feat(new-tool): simple benchmark calculator

src/tools/benchmark-builder/benchmark-builder.models.ts

@@ -0,0 +1,34 @@
+import _ from 'lodash';
+
+export { computeAverage, computeVariance, arrayToMarkdownTable };
+
+function computeAverage({ data }: { data: number[] }) {
+  if (data.length === 0) {
+    return 0;
+  }
+
+  return _.sum(data) / data.length;
+}
+
+function computeVariance({ data }: { data: number[] }) {
+  const mean = computeAverage({ data });
+
+  const squaredDiffs = data.map((value) => Math.pow(value - mean, 2));
+
+  return computeAverage({ data: squaredDiffs });
+}
+
+function arrayToMarkdownTable({ data, headerMap = {} }: { data: unknown[]; headerMap?: Record<string, string> }) {
+  if (!Array.isArray(data) || data.length === 0) {
+    return '';
+  }
+
+  const headers = Object.keys(data[0]);
+  const rows = data.map((obj) => Object.values(obj));
+
+  const headerRow = `| ${headers.map((header) => headerMap[header] ?? header).join(' | ')} |`;
+  const separatorRow = `| ${headers.map(() => '---').join(' | ')} |`;
+  const dataRows = rows.map((row) => `| ${row.join(' | ')} |`).join('\n');
+
+  return `${headerRow}\n${separatorRow}\n${dataRows}`;
+}