@gxyz/util.func v0.1.1

@gxyz/util.func

@gxyz/util.func is a lightweight utility library for easy use of (returns) functions.

Installation

Install the module locally via your favorite npm client, like npm:

npm install @gxyz/util.func

or yarn:

yarn add @gxyz/util.func

Usage

const {compose, tryCatch,} = require('@gxyz/util.func');

compose(…functions)

Compose async funcs. Take a look at the MDN Web Docs - Using Promises - Composition.

Compose takes an arguments object of async funcs or promises or an array of async funcs or promises.

Compose returns a function, arguments object passed to this function will be used as arguments object of the first element of …functions.

Compose returned func returns an object as promise:

• If all …functions are fulfilled, returned obj will have a value prop with the reduced value.
• If any of …functions is rejected, returned obj will have a reason prop with err.

async function dealAsyncFuncs(...args) {
  const {reason, value,} = await compose(func0, func1, func2)(...args);

  if (reason instanceof Error) {
    throw reason;
  }

  return value;
}

tryCatch(func)

Better manage errors within async funcs.

tryCatch takes an async func or a promise as arg.

tryCatch returns a function, arguments object passed to this function will be used as argument object to func.

tryCatch returned func returns an object as promise:

• If func is fulfilled, returned obj will have a value prop with returned value.
• If func is rejected, returned obj will have a reason prop with err.

async function dealAsyncFunc(...args) {
  const {reason, value,} = await tryCatch(func)(...args);

  if (reason instanceof Error) {
    throw reason;
  }

  return value;
}

Credits

Aziz Da

License

Unlicense