Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
JavaScript for PHP developers
Search
stoyan
October 09, 2011
Programming
15
1.3k
JavaScript for PHP developers
stoyan
October 09, 2011
Tweet
Share
Other Decks in Programming
See All in Programming
デミカツ切り抜きで面倒くさいことはPythonにやらせよう
aokswork3
0
200
SpecKitでどこまでできる? コストはどれくらい?
leveragestech
0
560
詳しくない分野でのVibe Codingで困ったことと学び/vibe-coding-in-unfamiliar-area
shibayu36
3
4.5k
開発者への寄付をアプリ内課金として実装する時の気の使いどころ
ski
0
350
Goで実践するドメイン駆動開発 AIと歩み始めた新規プロダクト開発の現在地
imkaoru
4
670
Reduxモダナイズ 〜コードのモダン化を通して、将来のライブラリ移行に備える〜
pvcresin
2
690
uniqueパッケージの内部実装を支えるweak pointerの話
magavel
0
920
実践AIチャットボットUI実装入門
syumai
7
2.5k
CI_CD「健康診断」のススメ。現場でのボトルネック特定から、健康診断を通じた組織的な改善手法
teamlab
PRO
0
180
Model Pollution
hschwentner
1
180
Чего вы не знали о строках в Python – Василий Рябов, PythoNN
sobolevn
0
160
Railsだからできる 例外業務に禍根を残さない 設定設計パターン
ei_ei_eiichi
0
340
Featured
See All Featured
Documentation Writing (for coders)
carmenintech
75
5k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.5k
Principles of Awesome APIs and How to Build Them.
keavy
127
17k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
GitHub's CSS Performance
jonrohan
1032
460k
The World Runs on Bad Software
bkeepers
PRO
71
11k
Build your cross-platform service in a week with App Engine
jlugia
232
18k
It's Worth the Effort
3n
187
28k
Side Projects
sachag
455
43k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
30
2.9k
Building Better People: How to give real-time feedback that sticks.
wjessup
368
20k
Transcript
JavaScript for PHP developers Stoyan Stefanov March 11, 2011 Confoo.ca,
Montreal
Stoyan Stefanov ¤ SAP Labs in Montreal ¤ Yahoo! Music, Web Performance,
Search, YSlow, smush.it ¤ Facebook
Stoyan Stefanov - Books
JavaScript – first impressions
DOM/BOM ¤ These days libraries can take care of most pains
¤ Let’s focus on the core JavaScript (ECMAScript) language
JavaScript core ¤ C-like syntax ¤ Small built-in API ¤ (I’ll show
you most of it in 15 minutes)
Strange things ¤ Functions are objects ¤ Functions provide scope ¤ Closures (in
PHP since 5.3) ¤ Prototypes ¤ No classes
Syntax Mostly the same as PHP
Variables var n = 1; $n = 1;
Variables var b = true; $b = true;
Variables var s = "confoo"; $s = "confoo";
Arrays var a = [1,2,3]; $a = array(1,2,3);
Assoc arrays var o = { "one": 1, "two": 2
}; $o = array( "one" => 1, "two" => 2 );
if if (1 === 1) { universe = "fine"; };
if (1 === 1) { $universe = "fine"; };
falsy values 0, "", false, undefined, null 0 == ""
// true 0 === "" // false
switch var a = 1; var result = ""; switch
(a) { case 1: // strict comparison result = "a is 1"; break; default: result = "@#$"; }
try-catch try { throw new Error('ouch'); } catch (e) {
msg = e.message; } try { throw new Exception('ouch'); } catch (Exception $e) { $msg = $e->getMessage(); }
while var i = 0, out = ''; while (i
< 100) { out += ++i + ","; } $i = 0; $out = ''; while ($i < 100) { $out .= ++$i . ","; }
do-while var i = 0, out = ''; do {
out += ++i + ","; } while (i < 100); $i = 0; $out = ''; do { $out .= ++$i . ","; } while ($i < 100);
for for (var i = 0, out = ''; i
< 100; i++) { out += i + ','; } for ($i = 0, $out = ''; $i < 100; $i++) { $out .= $i . ','; }
for-in/foreach for (var k in stuff) { keys += k;
values += stuff[k]; } foreach ($stuff as $k => $v) { $keys .= $k; $values .= $v; }
function function junction(a, b) { return a * b; }
function junction($a, $b) { return $a * $b; }
function function junction(a, b) { b = b || 2;
return a * b; } function junction($a, $b = 2) { return $a * $b; }
function function junction(a, b) { b = typeof b !==
"undefined" ? b : 2; return a * b; } function junction($a, $b = 2) { return $a * $b; }
functions are objects var junction = function (a, b) {
return a * b; }; junction(3, 4); // 12 junction.length; // 2
functions are objects junction.call(null, 3, 4); // 12 junction.apply(null, [3,
4]); // 12 call_user_func('junction', 3, 4); call_user_func_array('junction', array(3, 4));
closures var junction = function (a, b) { return a
* b; }; junction(3, 4); // 12 $junction = function($a, $b) { return $a * $b; }; $junction(3, 4); // 12
function scope $a = function() { $c = 3; $b
= function($a, $b) { return $c * $a * $b; }; return $b; }; $b = $a(); $b(1, 2); // 0 in PHP, 6 in JS
Constructors/Classes var fido = new Dog(); $fido = new Dog();
PHP Class class Dog { var $name; function __construct($name) {
$this->name = $name; } function getName() { return $this->name; } } $fido = new Dog("Fido"); $fido->getName(); // Fido
JS constructor function function Dog (name) { this.name = name;
this.getName = function () { return this.name; }; } var fido = new Dog("Fido"); fido.getName();
JS constructor function ¤ Constructors are just functions ¤ Functions called with
new… ¤ …return this… ¤ …implicitly.
