Merge 0367462d4d into 8557d4f3d8

adding the at() method

languages/javascript.js

@@ -72,6 +72,7 @@ array.splice(start, deleteCount, item1, item2, ...)  // Adds and/or removes elem
 arr.unshift([element1[, ...[, elementN]]])           // Adds one or more elements to the front of an array and returns the new length of the array.
 
 // Instance: accessor methods
+arr.at(index)                                        // Returns the element at the specified index in the array.
 arr.concat(value1[, value2[, ...[, valueN]]])        // Returns a new array comprised of this array joined with other array(s) and/or value(s).
 arr.includes(searchElement, fromIndex)               // Determines whether an array contains a certain element, returning true or false as appropriate.
 arr.indexOf(searchElement[, fromIndex])              // Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found.

tools/markdown.md

@@ -0,0 +1,146 @@
+<!-- ----------- Markdown Cheat sheet -----------------------------------------
+
+Markdown is a lightweight markup language for creating formatted text 
+using a plain-text editor. John Gruber created Markdown in 2004 as a markup 
+language that is appealing to human readers in its source code form. Markdown 
+is widely used in blogging, instant messaging, online forums, collaborative 
+software, documentation pages, and readme files. 
+------------------------------------------------------------------------------->
+
+<!-- Headings  -->
+
+<!-- To create a heading, add number signs (#) in front of a word or phrase. The number of 
+number signs you use should correspond to the heading level. -->
+
+<!-- Example:  -->
+### The Nile River is the largest river in the world.
+
+ 
+| Explanation                  | Syntax                                |
+| ---                          | ---                                   |
+|  Heading level 1             | # Example of heading level 1          |
+|  Heading level 2             | ## Example of heading level 2         |
+|  Heading level 3             | ### Example of heading level 3        |
+|  Heading level 4             | #### Example of heading level 4       |
+|  Heading level 5             | ##### Example of heading level 5      |
+|  Heading level 6             | ###### Example of heading level 6     |
+
+
+<!---------------------------------------------------------------------->
+
+
+<!-- Paragraphs -->
+
+<!-- To create paragraphs, use a blank line to separate one or more lines of text. -->
+
+
+| Markdown                     | HTML                            |
+| ---                          | ---                             |
+|  Example of Paragraph        | <p> Example of Paragraph </p>   |
+
+
+<!---------------------------------------------------------------------->
+
+<!-- Bold and Italic text -->
+
+<!-- To bold text, add two asterisks or underscores before and after a word or phrase. To bold 
+the middle of a word for emphasis, add two asterisks without spaces around the letters.
+
+To italicize text, add one asterisk or underscore before and after a word or phrase. To italicize 
+the middle of a word for emphasis, add one asterisk without spaces around the letters.  -->
+
+
+| Bold text                                        | Italic text                                 |
+| ---                                              | ---                                         |
+|  **Javascript** is popular programming language  |*Javascript* is popular programming language |
+
+
+<!---------------------------------------------------------------------->
+
+<!-- Blockquotes and Nested Blockquotes -->
+
+<!-- To create a blockquote, add a > in front of a paragraph. -->
+
+> The Nile River is the largest river in the world.
+
+<!-- Blockquotes can be nested. Add a >> in front of the paragraph you want to nest. -->
+
+>> The Mount Everest is the highest mountain in the world.
+
+
+
+| Blockquote                       | Nested Blockquote               |
+| ---                              | ---                             |
+|  > This is a blockquote          | >> This is a nested blockquote  |
+
+
+<!---------------------------------------------------------------------->
+
+<!-- Ordered Lists and Unordered Lists -->
+
+<!-- You can organize items into ordered and unordered lists. -->
+
+
+<!-- Example of Ordered Lists -->
+1. First item
+2. Second item
+3. Third item
+    1. Indented item
+    2. Indented item
+4. Fourth item
+
+
+<!-- Example of Unordered Lists -->
+- First item
+- Second item
+- Third item
+    - Indented item
+    - Indented item
+- Fourth item 
+
+<!---------------------------------------------------------------------->
+
+<!-- Code -->
+
+<!-- To denote a word or phrase as code, enclose it in backticks (`). -->
+
+<!-- Example -->
+The `pwd` command writes to standard output the full path name of your current directory
+
+
+<!---------------------------------------------------------------------->
+
+<!-- Horizontal Rules -->
+
+<!-- To create a horizontal rule, use three or more asterisks (***), dashes (---), or 
+    underscores (___) on a line by themselves. -->
+
+
+<!-- Example -->
+
+**********
+----------
+__________
+
+
+<!---------------------------------------------------------------------->
+
+<!-- Links -->
+
+<!-- To create a link, enclose the link text in brackets and then follow it immediately with the URL in parentheses -->
+
+<!-- Example -->
+
+[Wikipedia](https://wikipedia.com) is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
+
+<!---------------------------------------------------------------------->
+
+<!-- Images -->
+
+<!-- To add an image, add an exclamation mark (!), followed by alt text in brackets, and the path or 
+URL to the image asset in parentheses. You can optionally add a title in quotation marks after the path or URL. -->
+
+
+![Markdown Logo](markdown.png "Markdown")
+
+