javascript try catch error code example
Example 1: try catch in javascript
try {
// Try to run this code
}
catch(err) {
// if any error, Code throws the error
}
finally {
// Always run this code regardless of error or not
//this block is optional
}
Example 2: javascript try
var someNumber = 1;
try {
someNumber.replace("-",""); //You can't replace a int
} catch(err) {
console.log(err);
}
Example 3: try catch javascript
"The try...catch statement marks a block of statements to try and specifies"
"a response should an exception be thrown."
try {
nonExistentFunction();
} catch (error) {
console.error(error);
// expected output: ReferenceError: nonExistentFunction is not defined
// Note - error messages will vary depending on browser
}
Example 4: javascript try catch
<html>
<head>Exception Handling</head>
<body>
<script>
try {
throw new Error('This is the throw keyword');
}
catch (e) {
document.write(e.message);
}
</script>
</body>
</html>
Example 5: try catch javascript
try {
// code may cause error
} catch(error){
// code to handle error
}
Example 6: try catch error
// Main program passes in two ints, checks for errors / invalid input
// using template class type T for all variables within functions
#include <iostream>
using namespace std;
template <class T> // make function return type template (T)
void getMin(T val1, T val2)
{
try
{
if (val1 < val2) // if val1 less than return it as min
cout << val1 << " is the minimum\n";
else if (val1 > val2)
cout << val2 << " is the minimum\n";
else
throw 505; // exception error processing when input is invalid
}
catch(T my_ERROR_NUM)
{
cout << "Input is invalid, try again. "; // first part of error message
}
}
template <class T>
void getMax(T val1, T val2) // make function return type template (T)
{
try
{
if (val1 > val2) // if val1 greater then return it as max
cout << val1 << " is the maximum\n\n";
else if (val1 < val2)
cout << val2 << " is the maximum\n\n";
else
throw 505; // exception error processing when input is invalid
}
catch (T random_num)
{
cout << "Error 505!\n\n"; // Second part of error messagee
}
}