Using replace values between two json objects with rxjs in angular

Question

I want to use Rxjs map() method to switch values between two json objects. Or if there are any better rxjs methods I am open to suggestions

For example if I have two json objects:

[{"firstname":"abc","lastname":"bcd"},{"firstname":"xyz","lastname":"zzz"}]

How do I for example switch the values of first name from both json objects in the array as well as the lastnames? I am very new to rxjs!

Thanks!

Does your Observable emit {"firstname":"abc","lastname":"bcd"}, then {"firstname":"abc","lastname":"bcd"}, or does it emit [{"firstname":"abc","lastname":"bcd"},{"firstname":"xyz","lastname":"zzz"}] all at once? — hugo
– hugo, Commented Aug 1, 2019 at 13:57
what is the desire output? switch both the firstname and the lastname? — Bill Cheng
– Bill Cheng, Commented Aug 1, 2019 at 14:12

hugo · Accepted Answer · 2019-08-01 14:31:28Z

0

In your example, swapping the entire objects will work:

let swapped = observable.pipe(map(([first, second]) => [second, first]));

In older versions of JS (and made a bit verbose on purpose):

function swapPair(arr) {
    var first = arr[0];
    var second = arr[1];
    return [second, first];
}

var swapped = observable.pipe(map(swapPair));

If you want a more generic way to swap properties -- I was about to write something, but really it's been done before:

answered Aug 1, 2019 at 14:31

hugo

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