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console.log('Conta'); | |
class Conta { | |
constructor() { | |
this.saldo = 0; | |
} | |
deposita(valor) { | |
this.saldo += valor; | |
} | |
} | |
class ContaPoupanca extends Conta { | |
atualiza(indice) { | |
this.saldo += this.saldo * indice; | |
} | |
} | |
console.log(new Conta().deposita == new Conta().deposita); // true | |
var conta1 = new Conta(); | |
Conta.prototype.deposita = function() { | |
return 1; | |
}; | |
var conta2 = new Conta(); | |
console.log(conta1.deposita()); // 1 | |
console.log(conta2.deposita()); // 1 | |
console.log(new ContaPoupanca().constructor == ContaPoupanca); // true | |
console.log(new ContaPoupanca().constructor == Conta); // false | |
// Modelo ES5 não compatível | |
console.log('ContaES5'); | |
function ContaES5() { | |
this.saldo = 0; | |
this.deposita = function(valor) { | |
this.saldo += valor; | |
}; | |
} | |
function ContaPoupancaES5() { | |
//não preciso copiar de Conta... | |
this.atualiza = function(indice) { | |
this.saldo += this.saldo * indice; | |
}; | |
} | |
console.log(new ContaES5().deposita == new ContaES5().deposita); // false | |
var conta1 = new ContaES5(); | |
ContaES5.prototype.deposita = function() { | |
return 1; | |
}; | |
var conta2 = new ContaES5(); | |
var conta3 = new ContaES5(); | |
conta3.deposita = function() { | |
return 1; | |
}; | |
console.log(conta1.deposita()); // undefined | |
console.log(conta2.deposita()); // undefined | |
console.log(conta3.deposita()); // 1 | |
console.log(new ContaPoupancaES5().constructor == ContaPoupancaES5); // false | |
console.log(new ContaPoupancaES5().constructor == ContaES5); // true | |
// Modelo ES5 compatível | |
console.log('ContaOK'); | |
function ContaOK() {} | |
Object.assign(ContaOK.prototype, { | |
saldo: 0, | |
deposita: function(valor) { | |
this.saldo += valor; | |
} | |
}); | |
function inherit(child, parent, members) { | |
return Object.assign(Object.create(parent.prototype), members, { | |
constructor: child | |
}); | |
} | |
function ContaPoupancaOK() {} | |
inherit(ContaPoupancaOK, ContaOK, { | |
atualiza: function(indice) { | |
this.saldo += this.saldo * indice; | |
} | |
}); | |
console.log(new ContaOK().deposita == new ContaOK().deposita); // true | |
var conta1 = new ContaOK(); | |
ContaOK.prototype.deposita = function() { | |
return 1; | |
}; | |
var conta2 = new ContaOK(); | |
console.log(conta1.deposita()); // 1 | |
console.log(conta2.deposita()); // 1 | |
console.log(new ContaPoupancaOK().constructor == ContaPoupancaOK); // true | |
console.log(new ContaPoupancaOK().constructor == ContaOK); // false |
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