When the code runs into an unexpected problem, the JavaScript idiomatic way to handle this situation is through exceptions.
An exception is created using the throw keyword:
throw value
where value can be any JavaScript value including a string, a number or an object.
As soon as JavaScript executes this line, the normal program flow is halted and the control is held back to the nearest exception handler.
Example:
const test = (param) => {
if (typeof param !== 'number') {
throw 'The param should be a number!'
}
}
test('test')
Lessons in this unit:
| 0: | Introduction |
| 1: | Types of errors |
| 2: | ▶︎ Creating exceptions |
| 3: | Handling exceptions |
| 4: | Finally |
| 5: | Nested try blocks |
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