Add JavaScript switch statement (#1822)

* Update 101-switch.md

* Update content/roadmaps/106-javascript/content/107-javascript-control-flow/101-conditional-statements/101-switch.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/107-javascript-control-flow/101-conditional-statements/101-switch.md

@@ -1 +1,25 @@
-# Switch
+# Switch
+
+The `switch` statement evaluates an expression, matching the expression's value against a series of `case` clauses, and executes statements after the first `case` clause with a matching value, until a `break` statement is encountered. The `default` clause of a `switch` statement will be jumped to if no `case` matches the expression's value.
+
+```
+switch (expression) {
+  case value1:
+    //Statements executed when the result of expression matches value1
+    break; 
+  case value2:
+    //Statements executed when the result of expression matches value2
+    break; 
+  ...
+  case valueN:
+    //Statements executed when the result of expression matches valueN
+    break; 
+  default:
+    //Statements executed when none of the values match the value of the expression
+    break; 
+} 
+```
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch'>switch - MDN</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Read' href='https://javascript.info/switch'>The switch statement</BadgeLink>