Rename javascript to js

js/snippets/object-to-query-string.md

@@ -0,0 +1,35 @@
+---
+title: Object to query string
+type: snippet
+tags: [object]
+cover: standing-stones
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Generates a query string from the key-value pairs of the given object.
+
+- Use `Array.prototype.reduce()` on `Object.entries()` to create the query string from `queryParameters`.
+- Determine the `symbol` to be either `?` or `&` based on the length of `queryString`.
+- Concatenate `val` to `queryString` only if it's a string.
+- Return the `queryString` or an empty string when the `queryParameters` are falsy.
+
+```js
+const objectToQueryString = queryParameters => {
+  return queryParameters
+    ? Object.entries(queryParameters).reduce(
+        (queryString, [key, val], index) => {
+          const symbol = queryString.length === 0 ? '?' : '&';
+          queryString +=
+            typeof val === 'string' ? `${symbol}${key}=${val}` : '';
+          return queryString;
+        },
+        ''
+      )
+    : '';
+};
+```
+
+```js
+objectToQueryString({ page: '1', size: '2kg', key: undefined });
+// '?page=1&size=2kg'
+```