Constructor and prototype function Dog (name) { this.name = name;
} Dog.prototype.getName = function () { return this.name; }; var fido = new Dog("Fido"); fido.getName();
Prototypes ¤ Every function has a prototype property ¤ It’s useless, unless
… ¤ … the functions is called with new.
Constructor and prototype function Dog (name) { this.name = name;
} Dog.prototype.getName = function () { return this.name; }; var fido = new Dog("Fido"); fido.getName(); // Fido
Object literals var fido = { name: "Fido", getName: function()
{ return this.name; } }; fido.getName(); // Fido
Object literals var fido = {};
Object literals var fido = {}; fido.name = "Fido";
Object literals var fido = { name: "Fido" }; fido.name;
// Fido
Object literals var fido = { name: "Fido", getName: function()
{ return this.name; } }; fido.getName(); // Fido
Literals var fido = {}; fido.name = "Fido"; $fido =
(object) array(); $fido->name = "Fido"; $fido = new stdClass(); $fido->name = "Fido";
Literals in PHP $fido = (object)array(); $fido->name = 'Fido'; $fido->getName
= function() { return $GLOBALS['fido']->name; }; $method = $fido->getName; echo $method();
Literals in PHP $fido = new JSObject(); $fido->name = 'Fido';
$fido->getName = function($self) { return $self->name; }; $fido->getName(); // Fido
Literals in PHP class JSObject { function __call($name, $args) {
if (is_callable($this->$name)) { array_unshift($args, $this); return call_user_func_array($this->$name, $args); } } }
Funny operators ¤ typeof ¤ typeof 1; // "number" ¤
typeof(1); ¤ instanceof ¤ ([1,2]) instanceof Array; // true ¤ ([1,2]) instanceof Object; // true ¤ delete ¤ var o = {a: 1}; delete o.a; o.a; // undefined ¤ void ¤ returns undefined whatever the operand
The built-in API In 15 minutes or less
Global object ¤ something Like $GLOBALS[] but object ¤ May or may
not be accessible directly ¤ Accessible as window in browsers
3 global properties ¤ NaN ¤ Infinity ¤ undefined
9 global functions ¤ 4 number-related ¤ parseInt() ¤ parseFloat() ¤
isNaN() ¤ isFinite() ¤ 4 to encode/decode URIs ¤ encodeURIComponent() ¤ decodeURIComponent() ¤ encodeURI() ¤ decodeURI() ¤ eval() PHP: intval() floatval() is_nan() is_finite() urlencode() urldecode() ??() ??() eval()
9+ constructors ¤ Object() ¤ Array() ¤ RegExp() ¤ Function() ¤ String() ¤ Number() ¤ Boolean() ¤ Error(),
SyntaxError()… ¤ Date()
We don’t need no constructors ¤ object literals // yep var
o = {}; // nope var o = new Object();
We don’t need no constructors ¤ array literals // yep var
a = []; // nope var a = new Array();
We don’t need no constructors ¤ regular expression literals // yep
var re = /[a-z]/gmi; // proly nope var re = new RegExp("[a-z]", "gmi");
We don’t need no constructors ¤ functions // yep var f
= function(a, b) {return a + b;}; // yep function f(a, b) {return a + b;} // nope var f = new Function("a, b", "return a + b;");
We don’t need no constructors ¤ strings // yep var s
= "confoo"; // nope var s = new String("confoo"); s.substr(3); // "foo" "confoo".substr(0, 4); // "conf"
We don’t need no constructors ¤ numbers // yep var n
= 1.2345; // nope var n = new Number(1.2345); n.toFixed(2); // 1.23
We don’t need no constructors ¤ boolean // yep var b
= true; // nope, why would you ever var b = new Boolean(true);
We don’t need no constructors ¤ Errors throw new Error("Ouch"); //
but you could also throw { name: "MyError", message: "Ouch" };
Constructors ¤ Object() ¤ Array() ¤ RegExp() ¤ Function() ¤
String() ¤ Number() ¤ Boolean() ¤ Error(), SyntaxError()… ¤ Date()
