Heaven's Kitchen

js風だと

こんな感じ？かなり無理やりな箇所があるけど

Array.prototype.setGeneral=function(func){

this.__gen=func;

return this;

}

Array.prototype.item=function(n){

if(this.__gen!=undefined){

var length=this.length;

for(var i=length-1;i+1<=n;i++){

var copy=eval("["+this.toString()+"]");

this[i+1]=this.__gen.apply(this,copy.reverse());

}

return this[n];

}else{

return this[n];

}

}

var test=[1,2,3].setGeneral(function(x){return x+1;});

var fib=[0,1].setGeneral(function(xn,xn_1){return xn+xn_1;});