btoo

import { useRef, useEffect } from 'react';

/**
 * a type-safe version of the `usePrevious` hook described here:
 * @see {@link https://reactjs.org/docs/hooks-faq.html#how-to-get-the-previous-props-or-state}
 */
export function usePrevious<T>(
  value: T,
): ReturnType<typeof useRef<T>>['current'] {
  const ref = useRef<T>();

Nachasic

import * as React from 'react';
import { mount } from 'enzyme';
import { serialize, deserialize } from './react-seritalize';

class CustomComponent extends React.Component<any, any> {
    render () {
        return <div className="CustomComponent" >{this.props.children}</div>
    }
}

karol-majewski

export function flatMap<T, U>(array: T[], callbackfn: (value: T, index: number, array: T[]) => U[]): U[] {
  return Array.prototype.concat(...array.map(callbackfn));
}

d1i1m1o1n

How to disable auto-save:
Go to File > Settings (Ctrl+Alt+S).
Go to Appearance & Behavior > System Settings.
Make sure the two are unchecked:
Save files on frame deactivation
Save files automatically if application is idle for x sec.
Go to Editor > General > Editor Tabs
Put a checkmark on "Mark modified files with asterisk"
(Optional but recommended) Under "Tab Closing Policy", select "Close non-modified files first". You may also want to increase the number of allowed tabs.
Click Apply > OK.

lolzballs

import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

public class HelloWorld{
	private static HelloWorld instance;
    public static void main(String[] args){
        instantiateHelloWorldMainClassAndRun();

stephenparish

Commit Message Conventions

These rules are adopted from the AngularJS commit conventions.

• Goals
• Generating CHANGELOG.md
  • Recognizing unimportant commits
  • Provide more information when browsing the history
• Format of the commit message
• Subject line