javascript essence notes_javascript skills

//Add a method to the constructor prototype
Function.method=function(name,func){
　this.prototype.name=func;
}

Number.method("integer" ,function(){
　return Math[this });
(-10/3).integer();//- 3

String.method("trim",function(){
return this.replace(/^s |s $/g,'');
})
" neat ".trim();//neat
//closure
var quo = function(status){
return{
get_status:function(){
return status;
}
　}
}
var myQuo = new quo("amazed");
myQuo.get_status();//amazed

//Closed classic example fragment
for(var i=0;i lis.onclick=function(i){
return function(){
alert(i);
};
　}(i);
}

//Apply
Function.method("curry",function(){
　var slice=Array.prototype.slice,
args = slice.apply(arguments),
that = this;
return function(){
return that.apply(null,args.contact(arguments));
}
})

//Memory recursion
var memoization = function(memo,usefn){//Abstraction
var fn = function(n){
var result = memo[n] ;
if(typeof result!=='number'){
result=usefn(fn,n);
memo[n]=result;
}
return result;
};
return fn;
};
var factorial= memoization([0,1],function(fn,n){//Recursive form
return fn(n-1) *n
});
factorial(5)//120