@antv/l7-utils/es/statistics.js

function max(x) {
  if (x.length === 0) {
    throw new Error('max requires at least one data point');
  }

  var value = x[0];

  for (var i = 1; i < x.length; i++) {
    if (x[i] > value) {
      value = x[i];
    }
  }

  return value * 1;
}

function min(x) {
  if (x.length === 0) {
    throw new Error('min requires at least one data point');
  }

  var value = x[0];

  for (var i = 1; i < x.length; i++) {
    if (x[i] < value) {
      value = x[i];
    }
  }

  return value * 1;
}

function sum(x) {
  if (x.length === 0) {
    return 0;
  }

  var sumNum = x[0] * 1;

  for (var i = 1; i < x.length; i++) {
    sumNum += x[i] * 1;
  }

  return sumNum;
}

function mean(x) {
  if (x.length === 0) {
    throw new Error('mean requires at least one data point');
  }

  return sum(x) / x.length;
}

function mode(x) {
  if (x.length === 0) {
    throw new Error('mean requires at least one data point');
  }

  if (x.length < 3) {
    return x[0];
  }

  x.sort();
  var last = x[0];
  var value = NaN;
  var maxSeen = 0;
  var seenThis = 1;

  for (var i = 1; i < x.length + 1; i++) {
    if (x[i] !== last) {
      if (seenThis > maxSeen) {
        maxSeen = seenThis;
        value = last;
      }

      seenThis = 1;
      last = x[i];
    } else {
      seenThis++;
    }
  }

  return value * 1;
}

export { sum, max, min, mean, mode };
export var statMap = {
  min: min,
  max: max,
  mean: mean,
  sum: sum,
  mode: mode
};
export function getColumn(data, columnName) {
  return data.map(function (item) {
    return item[columnName];
  });
}
export function getSatByColumn(type, column) {
  return statMap[type](column);
}
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