paulononaka

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

paulononaka

[
  {
    "RegiaoId": 13,
    "Nome": "MG",
    "Descricao": "Minas gerais"
  }
]

paulononaka

import UIKit

class SwiftKeyboardAvoiderHelper: NSObject, UITextFieldDelegate {
  private let durationTime: Double! = 0.2
  private var viewController: UIViewController!
  private var originalFrame: CGRect!
  private var necessaryShift: CGFloat! = 0

  var shift: CGFloat!
  var target: UIView!

paulononaka

$(document).ready(function() {
  $form = $("#signup-form");
  $form.bind("ajax:beforeSend", function(evt, xhr, settings){

    var $submitButton = $form.find('.btn-submit');
    $submitButton.attr("disabled", true);
    $submitButton.data('origText', $submitButton.text());
    $submitButton.text("Cadastrando..." );

  })

paulononaka

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

paulononaka

Capybara

save_and_open_page

Matchers

have_button(locator)

paulononaka

== last commit that changed a specific file

git rev-list -n 1 HEAD -- <file_path>

== checkout file from commit

git checkout <deleting_commit>^ -- <file_path>

== list files changed in one specific commit

paulononaka

public static String getIPAddress() throws SocketException {
	for (Enumeration<?> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
		NetworkInterface intf = (NetworkInterface) en.nextElement();
		for (Enumeration<?> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
			InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement();
			if (!inetAddress.isLoopbackAddress()) {
				return inetAddress.getHostAddress().toString();
			}
		}
	}

paulononaka

private static byte[] intToLittleEndian(long numero) {
	ByteBuffer bb = ByteBuffer.allocate(4);
	bb.order(ByteOrder.LITTLE_ENDIAN);
	bb.putInt((int) numero);
	return bb.array();
}

// OR ...

private static byte[] intToLittleEndian(long numero) {

paulononaka

public static void installApk(Context context, File apkFile) {
	Intent intent = new Intent(Intent.ACTION_VIEW);
	intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
	context.startActivity(intent);
}