Created
August 23, 2010 07:58
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/** | |
* 人 | |
*/ | |
var person = function(spec){ | |
var that = {}; | |
var toString = function(){ | |
return spec.name + " " + spec.age.toString(); | |
}; | |
that.toString = toString; | |
var getName = function(){ | |
return spec.name; | |
}; | |
that.getName = getName; | |
var getAge = function(){ | |
return spec.age; | |
}; | |
that.getAge = getAge; | |
return that; | |
}; | |
/** | |
* グループ | |
*/ | |
var group = function(spec){ | |
var that = {}; | |
that = enumerable(that); | |
var persons = []; | |
var add = function(ps){ | |
persons[persons.length] = ps; | |
return that; | |
}; | |
that.add = add; | |
var toString = function(){ | |
return persons.join(","); | |
}; | |
that.toString = toString; | |
var each = function(f){ | |
var i; | |
for (i = 0; i < persons.length; i++) { | |
f(persons[i]); | |
} | |
}; | |
that.each = each; | |
return that; | |
}; | |
/** | |
* Enumerable - コンテナが要素に対して行う処理。 | |
* コンテナで each メソッドが定義されていることを要求する。 | |
*/ | |
var enumerable = function(that){ | |
var map = function(f){ | |
var result = []; | |
that.each(function(e){ | |
result[result.length] = f(e); | |
}); | |
return result; | |
}; | |
that.map = map; | |
var filter = function(p){ | |
var result = []; | |
that.each(function(e){ | |
if (p(e)) { | |
result[result.length] = e | |
} | |
}); | |
return result; | |
}; | |
that.filter = filter; | |
var fold = function(z, f){ | |
var acc = z; | |
that.each(function(e){ | |
acc = f(acc, e); | |
}); | |
return acc; | |
}; | |
that.fold = fold; | |
return that; | |
}; | |
var g = group({}).add(person({ | |
name: "Hanako", | |
age: 15 | |
})).add(person({ | |
name: "Jiro", | |
age: 15 | |
})).add(person({ | |
name: "Tarou", | |
age: 21 | |
})); | |
//g = enumerable(g); | |
g.each(function(ps){ | |
console.log(ps.toString()); | |
}); | |
var g2 = g.map(function(ps){ | |
return ps.getAge() * 2; | |
}); | |
console.log(g2.toString()); | |
var g3 = g.filter(function(ps){ | |
return ps.getAge() < 20; | |
}); | |
console.log(g3.toString()); | |
var g4 = g.fold(0, function(acc, ps){ | |
return acc + ps.getAge(); | |
}); | |
console.log(g4.toString()); | |
var g4 = g.fold("", function(acc, ps){ | |
return acc + ps.getName(); | |
}); | |
console.log(g4.toString()); |
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