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MessagePosté le: Lun 2 Mai - 06:16 (2016)    Sujet du message: Javascript La Guia Definitiva-adds Répondre en citant




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Javascript La Guia Definitiva-adds


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But the pattern is the same whether we use native * constructors like String() or user-defined constructors like Person(). Details Pick up your parcel at a time and place that suits you. */ /** * Creating Object() objects using "object literals" */ var myObject = new Object(); myObject.living = true; myObject.age = 33; myObject.gender = 'male'; myObject.getGender = function() {return myObject.gender;}; console.log(myObject); // logs myObject object and properties var myObject = { living: true, age: 23, gender: 'male', getGender: function() {return myObject.gender;} }; // notice the last property has no comma after it console.log(myObject); // logs myObject object and properties var myObject = { 'living': true, 'age': 23, 'gender': 'male', 'getGender': function() {return myObject.gender;} }; console.log(myObject); // logs carlos object and properties /** * All objects inherit from Object.prototype */ Object.prototype.foo = 'foo'; var myString = 'bar'; console.log(myString.foo); // logs 'foo', being found at Object.prototype.foo via prototype chain /** * Conceptual overview of using Function() objects */ var addNumbersA = new Function('num1', 'num2', 'return num1 + num2'); console.log(addNumbersA(2, 2)); // logs 4 // could also be written the literal way, which is much more common var addNumbersB = function(num1, num2) { return num1 + num2; }; console.log(addNumbersB(2, 2)); // logs 4 /** * Function() parameters */ var addFunction = new Function('num1', 'num2', 'return num1 + num2'); /* * Alternately, a single comma-separated string with arguments can be * the first parameter of the constructor, with the function body following. Esta publicacin tiene 45 meses de antigedad, te invitamos a buscar publicaciones ms recientes relacionados a este tema aqu. You can still win! Try bidding again. console.log(typeof myError); // logs object /** * Dynamic Properties allow for mutable objects */ // Augment the built-in String constructor Function() with the augmentedProperties property String.augmentedProperties = []; // if the prototype does not have trimIT() add it if(!String.prototype.trimIT) { String.prototype.trimIT = function() { return this.replace(/^s+s+$/g, ''); } // now add trimIT string to the augmentedProperties array String.augmentedProperties.push('trimIT'); } var myString = ' trim me '; console.log(myString.trimIT()); // invoke our custom trimIT string method, logs 'trim me' console.log(String.augmentedProperties.join()); // logs 'trimIT' /** * All constructor instances have constructor properties that point to their constructor function */ var foo = {}; console.log(foo.constructor === Object) // logs true, because object() constructed foo console.log(foo.constructor) // points to the Object() constructor function var myNumber = new Number('23'); var myNumberL = 23; // literal shorthand var myString = new String('male'); var myStringL = 'male'; // literal shorthand var myBoolean = new Boolean('true'); var myBooleanL = true; // literal shorthand var myObject = new Object(); var myObjectL = {}; // literal shorthand var myArray = new Array(); var myArrayL = []; // literal shorthand var myFunction = new Function(); var myFunctionL = function() {}; // literal shorthand var myDate = new Date(); var myRegExp = new RegExp('/./'); var myRegExpL = /./; // literal shorthand var myError = new Error(); // all of these return true console.log( myNumber.constructor === Number, myNumberL.constructor === Number, myString.constructor === String, myStringL.constructor === String, myBoolean.constructor === Boolean, myBooleanL.constructor === Boolean, myObject.constructor === Object, myObjectL.constructor === Object, myArray.constructor === Array, myArrayL.constructor === Array, myFunction.constructor === Function, myFunctionL.constructor === Function, myDate.constructor === Date, myRegExp.constructor === RegExp, myRegExpL.constructor === RegExp, myError.constructor === Error ); var CustomConstructor = function CustomConstructor(){ return 'Wow!'; }; var instanceOfCustomObject = new CustomConstructor(); console.log(instanceOfCustomObject.constructor === CustomConstructor); // logs true // returns a reference to CustomConstructor() function // returns 'function() { return 'Wow!'; };' console.log(instanceOfCustomObject.constructor); /** * Verify that an object is an instance of