idempotent

Higher-order function that ensures the original function is only executed once. Subsequent calls return the result of the first call.

Usage

import { idempotent } from '@preflower/utils'

const expensiveTask = (id: number) => {
  console.log('Task executed for', id)
  return id * 2
}

const memoizedTask = idempotent(expensiveTask)

memoizedTask(10) // Logs: Task executed for 10. Returns: 20
memoizedTask(10) // No log. Returns: 20
memoizedTask(20) // No log. Returns: 20 (still returns the result of the FIRST call)

Parameters

Name	Type	Description
action	T extends AnyFunction	The function to be made idempotent.

Returns

• A new function with the same signature that always returns the same result after the first call.