catch-match

catch-match

Motivation

java

try {
    ...
} catch (ExceptionClass1 e) {
   ....
} catch (ExceptionClass2, ExceptionClass3 e) {
   ....
} catch (any) {
  ...
} finally {
  ....
}

javascript

try {
  error; // error intruction
} catch (err) {
  switch(err.constructor) {
    case ReferenceError:
    case SyntaxError:
      console.error(`${err.constructor.name}: ${err.message}`);
      break;
    default:
      console.error('other error:', err);
  }
} finally {
  console.log('final')
}

//> ReferenceError: error is not defined
//> final

Getting started

yarn add catch-match

or 

npm install catch-match

import $try from 'catch-match';
// or
import { $try } from 'catch-match';

Example 1

const result = $try(() => {
  throw SyntaxError;
}).catch(ReferenceError, () => {
  // noop
}).catch([TypeError, SyntaxError], () => {
  // to be called
}).other((error) => {
  // noop
}).finally(({ result, error }) => {
  return result;
});

console.log(result); // { error: SyntaxError, result: undefined }

Example 2

const result = $try(() => {
  return [1, 2, 3];
}).catch(ReferenceError, () => {
  // noop
}).catch([TypeError, SyntaxError], () => {
  // to be called
}).other((error) => {
  // noop
}).finally(({ result, error }) => {
  return result;
});

console.log(result); // {error: undefined, result: [1, 2, 3]}

Example 3

const result = $try(context => {
  context.tmp = 'any context data';
  console.log('start', context);
  // ...
  throw SyntaxError;
}).catch([TypeError, ReferenceError], (context) => {
  // noop
}).other((error, context) => {
  // error: SyntaxError
  // context: {tmp: 'any context data'}
  context.unexpectedError = true;
}).finally(({value, context, error}) => {
  // value: undefined 
  // context: {tmp: 'any context data', unexpectedError: true}
  // error: SyntaxError
  if (!error) {
    return value.reverse();
  }
});

console.log(result);
// {
//     value: undefined 
//     context: {tmp: 'any context data', unexpectedError: true}
//     error: SyntaxError
// }