CODEWITHSUNDEEP
javascripttypescriptfunctional-programming
Dustin Michels
Dustin Michels

Reputation: 3226

Name for the pattern where a "response" object or tuple is returned

When writing JavaScript/TypeScript, I sometimes implement a pattern where a function returns either a response object (as shown below) or a response "tuple" (just meaning array with two items), rather than the raw value. Something like this:

example.js

function getName() {
  if (userPressedOk) {
    return {status: "OK", name: getName()}
  else {
    return {status: "FAIL", name: ""}
  }
}

example.ts

function getName(): { status: string; jobName: string } {
  if (userPressedOk) {
    return {status: "OK", name: getName()}
  else {
    return {status: "FAIL", name: ""}
  }
}

This is a slightly contrived example, but that's the basic idea. I am trying to imitate I style I have seen in functional programming languages. Does this pattern have a name?

Upvotes: 1

Views: 89

Answers (1)

Bergi
Bergi

Reputation: 664484

I've seen them called Result Objects.

In the functional languages that you say you are borrowing from, the respecitive type is often called Result or Either (although it usually provides an error message in the fail case, not a default value).

Upvotes: 3

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