having a problem with this piece of javascript code

Question

Let's suppose actions is defined but how do I access this first and second boolean inside someFunction?

is this an object or some kind of destructuring? cause I am getting a some kind of destructuring error.

function someFunction(actions, { first = true, second= false }) {      
    if(first == true) {
      console.log("something");
    }
}

Error i get -

TypeError: Cannot read property 'first ' of undefined

If you're getting an error then you should always include it in your question. — jarmod
– jarmod, Commented Sep 9, 2020 at 15:44
@TimLewis this was the code i given and I have to do it that way. — Almuntasir Abir
– Almuntasir Abir, Commented Sep 9, 2020 at 15:46
That's fine, but if the code you were given is not working, you can't really do it that way can you :) Anyway, you've been asked to include the error you're getting, so please update you question with that information. — Tim Lewis
– Tim Lewis, Commented Sep 9, 2020 at 15:47

Stephen P · Accepted Answer · 2020-09-09 15:56:06Z

1

For that to work you have to pass a second parameter when you call the function.
The second argument will be destructured; delayedActions("foo", "bar") will work, but delayedActions("foo", {}) makes more sense.

You can override the default value of recursive:
delayedActions("foo", { recursive:false })

The object parameter can include other things not in the function signature object:
delayedActions("foo", { recursive:true, errorExit:true, fooParam:'bar' })

Without a second parameter you get an error such as
VM48976:1 Uncaught TypeError: Cannot read property 'recursive' of undefined

edited Sep 9, 2020 at 15:56

answered Sep 9, 2020 at 15:48

Stephen P

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2 Comments

Almuntasir Abir Over a year ago

Wow, I get exactly that error. thank you so much. Is that just an object? I thought it was default parameter.

Stephen P Over a year ago

@AlmuntasirAbir well it is a default parameter but it is an unnamed default parameter. A default parameter would usually have a name... function delayedActions(actions, config = { recursive = true, errorExit = false }) but that doesn't work with an object param, saying "Invalid shorthand property initializer" — but that may be something I don't understand.

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