Travis build: 1511

README.md

@@ -494,6 +494,7 @@ _30s.average(1, 2, 3);
 * [`isBrowser`](#isbrowser)
 * [`mostPerformant`](#mostperformant)
 * [`nthArg`](#ntharg)
+* [`objectToQueryString`](#objecttoquerystring)
 * [`parseCookie`](#parsecookie)
 * [`prettyBytes`](#prettybytes-)
 * [`randomHexColorCode`](#randomhexcolorcode)
@@ -1724,8 +1725,8 @@ const join = (arr, separator = ',', end = separator) =>
       i === arr.length - 2
         ? acc + val + end
         : i === arr.length - 1
-          ? acc + val
-          : acc + val + separator,
+        ? acc + val
+        : acc + val + separator,
     ''
   );
 ```
@@ -4273,10 +4274,10 @@ const getMeridiemSuffixOfInteger = num =>
   num === 0 || num === 24
     ? 12 + 'am'
     : num === 12
-      ? 12 + 'pm'
-      : num < 12
-        ? (num % 12) + 'am'
-        : (num % 12) + 'pm';
+    ? 12 + 'pm'
+    : num < 12
+    ? (num % 12) + 'am'
+    : (num % 12) + 'pm';
 ```
 
 <details>
@@ -5488,11 +5489,11 @@ Throws an exception if `n` is a negative number.
 const factorial = n =>
   n < 0
     ? (() => {
-      throw new TypeError('Negative numbers are not allowed!');
-    })()
+        throw new TypeError('Negative numbers are not allowed!');
+      })()
     : n <= 1
-      ? 1
-      : n * factorial(n - 1);
+    ? 1
+    : n * factorial(n - 1);
 ```
 
 <details>
@@ -6703,8 +6704,8 @@ const deepClone = obj => {
   return Array.isArray(obj) && obj.length
     ? (clone.length = obj.length) && Array.from(clone)
     : Array.isArray(obj)
-      ? Array.from(obj)
-      : clone;
+    ? Array.from(obj)
+    : clone;
 };
 ```
 
@@ -6792,13 +6793,13 @@ const deepMapKeys = (obj, f) =>
   Array.isArray(obj)
     ? obj.map(val => deepMapKeys(val, f))
     : typeof obj === 'object'
-      ? Object.keys(obj).reduce((acc, current) => {
+    ? Object.keys(obj).reduce((acc, current) => {
         const val = obj[current];
         acc[f(current)] =
           val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
         return acc;
       }, {})
-      : obj;
+    : obj;
 ```
 
 <details>
@@ -6869,9 +6870,9 @@ const dig = (obj, target) =>
   target in obj
     ? obj[target]
     : Object.values(obj).reduce((acc, val) => {
-      if (acc !== undefined) return acc;
-      if (typeof val === 'object') return dig(val, target);
-    }, undefined);
+        if (acc !== undefined) return acc;
+        if (typeof val === 'object') return dig(val, target);
+      }, undefined);
 ```
 
 <details>
@@ -7127,8 +7128,7 @@ Otherwise, use `Object.keys(obj)` in combination with `Array.prototype.includes(
 const hasKey = (obj, key) => {
   if (key.includes('.')) {
     let _key = key.split('.')[0];
-    if (typeof obj[_key] === 'object')
-      return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));
+    if (typeof obj[_key] === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));
   }
   return Object.keys(obj).includes(key);
 };
@@ -7139,7 +7139,9 @@ const hasKey = (obj, key) => {
 
 ```js
 let obj = {
-  a: 1, b: { c: 4 }, 'd.e': 5
+  a: 1,
+  b: { c: 4 },
+  'd.e': 5
 };
 hasKey(obj, 'a'); // true
 hasKey(obj, 'b'); // true
@@ -9366,6 +9368,36 @@ last(1, 2, 3, 4, 5); // 5
 
 <br>[⬆ Back to top](#contents)
 
+### objectToQueryString
+
+Returns a query string generated from the key-value pairs of the given object.
+
+Use `Array.prototype.reduce()` on `Object.entries(queryParameters)` to create the query string.
+Determine the `symbol` to be either `?` or `&` based on the `index` and 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 = index === 0 ? '?' : '&';
+      queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';
+      return queryString;
+    }, '')
+    : '';
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+objectToQueryString({page: '1', size: '2kg', key: undefined}); // '?page=1&size=2kg'
+```
+</details>
+
+<br>[⬆ Back to top](#contents)
+
 ### parseCookie
 
 Parse an HTTP Cookie header string and return an object of all cookie name-value pairs.