How can I map a list to a list of JSON?

Question

I try to cast a list of strings [x, y, z] to a list of JSON-objects [{str:x},{str:y},{str:z}].

Thats my try, but I get an error.

let lst:string [] = ["a", "b", "c"];

let foo:any [] = lst.map (l => {"str": l});

Error

error TS1005: ';' expected.
  let foo:any [] = lst.map (l => {"str": l});
                                       ~

Does this answer your question? [ECMAScript 6 arrow function that returns an object](https://stackoverflow.com/questions/28770415/ecmascript-6-arrow-function-that-returns-an-object) — jonrsharpe, Aug 26 '23 at 08:47

score 1 · Answer 1 · answered Aug 26 '23 at 08:39

1

You syntax would not work with Javascript either

You want

const foo:({ str: string })[] = lst.map (l => ({"str": l}));

You need to escape the {} that looks like a function body, and make Javascript think it is dealing with an object

answered Aug 26 '23 at 08:39

Aron

score 0 · Accepted Answer · answered Aug 26 '23 at 08:40

0

While returing you need to use brackets(). Because we are inside a loop {} will be treated as block. So the updated code will be,

let lst: string[] = ["a", "b", "c"];

let foo: any[] = lst.map(l => ({ "str": l }));

Note ({"str": l})

answered Aug 26 '23 at 08:40

2 Answers2