varhello=function(name){return"hello: "+name;}; hello=_.wrap(hello,function(func){ return"before, "+func("moe")+", after"; }); hello(); // 'before, hello: moe, after' 上面代码先定义hello函数,然后将hello传入一个匿名定义,返回一个新版本的hello函数。 (5)compose方法 该方法接受一系列...
varhello =function(name) {return"hello: " +name; }; hello= _.wrap(hello,function(func) {return"before, " + func("moe") + ", after"; }); console.log(hello());=> before, hello: moe, after compose: 组合函数调用关系,把单独的f(),g(),h()组合成f(g(h())) vargreet =function...
var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}]; _.max(stooges, function(stooge){ return stooge.age; }); => {name: 'curly', age: 60}; min_.min(list, [iteratee], [context]) 返回list中的最小值。如果传递iteratee参数,...
复制代码代码如下: _.template("<%if (data.title) { %>Title: <%= title %><% } %>", null, { variable: "data" }); 因为template在变量替换时,内部使用with语句,所以上面这样的做法,运行速度会比较快。
var hello = function(name) { return "hello: " + name; }; hello = _.wrap(hello, function(func) { return "before, " + func("moe") + ", after"; }); hello(); => 'before, hello: moe, after' negate_.negate(predicate) 返回一个新的predicate函数的否定版本。
Underscore.js是一个很精干的库,压缩后只有4KB。它提供了几十种函数式编程的方法,弥补了标准库的不足,大大方便了JavaScript的编程。MVC框架Backbone.js就将这个库作为自己的工具库。除了可以在浏览器环境使用,Underscore.js还可以用于Node.js。Underscore.js定义了一个下划线(_)对象,函数库的所有方法都属于这个对象。
var hello = function(name) { return "hello: " + name; }; hello = _.wrap(hello, function(func) { return "before, " + func("moe") + ", after"; }); hello(); => 'before, hello: moe, after' 1. 2. 3. 4. 5. 6. compose_.compose(*functions) 返回一个函数列的组合物,其中...
Run Underscore.js in noConflict mode, returning the _ variable to its previous owner. Returns a reference to the Underscore object. _.noConflict = function() { root._ = previousUnderscore; return this; };¶ Keep the identity function around for default iteratees. _.identity = function(...
But, after ES2015, it can be implemented in vanilla JavaScript like this: const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; numbers.forEach((number) => console.log(number)); Checking whether a variable is an array If we wanted to check if a variable is an array, we woul...
Javascript lacks complete string manipulation operations. This an attempt to fill that gap. List of build-in methods can be found for example from Dive Into JavaScript.As name states this an extension for Underscore.js, but it can be used independently from _s-global variable. But with ...