method-chaining

JavaScript Functional Programming - Chaining Functions and using an anonymous function

由 ∥☆過路亽．° 提交于 2019-12-10 12:06:28
问题 I was doing a question on CodeWars and practicing some functional programming when I encountered a problem while trying to apply a function to a value. So I made a pass() function that accepts a function as an argument so that I could use an anonymous function to manipulate that value and then return it. So, in this case, it takes the value from reduce and passes it to a function so it can manipulate that value then return it. It WORKS but I really don't want to add a method to the Object

How can I properly chain custom methods in Ruby?

由 家住魔仙堡 提交于 2019-12-09 05:25:00
问题 I am trying to do a chaining method for the following two methods. After running this code, I kept getting the following output: #<SimpleMath:0x007fc85898ab70>% My question is: what is the proper way of chaining methods in Ruby ? Here is my codes: class SimpleMath def add(a,b=0) a + b return self end def subtract(a,b=0) a - b return self end end newNumber = SimpleMath.new() print newNumber.add(2,3).add(2) 回答1: Are you trying to do something like this? class SimpleMath def initialize @result =

Chained methods and continuation indent in Intellij

由 老子叫甜甜 提交于 2019-12-08 15:00:35
问题 I've never figured out how to make Intellij handle continuation indent for chained methods properly, and apparently today is the day it's annoyed me enough to consult you lovely people. What I want is this: makeAThing( "with", "params" ) .setProperty("with some more params") .start(); What I get is this: makeAThing( "with", "params" ) .setProperty("with some more params") .start(); I get this in Java, Groovy, JavaScript and a bunch of other places. How can I persuade Intellij not to add

Pandas - Calculate New Value Based on Cross Reference with Another Column

由 青春壹個敷衍的年華 提交于 2019-12-08 10:39:44
问题 I'm trying to calculate new values in a column whose values are cross-referenced to another column. >>> import pandas as pd >>> df = pd.DataFrame( {"A":[0., 100., 80., 40., 0., 60.], "B":[12, 12, 3, 19, 3, 19]} ) >>> df A B 0 0.0 12 1 100.0 12 2 80.0 3 3 40.0 19 4 0.0 3 5 60.0 19 I want to find all values in column A that are 0, find out the corresponding value in column B, then change all column A values that have the same column B value, according to some function. For instance in the

Is it worth to use method chaining in C#?

由 我怕爱的太早我们不能终老 提交于 2019-12-08 05:13:41
问题 Having Collection initializers in C# and being allowed to define properties of a class without having to call the constructor, is there any point in using Method Chaining in C#? I can't see any. Maybe I'm missing something here? Thanks 回答1: LINQ? var item = sequence.Where(x => x.Age > 100) .Select(x => new { x.FirstName, x.LastName }) .OrderBy(x => x.LastName) .FirstOrDefault(); 回答2: A common use is fluent interfaces EDIT: In response to the questions in the comments, property/collection

Is this the right way to implement chaining in javascript?

由 喜你入骨 提交于 2019-12-08 03:31:21
问题 After reading up online I wrote this simple code that does addition and multiplication via chaining. But reading the code, it looks like to me, that the method "Result" makes the code less readable and kind of seems redundant. Can someone help me get rid of the Result function? var Calculator = function () { var result = 0; this.Add = function (x) { result = result + x; return this; }; this.Multiply = function (x) { result = result * x; return this; }; this.Result = function () { return

What is the correct way to chain methods in .Net

由 ╄→гoц情女王★ 提交于 2019-12-07 13:10:29
问题 In .Net, you can chain methods returning a value or by using a void. Is one of them the "right way"? So you could say 1) Foo myFoo = new Foo(); myfoo.Bars = myBars.DoSomethingCool(x) .DoSomethingElse(y) .AndSomethingElse(z); public static IList<IBar> DoSomethingCool(this IList<IBar> source, object x) { IList<IBar> result = //some fn(source) return result; } In this case, all 3 extension methods need to return IList (the type for myFoo.Bars) or it could also be written as 2) myBars

Check if call is method chaining

由 二次信任 提交于 2019-12-07 12:00:47
问题 Is it possible to know if a method call is from a method chaining? For example, I have the bellow class : class Test{ protected $string = '123'; public function a($string){ $this->string .= $string; if(method chain){ return $this; }else{ return $this->string; } } public function b($string){ $this->string .= $string; if(method chain){ return $this; }else{ return $this->string; } } } Result: $test = new Test(); echo $test->a('000'); // 123000 echo $test->a('000')->b('www'); // 123000www UPDATE

Java method call chaining in static context

由 旧巷老猫 提交于 2019-12-07 01:25:46
问题 In StringBuilder class I can do like this: StringBuilder sb = new StringBuilder(); sb.append( "asd").append(34); method append returns StringBuilder instance, and I can continuosly call that. My question is it possible to do so in static method context? without class instance 回答1: Yes. Like this (untested). public class Static { private final static Static INSTANCE = new Static(); public static Static doStuff(...) { ...; return INSTANCE; } public static Static doOtherStuff() { .... return

Is it worth to use method chaining in C#?

由 倾然丶 夕夏残阳落幕 提交于 2019-12-06 16:13:39
Having Collection initializers in C# and being allowed to define properties of a class without having to call the constructor , is there any point in using Method Chaining in C#? I can't see any. Maybe I'm missing something here? Thanks LINQ? var item = sequence.Where(x => x.Age > 100) .Select(x => new { x.FirstName, x.LastName }) .OrderBy(x => x.LastName) .FirstOrDefault(); A common use is fluent interfaces EDIT: In response to the questions in the comments, property/collection initialisers are fairly limited in that you can only set propeties or call the Add method on a collection, whereas
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