/**
* Runtime Error handling can be done by throw, try..catch..finally
*
*/
//Following type of javascript error objects are already
//EvalError - results from eval() function
//RangeError - results when value is outside valid range
//ReferenceError - results when dereferencing when invalid reference
//SyntaxError - results when syntax error in parsing code
//TypeError - results when variable is of invalid type
//URIError - results when encodeURI(), decodeURI() are passed invalid parameters
//throw syntax
//throw new Error([message])
//throw([message])
//try catch finally demo
var num1=2;
var num2=0;
try{
//code that may throw runtime error
if(num2==0){
throw new SyntaxError("Divide by zero not allowed");//this error will throw error because num2 is ZERO.
}
var result = num1/num2;
console.log("result is ::"+result);//this statement is not executed if previous statement is ERROR.
}catch(e){
//catch block will contain code to handle situation in case of error situation
console.log("Error :",e);
}finally{
//finally will contain block of code which to be executed in any case error or not.
console.log("Code execution is complete");
}
//create custom Error type
function CustomError(message){
this.name ="customError";
this.message = message || "this is custom error";
}
//try catch finally demo
var num1=2;
var num2=0;
try{
//code that may throw runtime error
if(num2==0){
throw new CustomError();//this error will throw error because num2 is ZERO.
}
var result = num1/num2;
console.log("result is ::"+result);//this statement is not executed if previous statement is ERROR.
}catch(e){
//catch block will contain code to handle situation in case of error situation
console.log("Error :",e);
}finally{
//finally will contain block of code which to be executed in any case error or not.
console.log("Code execution is complete");
}
Output
SoftFeeds 