Lazy evaluation refers to a variety of concepts that seek to avoid evaluation of an expression unless its value is needed, and to share the results of evaluation of an expression among all uses of its, so that no expression need be evaluated more than once.
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Lazily load permissions from database in multithreading environment
I would like to get the feedback about this code:
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Snoozy: A lazy reevaluation upon get
I would appreciate critique and comments in regards of thread-safety on a basic type I'm trying to create.
In C#, the Lazy<T> type is initialized only once, ...
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Optionally Lazy Parameters
Inspired by Swift's @autoclosure feature, I tried writing a brief C++-14 header that permits "optionally" lazy parameters (by "lazy" I mean ...
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Python lazy dict with iterator in constructor
This question began as an off-topic answer to this question, but the code here serves a different goal.
I wrote the following class for the purpose of populating a dict on demand from an iterator. ...
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C++ lazy constructor
I'm implementing a lazy constructor in C++. The goal is that for a type T, lazy<T>(args...) returns a callable object ...
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Lazy String splitter in C++
I created a string splitter in C++. It splits a string in a lazy fashion and makes use of forward iterators to sequentially supply the next token from the string until it runs out of tokens.
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Lazy prime number generator
There are multiple Project Euler problems (e.g. 7, 10) that deal with prime numbers. I decided make a reusable solution that could be used for most of them.
I wrote a method to generate an infinite* ...
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Finding a Cartesian product of multiple lists
I came up with an extension method to find a Cartesian product of multiple IEnumerable sets. I was able to achieve lazy enumeration via ...
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Understanding lazy sequence in Clojure
In order to understand how the lazy sequences work in Clojure, I decided to implement the quick-sort example from the "The Joy of Clojure, Second Edition" book simulating lazy sequences in Java. Of ...
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Lazy WebAPI object
I am working to design an object which would abstract away the use of a WebAPI. I want the developer to be able to use these objects as if they are using a traditional API.
My core problem is how to ...
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Caching data by using the result of first running operation
My code handles concurrent requests by waiting for the result of an already running operation. Requests for data may come in simultaneously with same/different credentials (including empty credentials)...
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Poor man's lazy evaluation in Java 8
I have an class that cheaply imitates a lazy evaluation scheme. The class is for representing a file and additionally providing meta data on the file. Some of the meta-data can be expensive to ...
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Unity Lazy Resolve Implementation
I have been using Microsoft.Unity as my container and have decided that the approach for a lazy implementation causes too much rework. Each time you decide to swap ...
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Reading lines from a file in random order
I originally wrote this as an answer to a question on Stack Overflow, but it turned out so nicely that I decided to post it here to see if I can make it even better.
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Clojure word count
I'm fairly new to Clojure and looking to improve my use of the proper idioms, and make my code more readable. Here's the problem:
Read from standard input and produce the count of each word to ...
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Early-termination foldLeft for Scala Streams
The foldRight and foldLeft methods for Scala Streams cannot terminate early, so here is my ...
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Date formatters, lazily instantiated once
I would like to create two date formatters only on first call. In Objective-C I would use dispatch_once() but now working in Swift. Am I doing it correctly? My code ...
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3answers
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Loading visible images
I am using this code to get images to load only if they are visible. However, it seems to be slow with thousands of images, even if they are not rendered.
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Lazy properties for the angle and length of a line segment
The code below shows the pattern I use to manage properties in my classes when I have the following requirements:
Some properties are slow to calculate and are rarely used, so I want them to be lazy
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Lazy String.Split
C#'s String.Split method comes from C# 2.0, and lazy operations weren't a feature back then. The task is to split a string according to a (single) separator. Doing ...
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SICP streams in C++
To brush up on my C++ chops, I've implemented a toy version of "SICP Streams", which behave like lists with one twist: the first element of the list is always available, the rest of the list is stored ...
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Converting an array-returning function to a lazy evaluator
Take a look at the following function:
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Lazy Load for multiple entities at a time
We have a system with a non standard database solution. All trips to the DB are rather expensive. We cannot use entity framework.
Currently our lazy loading is on an entity by entity basis. So if I ...
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Perfect elimination ordering and high memory usage
The following code calculates a perfect
elimination ordering in a special case in Haskell.
I am less worried about its correctness than
its high use of memory. The following code runs
out of memory ...
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Lazily Load CSS and JS
I have written this piece of JS and CSS loading code and I would like some advice on it. Anything some of the JavaScript gurus could possibly point out would be much appreciated. The code works, but I ...
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AsyncLazy disposal
I've made this extension method. Its purpose is to trigger the disposal of a value, stored in a Nito.AsyncEx AsyncLazy, as authored by @StephenCleary.
Is this an ...
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Generic cached value class mimicking Lazy<T>
Before I wrote this I searched and found a number of solutions that make use of a caching provider to handle a set of items. I felt that was too cumbersome of an approach and set out to create a class ...
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2answers
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Azure cache getoradd (without locking)
Inspired by the non-locking implementation proposed in this post, the following code is an attempt to (about) do the same using the azure cache. As I'm totally green on the Azure cache I'd appreciate ...
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Lazy loading with __get
I have my own PHP MVC framework that I'm iteratively developing (i.e. adding a feature when I have the time). I'm trying to keep it to the best practices I can, while still adding the most in terms of ...
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Are there any issues in this `Lazy` implementation?
I have written following small utility to abstract away the lazy initialization logic. (I tend to use lazy variables quite often.)
Are there any issues in this implementation?
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Lazy class instantiation in Python
I've written some class which allows me to derive from it to make objects lazy-instantiated. Do you see notational improvements or maybe even cases where this method might not work (multiple ...
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Lazy look and say sequence
I have been solving a set of online Clojure problems. One of them involves the look and say sequence.
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