infinity);
      }),
    );

  return { yMin, yMax };
};