Add JS Block Article

JS-Block.md

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+# JavaScript Block
+
+## Introduction
+
+In computer programming, a **block** or code **block** is a section of code which is grouped together. Blocks consist of one or more declarations and statements. A programming language that permits the creation of blocks, including blocks nested within other blocks, is called a block-structured programming language. JavaScript is one such programming language.
+
+A **block** statement in JavaScript is used to group zero or more statements. The block is delimited by a pair of curly brackets.
+
+```javascript
+{
+  statement_1;
+  statement_2;
+  ...
+  statement_n;
+}
+```
+
+[MDN link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/block)
+
+## Examples
+
+The **block** statement is commonly used with control flow statements (e.g. `if...else`, `for`, `while`) and functions.
+
+```javascript
+while (x < 10) {
+  x++;
+}
+```
+
+```javascript
+function addnums(num1, num2) {
+  var sum = 0;
+  sum = num1 + num2;
+  return sum;
+}
+```