NativeScript Typescript: JSON Array to Typescript Typed Array

Question

I need your help, I'm learning NativeScript, here I read the txt file which has JSON data below output. After I fetch them I want to assign it to Array countries. But no luck :(

public countries: Array

console.log(response)

console.log(JSON.parse(JSON.stringify(response)))

Output:

[ { "name": "Afghanistan", "code": "AF" }, { "name": "Albania", "code": "AL" } ]

Please help. Regards,

mcrvaz · Accepted Answer · 2017-05-12 03:15:22Z

2

This is an Array<any>:

[ { "name": "Afghanistan", "code": "AF" }, { "name": "Albania", "code": "AL" } ]

You need to convert it to a Array<Country>, Example:

result.forEach((e) => { countries.push(new Country(e.name, e.code))

That, or you can change the return of the function that reads the txt to Array<Country>

answered May 12, 2017 at 3:15

mcrvaz

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1 Comment

SAM Over a year ago

Thanks buddy, surprisingly foreach was given error finally solved as above.

SAM · Accepted Answer · 2017-05-12 09:33:06Z

1

finally got it via below code...

                    let elements: Array<Country> = JSON.parse(JSON.stringify(response))
                    .map((item:Country) => 
                    {
                        console.log(item.name +  ' < - >' + item.code);
                    })

Thanks All :)

answered May 12, 2017 at 9:33

SAM

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2 Comments

ittradco Over a year ago

That is working fine in one condition the JSON OUTPUT elements labels, in this case: name and code [ { "name": "Afghanistan", "code": "AF" }, { "name": "Albania", "code": "AL" } ] TO BE THE SAME like the object, in this case Country, properties names

ittradco Over a year ago

One more thing, do you try to print-out the elements array variable, console.log(elements)? In my case the result was: [undefined, undefined]. Any clue why?

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