fix(guide): simplify directory structure

guide/english/javascript/standard-objects/string/string-length/index.md

@@ -0,0 +1,45 @@
+---
+title: String Length
+---
+The `length` property represents the length of a string.
+
+## Syntax
+
+    str.length
+
+<a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length' target='_blank' rel='nofollow'>MDN link</a> | <a href='https://msdn.microsoft.com/en-us/LIBRary/3d616214%28v=vs.94%29.aspx' target='_blank' rel='nofollow'>MSDN link</a>
+
+## Description
+
+This property returns the number of code units in the string. UTF-16, the string format used by JavaScript, uses a single 16-bit code unit to represent the most common characters, but needs to use two code units for less commonly-used characters, so it's possible for the value returned by length to not match the actual number of characters in the string.
+
+For an empty string, length is 0.
+
+The static property `String.length` returns the value 1.
+
+## Examples
+
+    var x = 'Mozilla';
+    var empty = '';
+
+    console.log('Mozilla is ' + x.length + ' code units long');
+    /* "Mozilla is 7 code units long" */
+
+    console.log('The empty string has a length of ' + empty.length);
+    /* "The empty string has a length of 0" */
+
+    var str = "every good boy does fine";
+            var start = 0;
+            var end = str.length - 1;
+            var tmp = "";
+            var arr = new Array(end);
+
+            while (end >= 0) {
+                arr[start++] = str.charAt(end--);
+            }
+
+    // Join the elements of the array with a 
+            var str2 = arr.join('');
+            document.write(str2);
+
+    // Output: enif seod yob doog yreve