Preserving signatures of decorated functions

Suppose I have written a decorator that does something very generic. For example, it might convert all arguments to a specific type, perform logging, implement memoization, etc. Here is an...

How to convert lazy sequence to non-lazy in Clojure

I tried the following in Clojure, expecting to have the class of a non-lazy sequence returned: (.getClass (doall (take 3 (repeatedly rand)))) However, this still returns clojure.lang.LazySeq. ...

How can I prevent the main form capturing keystrokes in a TMemo on another non-modal form?

I have an app that opens a non-modal form from the main form. The non-modal form has a TMemo on it. The main form menu uses "space" as one of its accelerator characters. When the non-modal form...

Silverlight RIA: Server-side extension properties on model are not ignored by RIA

In my SilverLight app I have a simple entity-model containing one table: [Memo]. The memo table definition/class layout: pseudo-code-mode Partial Class Memo ID [int autonumbering] Memo ...

Fast prime factorization module

I am looking for an implementation or clear algorithm for getting the prime factors of N in either python, pseudocode or anything else well-readable. There are a few requirements/constraints: N...

Python - anyone have a memoizing decorator that can handle unhashable arguments?

I've been using the following memoizing decorator (from the great book Python Algorithms: Mastering Basic Algorithms in the Python Language ... love it, btw). def memo(func): cache = {} @...

Overbyte ICS HTTPS POST

I'm wanting to create a CloudFlare client in the Firemonkey framework. For those who don't know, CloudFlare serves as a CDN of sorts for anyone with a website. They have an API available, and as...

Selective Re-Memoization of DataFrames

Say I setup memoization with Joblib as follows (using the solution provided here): from tempfile import mkdtemp cachedir = mkdtemp() from joblib import Memory memory = Memory(cachedir=cachedir,...

SSIS Access to SQL. Binding error: The binding status was "DT_NTEXT"

I am trying to get an SSIS package inherited from a previous colleague to execute. The package pulls from an Access database and then puts the data into an SQL database. One of the fields, let's...

Magento change grand total

I have a requirement in which the customer has to pay only a certain percentage of the total amount online. The rest is paid physically. So if the customer buys a product of $100, then he has to...

How best to memoize based on argument only, not function closure, and inside a class?

(question edited and rewritten to reflect chat discussion results) In one line: Given a state in a state monad, evaluate monadic function once, cache the results. I am trying to cache the result...

Adding Memoization - Dynamic Programming

I am currently practicing some dynamic programming and I came across the Circus Tower problem. I solved the problem with dynamic programming and implemented it using recursion. I've tested it...

1D Memoization in Recursive solution of Longest Increasing Subsequence

Calculating LIS (Longest Increasing Subsequence) in an array is a very famous Dynamic Programming problem. However in every tutorial they first show the recursive solution without using the...

Fibonacci Memoized/Dynamic Programming in Java

So this is some code to calculate the Fibonacci sequence with memoization. What confuses me is when we check if memo[i]==0. I understand that Java arrays are initialized to zero and thus if...

How to handle nil parameter, when data inserted in create method

Elixir: 1.6 Phoenix: 1.3 I tried to insert parameter, but when one of parameters like 'memo' is null. How can I handle nil parameter in general? I just wanna nil check like this. memo = (memo ==...

What does useCallback/useMemo do in React?

As said in docs, useCallback Returns a memoized callback. Pass an inline callback and an array of inputs. useCallback will return a memoized version of the callback that only changes if one of the...

React useMemo hook use case

Context After reading through the official doc for hooks, I wanted to try useMemo in one of my projects. To test it, I set up a sandbox project here. The example uses an expensive computation...

Updating a Material-UI TextField onBlur with Formik (React)

I'm currently rendering an editable table that lets the user bulk edit several user's information at once (See Image). I'm using Material-UI's <TextField/> and Formik to handle the form's...

Type androidx.appcompat.resources.R$dimen is defined multiple times

We have a React Native app where after upgrading to Android Studio 3.6.1 and Gradle plugin 3.6.1 we are seeing this compilation error: Type androidx.appcompat.resources.R$dimen is defined multiple...

Why did this reselect selector cause a re-render?

One of my components was re-rendering, and I realised it was because of the allPageViews selector below: const getPages = (state: IAppState) => { return state.pages; }; export const...

How to add groovy 3.0.3 as maven dependency in a maven project?

I have my current project having groovy version 2.4.7. So i have the below maven dependency in my project <dependency> <groupId>org.codehaus.groovy</groupId> ...

Reducer function passed to useReducer hook is executed multiple times for one dispatch call when reducer function is dependant on a component prop

I was reading an article called “A Complete Guide to useEffect” and tried to implement and an example from “Why useReducer Is the Cheat Mode of Hooks” section. In that example there is a...

Why does this solution work in Javascript but not in Python? (Dynamic programming)

I'm following this tutorial about dynamic programming and I'm struggling to implement memoization in the following problem: *Write a function called canSum(targetSum, numbers) that returns True...

How to test a memoized component's callback using React Testing Library?

I'm using React Testing Library with Jest to test my components. One of the components renders a table with data so I decided to use React.memo as suggested by the table library's author. I'm...

useEffect exhaustive-deps warning: what possible issues is this trying to avoid?

I realize there have been many questions about React's useEffect hook's dependency array, and the eslint warning that may arise from missing dependencies. Some other good discussions about...

ESLint rule for Object & array dependencies in the React useEffect Hook

The app that I work on is having an issue with using non-memoized versions of reference types such as arrays, objects, and functions (see Object & array dependencies in the React useEffect Hook)....

How can I put emojis in a TButton or TBitBtn Caption

I'm working with Delphi 10.4.2, creating a VCL app on Windows 10, and I'd like to display some face emojis on buttons in place of normal text. I'm wondering if it can be done using Unicode...

Baffled by the Arrow in Do Statements in Haskell

I am working on understanding the State monad and have written two simple versions of the famous fibonacci to memoize the function. The one with let in the body runs very slowly. The one with <-...

Can instructions in this example from Java Concurrency in Practice be reordered during compiler optimizations

I'm reading the book on subject. In 5.18, Brian Goetz gave an example of semi-efficient memoizer with a non-volatile shared variable cache having the type of ConcurrentHashMap as follows: public...

Python how to process complex nested dictionaries efficiently

I have a complex nested dictionary structured like this: example = { ('rem', 125): { ('emo', 35): { ('mon', 133): { ('ony', 33): 0 }, ...