@gopher.js/defer

Defer is a wrapper for your functions that tried to implement a similar way to defer keyword in go.

Installation

with npm

npm install @gopher.js/defer

with yarn

yarn add @gopher.js/defer

Usage

Defer comes with 2 wrapper functions:

• withDefer
• withDeferAsync

Every time you call defer, the function passed is added to a stack. After the wrapper function completes, the wrapper starts popping the stack functions and calling them in the reverse order they were inserted.

With Defer

const { withDefer } = require('@gopher.js/defer')

const result = withDefer((defer) => {
  defer(function() {console.log("this will print third")})
  defer(function() {console.log("this will print second")})
  console.log("I will print before all others")
  return 1 + 2;
})
console.log("This will print at the end. Result:", result)

With Defer Async

const { withDeferAsync } = require('@gopher.js/defer')

// inside an async function
const result = await withDeferAsync(async (defer) => {
  defer(() => new Promise((resolve) => {
    console.log("this will print third")
    resolve();
  }))
  defer(() => new Promise((resolve) => {
    console.log("this will print second")
    resolve();
  }))
  console.log("I will print before all others")
  return 1 + 2;
})
console.log("This will print at the end. Result:", result)

What if a promise rejects?

The function will throw an error