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# Processing a tree in F# using continuations

By : Summer Kang
Date : November 22 2020, 10:33 AM
I hope this helps . I think Christian's answer is a good one - continuation passing style is really just a (not so) simple mechanical transformation that you do on the original source code. This might be easier to see when you do it step by step:
1) Start with the original code (here, I change the code to only do one operation per line):
code :
let rec sumTree tree =
match tree with
| Leaf(n) -> n
| Node(left, right) ->
let leftSum = sumTree left
let rightSum = sumTree right
leftSum + rightSum
let rec sumTree tree cont =
match tree with
| Leaf(n) -> cont n
| Node(left, right) ->
let leftSum = sumTree left (fun x -> x)
let rightSum = sumTree right (fun x -> x)
cont (leftSum + rightSum)
let rec sumTree tree cont =
match tree with
| Leaf(n) -> cont n
| Node(left, right) ->
sumTree left (fun leftSum ->
let rightSum = sumTree right (fun x -> x)
cont (leftSum + rightSum) )
let rec sumTree tree cont =
match tree with
| Leaf(n) -> cont n
| Node(left, right) ->
sumTree left (fun leftSum ->
sumTree right (fun rightSum ->
cont (leftSum + rightSum) ))

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## What are "Jetty 6 Continuations" and how do they compare to the continuations found in programming languages?

By : Erros Syahputra
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further
how do they compare to the continuations found in programming languages?

## Assign a value to a node in the tree I'm processing

By : Michael Tang
Date : March 29 2020, 07:55 AM
should help you out Using XSLT 1.0, I want to process four node sets, in order, A, B, C, D. But I can't specify each node set with a single (or at least not manageable) XPath expression. , Solution: Use Global Variables, like this:
code :
<xsl:variable name="A" select="//tei:teiHeader/tei:fileDesc/tei:titleStmt/tei:title" />
<xsl:variable name="B" select="//tei:teiHeader/tei:fileDesc/tei:titleStmt/tei:author" />
<xsl:variable name="D" select="//tei:teiHeader/tei:fileDesc/tei:notesStmt/tei:note" />
<xsl:with-param name="rowitems" select="\$A" />
</xsl:call-template>
<xsl:with-param name="rowitems" select="\$B" />
</xsl:call-template>
<xsl:with-param name="rowitems" select="\$C" />
</xsl:call-template>
<xsl:with-param name="rowitems" select="\$D" />
</xsl:call-template>

## Is there something like stateful continuations or continuations with saved heap?

By : MrTheEdge
Date : March 29 2020, 07:55 AM
To fix the issue you can do I don't think typical continuation implementations support the automatic tracking of the heap, but it is definitely something that can be added relatively easily.
For example, the Seaside web framework uses continuations to model the flow of displayed components. Since saving the complete heap would be expensive, developers can register which objects they like to track. This works by creating a snapshot at the time the continuation is created, and restoring the object at the time the continuation is resumed. This enables to automatically restore application state as the back- and forward buttons in the browser are used.

## Lisp is for List Processing. Is there a language for Tree Processing?

By : user3923965
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I don't see that the change would be very profound. Lisp certainly doesn't have any problem with letting lists be members of other lists, so it can easily represent trees, and algorithms on trees.
Conversely, every list can be regarded as a tree of a particular shape (in various ways).

## Scala tree processing

By : Nasurudeen MK
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Can someone please help me with this exercise from Scala for the impatient? , This is because your leafSum function returns Integer instead of Int: