axemclion

// This sample is a Work in Progress for JSI , and specific functions may change. 

#pragma once

#include <string>
#include <unordered_map>

#include <jsi/jsi.h>

// This SameplJSIObject needs to inheric from HostObject, and this is the object that will be exposed to JS.

mavame

/**
 * Use this class to ensure Google Maps API javascript is loaded before running any google map specific code.
 */
export class GoogleMapsApi {
  /**
   * Constructor set up config.
   */
  constructor() {
    // api key for google maps

oliyh

// hard won knowledge from http://stackoverflow.com/questions/20035615/using-raw-image-data-from-ajax-request-for-data-uri
var xmlHTTP = xhr.XMLHttpRequest();
xmlHTTP.open('GET', url, true);
xmlHTTP.responseType = 'arraybuffer';
xmlHTTP.onload = function(e) {
  var arr = new Uint8Array(this.response);
  var raw = String.fromCharCode.apply(null,arr);
  var b64 = base64.encode(raw);
  var dataURL="data:image/png;base64," + b64;
};

paulirish

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

demisx

Provider	Singleton	Instantiable	Configurable
Constant	Yes	No	No
Value	Yes	No	No
Service	Yes	No	No
Factory	Yes	Yes	No
Decorator	Yes	No?	No
Provider	Yes	Yes	Yes

Constant

katowulf

// assumes you add a timestamp field to each record (see Firebase.ServerValue.TIMESTAMP)
// pros: fast and done server-side (less bandwidth, faster response), simple
// cons: a few bytes on each record for the timestamp
var ref = new Firebase(...);
ref.orderByChild('timestamp').startAt(Date.now()).on('child_added', function(snapshot) {
  console.log('new record', snap.key());
});

kekscom

function toLocalISOString(d) {
  var off = d.getTimezoneOffset();
	return new Date(d.getFullYear(), d.getMonth(), d.getDate(), d.getHours(), d.getMinutes() - off, d.getSeconds(), d.getMilliseconds()).toISOString();
}

ryasmi

var triangular = function (value) {
    var abs = Math.abs(value);
    return ((abs / 2) * (abs + 1)) * (abs / value) || 0;
};

// Testing code.
var testTriangular = function () {
    var testTriangularValue = function (arg, value, id) {
        console.log(triangular(arg) === value ? "Test " + id + " passed." : "Test " + id + " failed.");
    };