Enhancing an identity function with type hinting

Question

Enhancing an identity function with type hinting

I am looking to define a specification for a function that returns its input argument, regardless of its type. The crucial aspect here is to mirror the interface of the argument in the return value.

For instance, when I type z. on line 6 as shown in the image below, I expect the code editor to provide auto-completion options, with a being one of them.

https://i.sstatic.net/tyzVq.png

How can I specify this in JSDoc?

Given that TypeScript's inference does not cover this scenario, I am using VS Code and working with vanilla JavaScript. How can I achieve this using JSDoc?

function returnMe(x) {
  return x
}

const z = returnMe({a:2})
z. // 👈 here I want to get auto completion

javascript jsdoc

Answer 1

Answer №1

Is this the solution you are looking for? Found at https://example.com.

/**
 * @template T
 * @param {T} input
 * @returns {T}
 */
function identity(input) {
  return input;
}

Answer 2

Is this the solution you are looking for? Found at https://example.com.

/**
 * @template T
 * @param {T} input
 * @returns {T}
 */
function identity(input) {
  return input;
}

Answer 3

Answer №2

While doing some research on Wikipedia, I stumbled upon an interesting concept known as the identity function in programming. This function simply returns its arguments.

To implement an identity function, you can define a @template + @param + @returns like this:

/** 
  @template IdentityB
  @param {IdentityB} y
  @returns {IdentityB}
*/
function keepMe(y) {
  return y
}

const w = keepMe({
  b: 5
})
w. // 🌟 Enjoy type warnings and auto completion features! 😁

Answer 4

While doing some research on Wikipedia, I stumbled upon an interesting concept known as the identity function in programming. This function simply returns its arguments.

To implement an identity function, you can define a @template + @param + @returns like this:

/** 
  @template IdentityB
  @param {IdentityB} y
  @returns {IdentityB}
*/
function keepMe(y) {
  return y
}

const w = keepMe({
  b: 5
})
w. // 🌟 Enjoy type warnings and auto completion features! 😁

Enhancing an identity function with type hinting

Answer №1

Answer №2

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