mirror of
https://github.com/Start9Labs/start-os.git
synced 2026-03-27 02:41:53 +00:00
d4e019c87b
* add comments to everything potentially consumer facing * rework smtp --------- Co-authored-by: Aiden McClelland <3732071+dr-bonez@users.noreply.github.com>
23 lines
571 B
TypeScript
23 lines
571 B
TypeScript
/**
|
|
* Wraps a function so it is only executed once. Subsequent calls return the cached result.
|
|
*
|
|
* @param fn - The function to execute at most once
|
|
* @returns A wrapper that lazily evaluates `fn` on first call and caches the result
|
|
*
|
|
* @example
|
|
* ```ts
|
|
* const getConfig = once(() => loadExpensiveConfig())
|
|
* getConfig() // loads config
|
|
* getConfig() // returns cached result
|
|
* ```
|
|
*/
|
|
export function once<B>(fn: () => B): () => B {
|
|
let result: [B] | [] = []
|
|
return () => {
|
|
if (!result.length) {
|
|
result = [fn()]
|
|
}
|
|
return result[0]
|
|
}
|
|
}
|