@mui/x-charts/internals/findClosestIndex.mjs

The community edition of MUI X Charts components.

import { getAsNumber } from "./getAsNumber.mjs";

/**
 * Returns the index of the entry in `axisData` whose numeric value is closest
 * to `valueAsNumber`. Returns -1 if `axisData` is empty.
 */
export function findClosestIndex(axisData, valueAsNumber) {
  return axisData.findIndex((pointValue, index) => {
    const v = getAsNumber(pointValue);
    if (v > valueAsNumber) {
      if (index === 0 || Math.abs(valueAsNumber - v) <= Math.abs(valueAsNumber - getAsNumber(axisData[index - 1]))) {
        return true;
      }
    }
    if (v <= valueAsNumber) {
      if (index === axisData.length - 1 || Math.abs(valueAsNumber - v) < Math.abs(valueAsNumber - getAsNumber(axisData[index + 1]))) {
        return true;
      }
    }
    return false;
  });
}