starting Safety Signal (All drugs)

docs/SymptomsCausedByDrugs/js/PrrByKey2CsvConverter.js

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+class PrrByKey2CsvConverter {
+
+    static convertPrrByKey2Csv(
+        {
+            heading,
+            columns: { keyColumn, prrColumn },
+            prrByKey
+        }
+    ) {
+        return heading + '\n\n' +
+            PrrByKey2CsvConverter.#convert2Csv(
+                {
+                    prrByKey: PrrByKey2CsvConverter.#quoteKeys(prrByKey),
+                    keyColumn: PrrByKey2CsvConverter.#quote(keyColumn),
+                    prrColumn: PrrByKey2CsvConverter.#quote(prrColumn)
+                });
+    }
+
+    static #quoteKeys(prrByKey) {
+        return Object.fromEntries(
+            Object
+                .entries(prrByKey)
+                .map(([key, prr]) => [PrrByKey2CsvConverter.#quote(key), prr]))
+    }
+
+    static #quote(str) {
+        return '"' + str + '"';
+    }
+
+    static #convert2Csv({ prrByKey, keyColumn, prrColumn }) {
+        const header = `${keyColumn},${prrColumn}`;
+        return `${header}\n${PrrByKey2CsvConverter.#convertDict2Csv(prrByKey)}`;
+    }
+
+    static #convertDict2Csv(dict) {
+        return Object
+            .entries(dict)
+            .map(([key, value]) => `${key},${value}`)
+            .join('\n');
+    }
+}