a particular constructor function */ var CustomConstructor = function() {this.foo = 'bar';}; // user-defined object constructor var instanceOfCustomObject = new CustomConstructor(); // instantiate an instance of CustomConstructor console.log(instanceOfCustomObject instanceof CustomConstructor); // logs true // works the same as a native object console.log(new Array('foo') instanceof Array) // logs true /** * An instance created from a constructor can have its own independent properties (aka instance properties) */ var myArray = new Array(); myArray.prop = 'test'; console.log(myArray.prop) // logs 'test' // this can be done with any of the native constructors that actual produce an object var myString = new String(); var myNumber = new Number(); var myBoolean = new Boolean(true); var myObject = new Object(); var myArray = new Array(); var myFunction = new Function('return 2+2'); var myRegExp = new RegExp('bt[a-z]+b'); myString.prop = 'test'; myNumber.prop = 'test'; myBoolean.prop = 'test'; myObject.prop = 'test'; myArray.prop = 'test'; myFunction.prop = 'test'; myRegExp.prop = 'test'; // logs 'test', 'test', 'test', 'test', 'test', 'test', 'test' console.log(myString.prop, myNumber.prop, myBoolean.prop, myObject.prop, myArray.prop, myFunction.prop, myRegExp.prop); // be aware: instance properties do not work with primitive/literal values var myString = 'string'; var myNumber = 1; var myBoolean = true; myString.prop = true; myNumber.prop = true; myBoolean.prop = true; // logs undefined, undefined, undefined console.log(myString.prop, myNumber.prop, myBoolean.prop); /** * Working with Objects and Properties * * Complex objects can contain most of the JavaScript values as properties */ var myObject = {}; // contain properties inside of myObject representing most of the native JavaScript values myObject.myFunction = function() {}; myObject.myArray = []; myObject.myString = 'string'; myObject.myNumber = 33; myObject.myDate = new Date(); myObject.myRegExp = /a/; myObject.myNull = null; myObject.myUndefined = undefined; myObject.myObject = {}; myObject.myMathPI = Math.PI; myObject.myError = new Error('Crap!'); console.log( myObject.myFunction, myObject.myArray, myObject.myString, myObject.myNumber, myObject.myDate, myObject.myRegExp, myObject.myNull, myObject.myNull, myObject.myUndefined, myObject.myObject, myObject.myMathPI, myObject.myError ); //works the same with any of the complex objects, for example a function var myFunction = function() {}; myFunction.myFunction = function() {}; myFunction.myArray = []; myFunction.myString = 'string'; myFunction.myNumber = 33; myFunction.myDate = new Date(); myFunction.myRegExp = /a/; myFunction.myNull = null; myFunction.myUndefined = undefined; myFunction.myObject = {}; myFunction.myMathPI = Math.PI; myFunction.myError = new Error('Crap!'); console.log( myFunction.myFunction, myFunction.myArray, myFunction.myString, myFunction.myNumber, myFunction.myDate, myFunction.myRegExp, myFunction.myNull, myFunction.myNull, myFunction.myUndefined, myFunction.myObject, myFunction.myMathPI, myFunction.myError ); /** * Encapsulating complex objects in a programmatically beneficial way */ // encapsulation using objects, creates object chains var object1 = { object11: { object111: {foo: 'bar'}, object112: {}, }, object12: { object121: {}, object122: {}, } }; console.log(object1.object11.object111.foo); // logs 'bar' // encapsulation using arrays, creates multidimensional array chain var myArray= [[[]]]; // an empty array, inside an empty array, inside an empty array /* * Here is an example of encapsulation using functions: an empty function inside an empty * function inside an empty function. Sign inYour AccountTryPrimeYourLists Basket0 Your Amazon.co.ukToday's DealsGift CardsSellHelp Books Advanced Search Best Sellers Top New Releases Deals in Books Best Books of the Month School Books Textbooks Books Outlet Children's Books Calendars & Diaries Find "javascript la guia definitiva adds" on Amazon.com Computing & Internet › Programming › Languages Share Facebook Twitter Pinterest 75.23 RRP: 76.58 You Save: 1.35 (2%) FREE Delivery in the UK. */ var myString = 'string'; var myNumber = 10; var myBoolean = false; var myNull = null; var myUndefined = undefined; /** * How complex values are stored/copied in JavaScript */ var myObject = {}; var copyOfMyObject = myObject; // not copied by value, just the reference is copied myObject.foo = 'bar'; // manipulate the value stored in myObject /* * Now if we log myObject & copyOfMyObject, they will have a foo property because they * reference the same object. 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