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@dtakahas
dtakahas / babby.rb
Last active December 28, 2021 03:56
How is babby formed in Rails?
class Babby < PragnentGirl::GetPragnent
attr_accessible :name, :mother, :location, :pragnent_girl_id
belongs_to :pragnent_girl
before_save :destroy_instain_mothers
after_save :pary_for_father
#How is babby formed?
@Olical
Olical / binary-search.js
Last active October 18, 2020 15:16
JavaScript binary search with the same API as indexOf. Performance: http://jsperf.com/binaryindexof-and-indexof
/**
* Performs a binary search on the host array. This method can either be
* injected into Array.prototype or called with a specified scope like this:
* binaryIndexOf.call(someArray, searchElement);
*
* @param {*} searchElement The item to search for within the array.
* @return {Number} The index of the element which defaults to -1 when not found.
*/
function binaryIndexOf(searchElement) {
'use strict';
(ns react-cljs.core
(:require-macros [reactjs.macros :refer [pure]])
(:require React [reactjs.core :as r]))
(enable-console-print!)
(declare render-ui)
(defn render-counter [id state cb]
(pure state
@sebmarkbage
sebmarkbage / lower-case-convention.md
Last active October 8, 2024 14:30
React JSX - Lower Case

Lower Case JSX Convention

All lower case JSX tags will now be treated as HTML/SVG elements. They will no longer be treated as custom components in scope.

The React element produced by JSX can be either a React class that exists in the local scope or a global scope HTML/SVG element depending on a convention.

Previous Behavior

Currently, when you use React JSX to define a HTML element you can use any known HTML tag. E.g:

@paulirish
paulirish / what-forces-layout.md
Last active November 15, 2024 16:45
What forces layout/reflow. The comprehensive list.

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics
  • elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
@jamestalmage
jamestalmage / How_Require_Extensions_Work.md
Last active February 28, 2024 18:22
Breakdown of How Require Extensions Work

Why

Doing require extensions correctly is essential, because:

  1. Users should be able to install multiple extensions in succession, and have them work together.
  2. Coverage tools like nyc need it to reliably supply coverage information that takes into account sourcemaps from upstream transforms.
  3. Because non-standard, un-predictable behavior causes hard to solve bugs, and major headaches for project maintainers.

What is a require extension anyways?

@markerikson
markerikson / nodeenvDiscussion.md
Last active January 9, 2023 15:24
Summary of process.env.NODE_ENV and its use with Webpack

[02:06 PM] acemarke: @Steven : a couple other thoughts on the whole NODE_ENV thing. First, per my comments, it really is a Node concept. It's a system environment variable that Node exposes to your application, and apparently the Express web server library popularized using its value to determine whether to do optimizations or not
[02:08 PM] acemarke: Second, because of its use within the Node ecosystem, web-focused libraries also started using it to determine whether to they were being run in a "development" environment vs a "production" environment, with corresponding optimizations. For example, React uses that as the equivalent of a C #ifdef to act as conditional checking for debug logging and perf tracking. If process.env.NODE_ENV is set to "production", all those if clauses will evaluate to false.
Third, in conjunction with a tool like UglifyJS that does minification and removal of dead code blocks, a clause that is surrounded with if(process.env.NODE_ENV !== "development")

@colophonemes
colophonemes / README.md
Last active March 8, 2024 01:50
Postgres Distributed Key Generation

Postgres Distributed Key Generation

This SQL creates a Postgres function to generate sequential, numeric, unique IDs in a consistent format across services. Useful for database sharding or microservices.

Draws heavily on Instagram's ID generator, via Rob Conery, with minor modifications.

The main changes are that the unique number resolution is per-second rather than per-millisecond. This is to reduce key size below 2^53^-1 so that generated IDs that are under Javascripts Number.MAX_SAFE_INTEGER limit . This is important if you're using these on a Node.js server (e.g. our use case is an Express API using Hashids).

Max IDs are in the order of 51 bits, broken down as follows:

  • 31 bits for the timestamp difference
@jkrems
jkrems / es-module-history.md
Last active August 19, 2024 02:13
History of ES modules

Modules - History & Future

History

@samthor
samthor / undoer.js
Last active March 9, 2019 02:26
Native Undo & Redo helper
// This code now lives at https://github.com/samthor/undoer (or 'undoer' on NPM).