Add objectToQueryString utility function and it's unit tests

snippets/objectToQueryString.md

@@ -0,0 +1,27 @@
+---
+title: objectToQueryString
+tags: utility,object,function,intermediate
+---
+
+Generates a query string from key values pairs from given object.
+
+Attaches `?` in front of query string and ignores any non-string
+values and their corresponding keys from given object. The function
+returns empty string as a result if there is no single valid
+key-value pair in given object, else returns generated query string.
+
+```js
+const objectToQueryString = (queryParameters) => {
+  return queryParameters
+    ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
+        const symbol = index === 0 ? '?' : '&';
+        queryString += (typeof val === "string") ? `${symbol}${key}=${val}` : '';
+        return queryString;
+      }, '')
+    : '';
+};
+```
+
+```js
+objectToQueryString({page: '1', size: "2kg", key: undefined}); // '?page=1&size=2kg'
+```