Errors and Error Handling
Polylang provides error-handling support via the error built-in function.
The syntax for error is:
error('error message goes here');We can also prepend the error built-in with a throw. So the following is identical:
throw error('error message goes here');The semantics is to abort the function call immediately with the given error message.
Example:
contract Person {
id: string;
name: string;
age: number;
hasVoted: boolean;
constructor (id: string, name: string, age: number) {
this.id = id;
this.name = name;
this.age = age;
this.canVote = false;
}
setName(newName: string) {
this.name = newName;
}
setAge(newAge: number) {
this.age = newAge;
}
vote() {
if (this.age < 18) {
// fail this call immediately
error('Cannot vote till 18');
}
this.hasVoted = true;
}
}