The built-in API (contd.) Properties and methods
Object.prototype var o = {}; o.toString(); // "[object Object]" o.toLocaleString();
// "[object Object]" o.valueOf() === o; // true o.hasOwnProperty('toString'); // false o.propertyIsEnumerable('toString'); // false o.isPrototypeOf(Array); // false o.constructor === Object; // true
Array.prototype var a = [1,2,3,4]; a.length; // 4 a.push('dude'); //
5, the length a.pop(); // "dude" a.unshift('dude'); // 5, the length a.shift(); // "dude" a.concat(5,6,7); // [1,2,3,4,5,6,7]
Array.prototype a.sort(callback); a.indexOf(3); // 2 a.lastIndexOf(3); // 2 a.slice(1, 3);
// [2, 3] a.splice(...); // remove and add a.reverse(); // [4, 3, 2, 1] a.join(' > '); // implode()
RegExp.prototype var re = /[a-z]/gmi; re.exec("somestring"); // returns matches re.test("somestring");
// returns true|false re.lastIndex; re.source; // "[a-z]" /[0-9]/g.global; // true /[0-9]/m.multiline; // true /[0-9]/i.ignoreCase; // true
Function.prototype ¤ length ¤ name // not standard ¤ call() ¤ apply()
String.prototype var s = "confoo"; s.length; // 6 s.indexOf('o'); //
1 s.lastIndexOf('o'); // 5 s.charAt(1); // "o" s.charCodeAt(1); // 111
String.prototype s.toLowerCase(); s.toUppercase(); s.toLocaleLowerCase(); s.toLocaleUpperCase(); s.localeCompare();
String.prototype s.split(/f/); // ["con", "oo"] s.concat('.ca'); // "confoo.ca" s.search(/foo/); //
3 s.replace(/o/g, "@"); // c@nf@@ s.match(/[a-z]/g); // ["c", "o", "n", .. s.slice(3, 6); // "foo" s.substring(0, 3); // "con", substr() too
Number.protoype new Number(123).toFixed(2); // "123.00" (1000000000000).toExponential(); // "1e+12" (1000000000000).toPrecision(3); //
"1.00e+12" Number.MAX_VALUE; // 1.7976931348623157e+308 Number.MIN_VALUE; // 5e-324 Number.POSITIVE_INFINITY; // Infinity Number.NEGATIVE_INFINITY; // -Infinity Number.NaN; // NaN
Math ¤ Not a constructor ¤ Constants Math.E, Math.PI... and 6 more
¤ Methods Math.min(), Math.max(), Math.random(), Math.sin() ... and 14 more
Error.prototype ¤ name ¤ message
Date.prototype ¤ You’re on your own! var d = new Date(2011,
3, 11); d.getDate(); d.getDay(); d.getFullYear(); d.getHours(); d.getMilliseconds(); d.getMinutes(); d.getMonth(); d.getSeconds(); d.getTime(); d.getTimezoneOffset(); d.getUTCDate(); d.getUTCDay(); d.getUTCFullYear(); d.getUTCHours(); d.getUTCMilliseconds(); d.getUTCMinutes(); d.getUTCMonth(); d.getUTCSeconds(); d.getYear(); d.setDate(); d.setFullYear(); d.setHours(); d.setMilliseconds(); d.setMinutes(); d.setMonth(); d.setSeconds(); d.setTime(); d.setUTCDate(); d.setUTCFullYear(); d.setUTCHours(); d.setUTCMilliseconds(); d.setUTCMinutes(); d.setUTCMonth(); d.setUTCSeconds(); d.setYear(); d.toDateString(); d.toGMTString(); d.toLocaleDateString(); d.toLocaleFormat(); d.toLocaleTimeString(); d.toString(); d.toTimeString(); d.toUTCString(); Date.now(); Date.parse(); Date.UTC();
Constructors ¤ Object() ¤ Array() ¤ RegExp() ¤ Function() ¤
String() ¤ Number() + Math ¤ Boolean() ¤ Error(), SyntaxError()… ¤ Date()
Quiz What have we learned today?
¤ JavaScript has classes C
¤ Arrays are objects C
¤ Functions are objects C
¤ Classes have a prototype property C
¤ Objects have a prototype property C
¤ Functions have a prototype property C
¤ Prototype properties are used with new C
phpjs.org ¤ When you miss a PHP function in JavaScript
Learning ¤ https://developer.mozilla.org/en/JavaScript/ Reference ¤ ECMAScript tweeps: @DmitrySoshnikov, @abozhilov, @kangax, @WebReflection ¤ http://jsmentors.com
¤ Slides: http://slideshare.net/stoyan/
Thank you!