Introduction
Environment Setup
What is JavaScript vs ES-5 or ES-6
JavaScript Syntax
JavaScript Comments
JavaScript Use Strict
JavaScript Variables
JavaScript Reserved Words
JavaScript Scope
JavaScript Data Types
JavaScript Function
Function overloading not possible in JavaScript
JavaScript Arrow Function
JavaScript Numbers
JavaScript Number Methods
JavaScript String
JavaScript String Methods
JavaScript if else and else if
JavaScript Comparison and Logical Operators
JavaScript Arrays
JavaScript Sorting Arrays
JavaScript Array Iteration Methods
JavaScript for loop
JavaScript Let keyword
JavaScript Const
JavaScript Objects
JavaScript Object Methods
JavaScript ES5 Object Methods
JavaScript Object Accessors
JavaScript Math Object
JavaScript Random
JavaScript this Keyword
JavaScript Date Objects and Date Formats
JavaScript Classes
JavaScript While Loop
JavaScript Break and Continue
JavaScript Switch Statement
JavaScript JSON
Error handling in JavaScript
Use try/catch/finally to handle runtime errors in JavaScript. These runtime errors are called exceptions. An exception can occur for a variety of reasons. For example, referencing a variable or a method that is not defined can cause an exception. The JavaScript statements that can possibly causes exceptions should be wrapped inside a try block. When a specific line in try block causes an exception, the control is immediately transferred to the catch block skipping the rest of the code in the try block.
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
try{
console.log(hellow());
console.log("This line will be not executed");
}
catch(e){
console.log(e.message);
}
finally{
console.log("Must the block is executed");
}
</script>
</body>
</html>
When we know the line will occur the error then the lines write under the try block. If the line will error then it throws the error into the catch parameter and print the message. One the other hand finally block code must execute if the occur error or not.
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