object constructor list in Node.js

Question

I recently started learning Node.js and I want to know how to let a function accept multiple strings in the form of an array. For example,

export default (config: Config) => {
  return {
    target: 'https://google.com',
    endpoint: null,
    tick: 500,
    verbose: true,
    once: false,
    }
}

So instead of target: "https://google.com", I'd like something like target: ['https://google.com', 'https://facebook.com']. There's probably something I'm missing but I'm a bit lost on how to do this.

1565986223 · Accepted Answer · 2019-03-25 03:42:14Z

You can use rest parameters. The syntax is

 const hello = (...args) => {
     // args is now an array
     console.log(args)
 }

Then you can use it like so:

hello('This ', 'is ', 'an ', 'example') // outputs ['This ', 'is ', 'an ', 'example']

You can pass any number of arguments in it.

So back to your example, you could have some like

const example = (...targets) => {
  return {
    target: targets,
    endpoint: null,
    tick: 500,
    verbose: true,
    once: false,
  }
}

module.exports = example

And you can use it like so

const example = require('./example')

let val = example('google', 'twitter', 'yahoo')
console.log(val)

Rest parameter should be the last parameter in your function. So if you want to pass some other params, the syntax is

function hello(param, ...rest) {
    // rest is an array
    ...
}

You could also directly pass an array or a variable referencing an array:

function hello(param) {
    ...
    console.log(param)
}

hello(["hello", "world"]) // outputs ["hello", "world"]
or
var arr = ["hello", "world"]
hello(arr)

You can also read more about the Array-like object arguments here

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