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fold

abstract fun <R> fold(
    initial: R, 
    operation: (R, Element) -> R
): R

Accumulates entries of this context starting with initial value and applying operation from left to right to current accumulator value and each element of this context.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/-coroutine-context/fold.html