MaryamZi

import ballerina/io;

const MY_REASON = "MyReason";

type MyDetail record {|
    string message;
    error cause?;
    int code?;
    boolean|float...;
|};

MaryamZi

import ballerina/io;

const MY_REASON = "MyReason";

type MyDetail record {|
    string message;
    error cause?;
    int code?;
    anydata|error...;
|};

MaryamZi

import ballerina/io;

function foo() returns error? {
    return error("ErrReason", message = "err message", code = 123, bar = 45.6, baz = false);
}

public function main() {
    error? res = foo();

    if res is error {

MaryamZi

import ballerina/io;

const MY_REASON = "MyReason";

type MyDetail record {|
    string message;
    error cause?;
    int code?;
    anydata|error...;
|};

MaryamZi

import ballerina/io;

function foo() returns error? {
    return error("ErrReason", message = "err message", code = 123);
}

public function main() {
    // Say I call a function returning either an `error` or `()`.
    error? res = foo();

MaryamZi

import ballerina/io;

const REASON = "ErrorReason";

type Detail record {|
    string message;
    error cause?;
    int code;
|};

MaryamZi

public function main() {
    error err = error("TestError", 
                      message = "error message",
                      code = 1111);

    record {|
        string message?;
        error cause?;
        anydata|error...;
    |} detail = err.detail();

MaryamZi

import ballerina/log;

const ERR_REASON_FILE_NOT_FOUND = "FileNotFound";
const ERR_REASON_INSUFFICIENT_PERMISSION = "InsufficientPermission";

// The detail type for `FileNotFoundError` defaults to the default detail type now.
type FileNotFoundError error<ERR_REASON_FILE_NOT_FOUND>;

type ErrDetail record {|
    string message?;

MaryamZi

import ballerina/io;

public function main() {
    xmlns "http://abc.def";

    xml x = xml `<hello foo="bar">
                    <ns1:world xmlns:ns1="http://qwe.asd" xyz="pqr">hello world</ns1:world>
                 </hello>`;

    io:println(x);

MaryamZi

import ballerina/io;

public function main() {
    // If `foo()` does not panic, x will hold 
    // the value returned by `foo()`
    int|string|error x = foo(1);
    io:println(x);

    // If `foo()` panics, x will hold 
    // the error associated with the panic.