JavaScript patterns

Jan 16, 20110 likes1,085 views

The document contains code snippets that demonstrate various JavaScript patterns and anti-patterns including: defining functions, object prototypes, loops, type coercion, constructors, closures, exceptions, callbacks, and more. It aims to show both proper and improper ways to write JavaScript code.

functon some () {
“use strict”;
// do something...
ubar = ‘dedededfe’ // error
}

for (var i = 0; i < myarray.length; i++ ) {
// = some
}

for (var i = 0, max = myarray.length; i < max ;i++ ) {
// = some
}

var man = { heads : 2, legs : 2 };
Object.prototype.clne = function() {};

for (var i in man) {
if (man.hasOwnProperty(i)) {
console.log(i, ‘:’, man[i]);
} # => heads:2
} # legs:2

var zero = 0;
if (zero === false) {
// good
}

if (zero == false) {
// anti pattern
}

// anti pattern
parseInt(“012”) => 10

// good way
parseInt(“012”, 10) => 12
Number(“012”) => 12

var Person function(name) {
this.name = name;
this.say = function(){ return “ test “ + this.name };
}

var person = new Person(“aaa”);

function Gadget () {
var name = “aaaa”;

this.getName = function () { return name};
this.setName = function (n) { name = n };
}

var g = new Gadget();
g.getName();
g.setName(‘test’);
g.name = “change”;

var Person = function(name) {
this.name = name;
this.say = function(){ return “ test “ + this.name };
}

var person = Person(“aaa”);
person.name // => this will reference window.name or
global symbol ‘name’

var Wafﬂe = function() {
var that = { msg : ‘yummy’ };
return that;
}

var wafﬂe = new Wafﬂe(); // => {msg: ‘yummy’};

function Wafﬂe() {
if(!(this instanceof Wafﬂe)) {
return new Wafﬂe();
}

this.tastes = ‘yummy’ ;
}
var wafﬂe = Wafﬂe(); // is instance of Wafﬂe

try {
throw {
name : “someError”,
message : “error test”,
test : function() { return name }
};
} catch (e) {
console.log(e.test());
}

try {
throw {
name : “someError”,
message : “error test”,
errorStatus : 312
};
} catch (e) {
return [message, e.errorStatus];
}

function Gadget () {
this.name = “aaaa”;

this.getName = function () { return name};
this.setName = function (n) { name = n };
}

var g = new Gadget();
g.name = “changed”;

$var blog = Blog.load( {blog_id: 2} ); var entry = blog.entries().ﬁrst(); var logger = function(msg) { console.log(“Blog : “ + blog.id + “ Entry : “ + entry.id + msg) }; logger(“see this”) / /=> “Blog id : 2 Entry id : 3 see this”$

$var blog = Blog.load( {blog_id: 2} ); var entry = blog.entry(); function cusutom_logger(blog_id, entry_id) { return function(msg) { console.log(“Blog : “ + blog_id + “ Entry : “ + entry_id + msg)}; } var logger = cusutom_logger(blog.id, entry.id); logger(“see this”) / /=> “Blog id : 2 Entry id : 3 see this”$

$(‘div1’).onclick = function () {
alert (‘aaa’);
}
$(‘div2’).onclick = function () {
alert (‘bbb’);
}
....

$$(‘div1’).onclick = gen_alert(‘aaa’); $(‘div2’).onclick = gen_alert(‘bbb’); function gen_alert(msg) { return function { alert(msg) }; }$

$typedef int (*CALLBACK)(* void); // pointer type for int func(void *) typedef struct { CALLBACK handler; void * option; } callback_data; callback_data callback; void register_callback (CALLBACK f, void* opt) { callback.handler = f; callback.option = opt; } void invoke_callback() { CALLBACK f = callback.handler; f(callback.option); } char * msg = “message”; int speak() { printf (“%s”, (char *)void) }; main () { register_callback((CALLBACK)speak, (void *)msg); invoke_callback(); }$

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JavaScript patterns

11. functon some () { “use strict”; // do something... ubar = ‘dedededfe’ // error }

14. for (var i = 0; i < myarray.length; i++ ) { // = some } for (var i = 0, max = myarray.length; i < max ;i++ ) { // = some }

17. var man = { heads : 2, legs : 2 }; Object.prototype.clne = function() {}; for (var i in man) { if (man.hasOwnProperty(i)) { console.log(i, ‘:’, man[i]); } # => heads:2 } # legs:2

19. var zero = 0; if (zero === false) { // good } if (zero == false) { // anti pattern }

21. // anti pattern parseInt(“012”) => 10 // good way parseInt(“012”, 10) => 12 Number(“012”) => 12

24. var Person function(name) { this.name = name; this.say = function(){ return “ test “ + this.name }; } var person = new Person(“aaa”);

26. function Gadget () { var name = “aaaa”; this.getName = function () { return name}; this.setName = function (n) { name = n }; } var g = new Gadget(); g.getName(); g.setName(‘test’); g.name = “change”;

28. var Person = function(name) { this.name = name; this.say = function(){ return “ test “ + this.name }; } var person = Person(“aaa”); person.name // => this will reference window.name or global symbol ‘name’

29. var Waffle = function() { var that = { msg : ‘yummy’ }; return that; } var waffle = new Waffle(); // => {msg: ‘yummy’};

30. function Waffle() { if(!(this instanceof Waffle)) { return new Waffle(); } this.tastes = ‘yummy’ ; } var waffle = Waffle(); // is instance of Waffle

31. try { throw { name : “someError”, message : “error test”, test : function() { return name } }; } catch (e) { console.log(e.test()); }

32. try { throw { name : “someError”, message : “error test”, errorStatus : 312 }; } catch (e) { return [message, e.errorStatus]; }

33. function Gadget () { this.name = “aaaa”; this.getName = function () { return name}; this.setName = function (n) { name = n }; } var g = new Gadget(); g.name = “changed”;

34. var blog = Blog.load( {blog_id: 2} ); var entry = blog.entries().ﬁrst(); var logger = function(msg) { console.log(“Blog : “ + blog.id + “ Entry : “ + entry.id + msg) }; logger(“see this”) / /=> “Blog id : 2 Entry id : 3 see this”

35. var blog = Blog.load( {blog_id: 2} ); var entry = blog.entry(); function cusutom_logger(blog_id, entry_id) { return function(msg) { console.log(“Blog : “ + blog_id + “ Entry : “ + entry_id + msg)}; } var logger = cusutom_logger(blog.id, entry.id); logger(“see this”) / /=> “Blog id : 2 Entry id : 3 see this”

39. $(‘div1’).onclick = function () { alert (‘aaa’); } $(‘div2’).onclick = function () { alert (‘bbb’); } ....

40. $(‘div1’).onclick = gen_alert(‘aaa’); $(‘div2’).onclick = gen_alert(‘bbb’); function gen_alert(msg) { return function { alert(msg) }; }

41. typedef int (*CALLBACK)(* void); // pointer type for int func(void *) typedef struct { CALLBACK handler; void * option; } callback_data; callback_data callback; void register_callback (CALLBACK f, void* opt) { callback.handler = f; callback.option = opt; } void invoke_callback() { CALLBACK f = callback.handler; f(callback.option); } char * msg = “message”; int speak() { printf (“%s”, (char *)void) }; main () { register_callback((CALLBACK)speak, (void *)msg); invoke_callback(); }

JavaScript patterns

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