Questions tagged [expression-trees]
Expression Trees are an abstract representation of code in a tree structure where each node of the tree represents a programming construct (conditional, assignment, method call, etc.)
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Designing a basic Binary Expression Tree structure
Preface
I need to generate some algebraic expressions for math testing in elementary school. The test should generate a list of expressions compiled according to certain rules and check the ...
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Deleter for Simple Expression Tree in C++
I have created a simple abstract class called expr_node which will serve as a base class for any expression-related nodes.
My goal is to create a simple deleter ...
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A simple method to execute Entity Framework Core queries in parallel
As you might know, EF Core does not support executing multiple queries in parallel on the same context using something like Task.WhenAll.
So you have to write this ...
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Immutable builder and updater
There aren't enough questions about creating immutable objects... so why not try it again with another approach. This time, it's a builder that maps properties to constructor parameters. Properties ...
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Evaluate an expression binary tree - Daily Coding Challenge
Here is my solution for the Daily Coding Challenge 50
Given an arithmetic expression in the form of a binary tree, write a function to evaluate it
Example
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Simple object validator with a new API
Quite some time ago I have created the Simple object validator (see also self-answer). The more I used it the more I thougt its API could be better so I have heavily refactored it and would like to ...
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Populating dropdown lists, using SQL vs. using expression trees and reflection
I'm working with a large enterprise SQL Server database with dozens of tables that are used mainly as lookups to populate dropdown lists, etc. These tables all follow the convention of having (table)...
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Configure multiple application features by common criteria
My FeatureSerivce provides only basic APIs, so it is good in dealing with single features. Like I can configure only one feauture at a time:
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Creating keys/names from interfaces to avoid strings
There are many APIs that require some kind of a string key/name. I usually try to avoid using raw strings and prefer to use ...
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Quiz for random boolean expressions
Inspired by the various quiz programs on this site, as well as Simon Tatham's puzzle collection, I thought I'd write a quiz that constructs its questions automatically and randomly. A typical session ...
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Adjusting business logic conveniently through JSON and expression trees
I need to evaluate some data. The rules how it should be done are changing frequently (it's an evolving model) so I don't want to rewrite my application each time such a change comes. I'd rather do it ...
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Dynamic setting names based on properties
In one of my frameworks that I use with many tools I have an ExpressionVisitor whose job is to resolve the exact property, it's declaring type and instance. I ...
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Expression tree in Haskell with support for differentiation
A simple binary expression tree in Haskell without operator precedence and without parentheses.
Any comments would be much appreciated.
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Building unusual IComparer<T> from expressions
I've needed a couple of very special comparers recenty and didn't want to implement each one of them every time so I created a builder and a couple of supporting classes that do that for me.
Example
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Selective updates to immutable types
There is a way in Scala to selectively change a field while making a copy of the immutable object:
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