javascript rails 编程
function map(ls,func){ var d=[]; for(var i=0;i<ls.length;i++){ d.push(func.call(this,ls)) } return d; } map(,function(n){return n+1})function select(ls,func){ var d=[]; for(var i=0;i<ls.length;i++){ if(func.call(this,ls)) d.push(ls) } return d; } select(,function(n){return n%2==0;})2
function reject(ls,func){ var d=[]; for(var i=0;i<ls.length;i++){ if(!func.call(this,ls)){d.push(ls)} } return d; } reject(,function(n){ return n%2==0})
function any(ls,func){ for(var i=0;i<ls.length;i++){ if(func.call(this,ls)) return true } return false;} function truth(n){ if(n){return true}else{return false}}any(,truth)true
function all(ls,func){ for(var i=0;i<ls.length;i++){ if(!func.call(this,ls)) return false; } return true;} function truth(n){ if(n){return true}else{return false}}all(,truth)
function max(ls,func){ var d = ls.sort(func);console.log(d); return d;} max(,function(s1,s2){ if(s1.age <= s2.age){return -1}else{return 1} }) function min(ls,func){ var d = ls.sort(func);console.log(d); return d;} min(,function(s1,s2){ if(s1.age > s2.age){return -1}else{return 1} })
function uniq(ls){ var d =[];var r=[]; for(var i=0;i<ls.length;i++){ d] = ls;} for(var field in d){r.push(d)}; return r;}uniq()
function range(start,end,step) { if(arguments.length==1){end=start;start=1;step=1;} if(!step){step=1}; var r=[]; for(var i=start;i<=end;i=i+step){r.push(i)} return r; }range(10)range(1,10)range(2,10)
function fib(n){ return n<2 ? n : arguments.callee(n-1) + arguments.callee(n-2) }
function delay(func,time,args){console.log(args);setTimeout(function(args){ return ( function(){func.apply(this,args)} )()} ,time)};delay(function(n){alert("yes "+n)},1000,10);
bind = function(func, obj) { return function() { return func.apply(obj, arguments); };};
当然之前写的rails 风格的代码以及有人实现，名叫 Underscore.js，
感兴趣的人可以看看
http://documentcloud.github.com/underscore
其中有几个经典的用法
var fibonacci = function(n) {return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);};var fastFibonacci = _.memoize(fibonacci);_.mixin({capitalize : function(string) { return string.charAt(0).toUpperCase() + string.substring(1).toLowerCase();}});_("fabio").capitalize();=> "Fabio"var compiled = _.template("hello: <%= name %>");compiled({name : 'moe'});=> "hello: moe"var list = "<% _.each(people, function(name) { %> <li><%= name %></li> <% }); %>";_.template(list, {people : ['moe', 'curly', 'larry']});=> "<li>moe</li><li>curly</li><li>larry</li>"
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