When mapping an array of strings, getting undefined

Asked Nov 28 '21 at 18:31

Active Nov 28 '21 at 18:31

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How do I map an array of strings to be an array of JSON objects? I have tried the below in the console

>> entityTypes = ["library"]
Array [ "library" ]

>> entityTypes.map(type => {name: type});
Array [ undefined ]

The resulting array is undefined. I can hard-code things and they look fine

>> arr = [{name: "library"}]
Array [ {…} ]

So not sure what's going wrong with my map function.

asked Nov 28 '21 at 18:31

Dave

1

you need to assign the return value of the map to a variable. – The Fool Nov 28 '21 at 18:34
1

Do this `entityTypes.map(type => ({name: type}))` add `()` around `{name: type}` – evgeni fotia Nov 28 '21 at 18:36
@TheFool This is in a REPL context, so that isn’t necessary to see the results of the expressions. – Sebastian Simon Nov 28 '21 at 18:36
Real JSON object the name in double quotes. – Poul Bak Nov 28 '21 at 18:37
@evgenifotia, good catch. Thats the issue. Its a function body that diesnt return anything so undefined by default. – The Fool Nov 28 '21 at 18:40

0 Answers0