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 |
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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."); | |
}; |
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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(); | |
} |
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// 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()); | |
}); |
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.
elem.offsetLeft
,elem.offsetTop
,elem.offsetWidth
,elem.offsetHeight
,elem.offsetParent
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// 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; | |
}; |
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// 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. |