Merge pull request learning-zone#4 from NegiAkash890/master

Updated Question Section

Author: learning-zone

README.md

@@ -348,6 +348,8 @@
 | 349.|[Explain types of Memory Leaks in JavaScript?](#q-explain-types-of-memory-leaks-in-javascript)|
 | 350.|[How accidental closures might cause memory leaks in IE?](#q-how-accidental-closures-might-cause-memory-leaks-in-ie)|
 | 351.|[How to convert Decimal to Binary in JavaScript?](#q-how-to-convert-decimal-to-binary-in-javascript)|
+| 352.|[How setTimeout() and setInterval() are different from each other ?](#q-how-setTimeout()-and-setInterval()-are-different-from-each-other)|
+
 
 <br/>
 
@@ -8741,3 +8743,44 @@ console.log(val.toString(16)); // A  ==> Hexadecimal Conversion
 <div align="right">
     <b><a href="#">↥ back to top</a></b>
 </div>
+
+## 335Q. ***How setTimeout() and setInterval() are different from each other ?***
+
+```javascript
+//Syntax for setTimeout
+
+function displayMessage() {
+    console.log('This message will be displayed only once after 4s!') ;
+}
+
+setTimeout(displayMessage, 4000);
+ 
+```
+
+```javascript
+//Syntax for setInterval
+
+function displayMessage(){
+    console.log('This message will be displayed after every 4s!') ;
+}
+
+setInterval(displayMessage, 4000) ;
+
+```
+
+Usage : setTimeout( function/expression, timeout, param1, param2, ... ) ;
+
+where expression/function is the JavaScript code to run after the timeout milliseconds have elapsed. The params are optional.
+
+Usage : setInterval ( function/expression, interval, param1, param2, ... );
+
+where expression/function is the  JavaScript code to run  repeatedly at specified interval of time has elpased . 
+
+Main Difference
+
+When you need to invoke a function/expression once after a specified duration use setTimeout() function. 
+But, if you need to invoke a function/expression repeatedly at a specified interval of time, then you should use setInterval() function.
+
+<div align="right">
+    <b><a href="#">↥ back to top</a></b>
+</div>