javascript - what is the most terse way to return an array of entities in typescript? -

i'm trying figure out terse way return array of objects ts function. following function works expected:

    getauthors1(): author[]     {         var authors: author[] =             [                 {             firstname: "john";             mi: "j";                     lastname: "smith";                                     }             ];         return authors;     } 

the following function errors out b/c appears ts won't let me return object array directly opposed variable:

    getauthors2(): author[]     {         return author[] =             [                 {             firstname: "john";               mi: "j";                     lastname: "smith";                                     }             ];     } 

the following function errors out b/c value isn't provided mi:

getauthors3(): author[] {     var authors: author[] =         [             {         firstname: "john";               lastname: "smith";                                 }         ];     return authors; } 

questions:

1. are values required object properties when creating object initialized array? 1a. if case developers typically initialize property values in class?
2. is there way return object array directly, similar getauthors2() example above, opposed having assign variable , return variable?

if have interface defined , create object tell typescript should of type, complain missing property, should.

one way around use mapped type state each property of object optional, , use partial< author >. see official documentation more info.

you can return array right away, remove type you've added after return:

getauthors2(): author[] {     return [       {         firstname: 'john',         mi: 'j',         lastname: 'smith',       }     ];   } 

also wherever possible should remove manually defined types, return author[] functions. typescript use type inference figure out itself.

in specific example either leave return type defined, , typescript make required checks or use similar have in getauthors3. if or have objects typed place them in array , typescript rest:

getauthors() {     const author: author = {         firstname: 'john',         mi: 'j',         lastname: 'smith',     };     return [author];   }