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switch-box's Introduction

Extendable pattern matching library for typescript

Synchronous match

  • only first successful case would be ran, others would be skipped
  • use only synchronous matching functions, otherwise more then one case could be ran
  • default should be the last method in chain, otherwise only it would be ran
import { match } from 'switch-box';

match(42)
.case<number>(
  (value, matcher) => {matcher(typeof value === 'number')},
  value => console.info('this is number')
)
.case<string>(
  (value, matcher) => {matcher(typeof value === 'string')},
  value => console.info('this is string')
)
.default(
  value => console.info(`this is ${typeof value}`)
);

Asynchronous match

  • match functions could be asynchronous
  • cases would be run one after another until successful case
  • it could be only one successful case, first would be ran, others would be skipped
import { matchAsync } from 'switch-box';

matchAsync(42)
.case<number>(
  (value, matcher) => {
    setTimeout(() => {
      matcher(typeof value === 'number');
    }, 160);
  },
  value => console.info('this is number')
)
.case<string>(
  (value, matcher) => {
    setTimeout(() => {
      matcher(typeof value === 'string');
    }, 160);
  },
  value => console.info('this is string')
)
;

JS

Library is developed for typescript projects specifically, but if you want to use it with JS just npm run compile

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