//arrow-core/arrow.core/memoize

memoize

common fun <R> () -> R.memoize(): () -> R

Memoizes the given pure function so that invocations with the same arguments will only execute the function once.

import arrow.core.memoize
fun someWorkIntensiveFunction(someParam: Int): String = "$someParam"

fun main() {
  //sampleStart
  val memoizedF = ::someWorkIntensiveFunction.memoize()

  // The first invocation will store the argument and result in a cache inside the `memoizedF` reference.
  val value1 = memoizedF(42)
  // This second invocation won't really call the `someWorkIntensiveFunction` function
  //but retrieve the result from the previous invocation instead.
  val value2 = memoizedF(42)

  //sampleEnd
  println("$value1 $value2")
}

Note that calling this function with the same parameters in parallel might cause the function to be executed twice.

common fun <P1, R> (P1) -> R.memoize(): (P1) -> R

fun <P1, P2, R> (P1, P2) -> R.memoize(): (P1, P2) -> R

fun <P1, P2, P3, R> (P1, P2, P3) -> R.memoize(): (P1, P2, P3) -> R

fun <P1, P2, P3, P4, R> (P1, P2, P3, P4) -> R.memoize(): (P1, P2, P3, P4) -> R

fun <P1, P2, P3, P4, P5, R> (P1, P2, P3, P4, P5) -> R.memoize(): (P1, P2, P3, P4, P5) -> R

See also

common

   
memoize  

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