Learning Java Script from Java Point of View
June 06, 2020
Writing a program
Let’s write a simple java program
Math.java
public static class Math{
public static int sum (int a, int b){
return a+b;
}
}Writing the same program in javascript
Math.js
const sum = (a, b) => {
return a + b
}Executing the program
To execute the java program you need a Java Application and JVM. A java application is a class that has main method in it. Let’s write a java application to use our program.
App.java
public class App{
public static void main(String[] args]){
int val = Math.sum(5,7);
System.out.println("Sum is:" + val);
}
}After writing the program you need to compile and run the java application App.java.
To execute the java script program you need a html which loads the script file in the Browser and its java script engine Please read the above statement with a grain of salt. There are other ways of executing javascript.
In order to load java script on the browser, let’s create an HTML.
index.html
<html>
<head>
<script src="Math.js"></script>
<script>
var val = sum(5, 7)
console.log(val)
</script>
</head>
</html>JVM and Java Script Engines
- IBM J9
- HotSpot
- V8
- SpiderMonkey
Writing Tests
- JUnit Test
- Test NG
- Jest
- Karma