Consider the following Scala code: def f(collection: List[Int], init_acc: Int):

Question

Consider the following Scala code: def f(collection: List[Int], init_acc: Int): Int = {____ .foldLeft (_______) {(acc, ___________) Rightarrow//work which updates the value of _____ in the next iteration, often based on the current value of both acc and ci}} The following pseudo code represents a similar concept acc = ______ for (_______ in-left-to-right _______) {//work which updates the value of _____ in the next iteration, often based on the current value of both acc and ci} Suppose instead we want the analogous pseudo code for foldRight acc = _______ for (_______ __________ _________) {//work which updates the value of _______ in the next iteration, often based on the current value of both acc and ci}

Explanation / Answer

Solution for Part 1:

def f(collection: List[int], init_acc: Int = { List.foldLeft(0){(acc,ci)=>acc+ci) } }

Solution for Part 2(Pseudo code):

acc = init_acc
for(acc in-left-to-right ci ){
collection = acc+ci
}

Solution for Part 3(Pseudo code):

acc = init_acc
for(ci in-right-to-left acc ){
   collection = acc+ci
}

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