functional light javascript

We are looking for ways to tune JavaScript so that we can do some real functional programming. To do this, it is necessary to fully understand function calls and function prototypes. We are looking for ways to tune JavaScript so that we can do some real functional programming. To do this, it is necessary to fully under

actual needs of the corresponding extension.function makeMenu(items, tags) { tags = tags || [‘ul‘, ‘li‘]; // default tags var parent = tags[0]; var child = tags[1]; var item, value = ‘‘; for (var i = 0, l = items.length; i How to use:// Dropdown select monthmakeMenu( [‘January:JAN‘, ‘February:FEB‘, ‘March:MAR‘], // item:value [‘select‘, ‘option‘]);// List of groceriesmakeMenu( [‘Carrots‘, ‘Lettuce‘, ‘Tomatos‘, ‘Milk‘], [‘ol‘, ‘li‘]);Summary:These are just a few of the useful

Object nature of functional programming for javascript: Functiona () { varx= " Sth "; returnb () { //dowithx; } } var c=a (); equivalent to Functiona () { this.x= "Dosth"; This.b=function () { //dowiththis.x } } Varc=newa (); But 1) functional programming instinctively avoids the construction of useless objects Because

价于：//square(sum(-1*mean + x)),再次展开(我剥,我剥,我剥洋葱...)://Math.pow(sum(-1*mean + x),2);compose(square,sum(-1*mean + x))Next look at the map function://很清楚吧！？即data中每一个元素都为一个x，将其传入后面的函数，然后返回一个计算后的新数组，即新数组中的每个元素的值是data中的每个元素加上data负的平均数，然后对其结果计算2次方的结果。map(data,Math.pow(sum(-1*mean + x),2))Then look at the reduce function outside map://将前面新数组的每个元素值加起来。reduce(map(...),sum)Then take a look at the reciprocal function://等价于求(data.length-1)的倒数reciprocal(sum(data.length,-1))Then look at the outer product functio

The object nature of JavaScript's functional programming:function A (){var x= "Sth"; return B () {//do with X;}}var C = a ();equivalent tofunction A (){this.x = "Dosth";this.b = function () {//do with This.x}}var c = new A ();but1) Functional programming instinctively avoids the construction of useless objectsbecause functional programming encourages the use of c

function: Custom each functions function each (arr,func) { var length = arr.length; for (var i = 0 I Corrie: It is the technique of transforming a function that accepts multiple parameters into a function that accepts a single parameter (the first parameter of the original function) and returns a new function that accepts the remaining parameters and returns the result. Defines the Add function and returns a function functions Add (num) {return function (x) {return n

JavaScript functional programmingThe object nature of functional programming in JavaScript:Function (){Var x = "something ";Return B (){// Do with x;}}Var c = ();EquivalentFunction (){This. x = "dosomething ";This. B = function (){// Do with this. x}}Var c = new ();However1) functional programming instinctively avoids

the problem of private variables, and this point); Affirmation: There are many ways to solve the above problems on the Internet. It's just that I figured it out. So to share with you, Master laughed at. Yes, it's on the bus again, I solved the problem. The essence of JavaScript Language 52nd page 5.4 function Let me take a look at the source code for this functional constructor: Bold to emphasize This me

Javascript: the Inheritance section in thegoodparts describes a functional Inheritance method. It is not clear how to translate this functional, the purpose of this pattern is to make sure that the object attributes are truly private. We cannot directly access the object status and can only operate through privileged methods. Here is an example. The Code is as

general functions.functionAdd(A, B) {return a + b;} Add1,2);3functionMultiply(A, B) {return a * b;} Multiply10, 2); //20//more specific functions. var AddOne = Bindfirstarg (add, 1); AddOne (2); //3addOne (3); //4addOne (10); //11addOne (9000); //9001var multiplybyten = Bindfirstarg (multiply, Multiplybyten (2); //20multiplyByTen (3); //30multiplyByTen (10); //100multiplyByTen (9000); //90000 The highlight of the above code is not that it can bind a parameter to any function, and

The efficiency of code execution is critical to both programmers and programs, especially when it comes to functional methods that require a lot of calls and calls repeatedly. In many JavaScript frameworks you can see functions that are called repeatedly. When it comes to using these frameworks, we have to be careful to take optimized code writing as much as possible. One way to optimize code is to use a ju

Recently learning JavaScript, in the middle see map and reduce method, feel very interesting, learn to write this blog.Both of these functions embody the idea of functional programming to some extent, and the function is passed as an argument to another function.The caller of the map () method is typically an array, and the parameter is a function called callback, which is a new set of return values that ea

))); return trampoline (Dotake, N, Gen, []); Purity, immutability and policies for change Object#freeze = Deepfreeze API: Let object modification method return new Object instance flow-based Programming _.chain Lazychain thunk:a function waiting to be called #force () JQuery $. Deferred () Pipelining Action (Monad): Flowing in context? Lift Actions Programming without Class Mixin

Closure (closure) is the concept of functional programming, appearing in the 1960s, the earliest implementation of the closure language is Scheme, which is a dialect of LISP. After that, closure features are widely absorbed in other languages.The strict definition of closures is "a collection of functions (environments) and their closed free variables." "This definition is a bit obscure to everyone, so let's start with examples and less rigorous expla

: function test (x) { Alert ("Define an identity function"); } var test = function () { Alert ("Point an anonymous function to a reference"); } (Function () { Alert ("I am an anonymous function"); } ();//This is actually an anonymous function that has been defined and executed Most languages support the operation of a function as an operand (parameter). However, because the functions are positioned differently, they do not have the same result. When a funct

The main is to eliminate string spaces in JavaScript, to compare the two different ways// object-oriented, eliminating whitespace on both sides of a string function () {returnthis. Replace (/(^\s*) | ( \s*$)/g, "");}; // to the function of the left and right spaces; function Trim (s) { return s.replace (/(^\s*) | ( \s*$)/g, "");}Called to eliminate whitespace in two ways.var defualtphone = defualtdeliveryarray[0].getelementsbytagname ("TD") [4].textc

5.1 Abstraction: in the final analysis, the program is to solve the problems in life, but most of the time the problems in reality are always very complicated. The solution to minimize the complexity of the program is to abstract it. Abstract many complex relationships into simpler logics and apply them to programs. This is my abstract understanding of programming. Function programming creates abstraction through clever function combinations. 5.2 high-order functions: Simply put, high-order func

identity function ");}Var test = function (){Alert ("pointing an anonymous function to a reference ");}(Function (){Alert ("I am an anonymous function ");}) (); // An anonymous function has been defined and executed here. Most languages support using functions as operation elements (parameters) for calculation. However, due to the different positioning of functions, their calculation results are not the same. When a function in JavaScript is used as

");}Var test = function (){Alert ("pointing an anonymous function to a reference ");}(Function (){Alert ("I am an anonymous function ");}) (); // An anonymous function has been defined and executed here. Most languages support using functions as operation elements (parameters) for calculation. However, due to the different positioning of functions, their calculation results are not the same. When a function in JavaScript is used as a parameter, it is

Let add = x=>x+1;//map:: (A-B), [a], [B]let Map= (function(Result,f,arr) {//Closure Store Cumulative ObjectsLet result = []; return functionMap (F,arr) {if(!Array.isarray (arr)) { return"Objects to be processed for array"; } if(Arr.length ==0){ return []; }Else{Let [head,... tail]=arr; Result.push (f (head)); //traversing the target object via a callback map arr,f the processed elements into the result,tail for [] that is the end of the tra