als-statistics/lib/table/extract-metric.js

A powerful and lightweight JavaScript library for descriptive statistics, regression, clustering, outlier detection, and noise analysis using a flexible table/column architecture.

const newColumn = require('../utils/new-column')
function extractMetric(col, metricName) {
   const keys = metricName.split('.')
   let value = col;
   for (let i = 0; i < keys.length; i++) {
      if (value === undefined) break;
      value = value[keys[i]];
      if (Array.isArray(value) && value.length) value = newColumn(value)
   }

   return value;
}

function extractMetrics(columns,metricName) {
   return Object.values(columns)
      .map(col => extractMetric(col, metricName))
      .filter(v => v !== undefined)
}

module.exports = extractMetrics