foreach

问题 I have a JSON array like below. I want to print only the values of the name. But I am getting undefined index name and getting value of name.below is my json. [{"docId":{"id":"57dd70252a896558e573a0c8"},"docProfile":{"name":"gowtham","gender":null,"email":null,"mobile":"7406339908"},"docLocalInfo":{"username":"gowtham","otp":934343,"newPasswordToken":null,"tempMobile":"","adminVerfiy":null},"privateInfo":{"mciNumber":null,"aadharNumber":null,"panNumber":null},"tempHospitals":[],"bankInfo"

问题 While reading the documentation about streams, I came across the following sentences: ... attempting to access mutable state from behavioral parameters presents you with a bad choice ... if you do not synchronize access to that state, you have a data race and therefore your code is broken ... [1] If the behavioral parameters do have side-effects ... [there are no] guarantees that different operations on the "same" element within the same stream pipeline are executed in the same thread. [2]

问题 Following this question Foreach loop for disposing controls skipping iterations it bugged me that iteration was allowed over a changing collection: For example, the following: List<Control> items = new List<Control> { new TextBox {Text = "A", Top = 10}, new TextBox {Text = "B", Top = 20}, new TextBox {Text = "C", Top = 30}, new TextBox {Text = "D", Top = 40}, }; foreach (var item in items) { items.Remove(item); } throws InvalidOperationException: Collection was modified; enumeration operation

问题 I have the following snippet JQuery inside an HTML file: $.getJSON("/events/", function (data) { viewModel = ko.mapping.fromJS(data); ko.applyBindings(viewModel); }); The code is executed when, for example, the user presses a button and returns JSON like: {"Events":[{"Name":"Event1"},{"Name":"Event2"},{"Name":"Event3"}]} This result is linked (using KnockoutJS ) to: <ul data-bind="foreach: Events"> <li><span data-bind="text: Name"></span></li> </ul> Everything works fine with the first call

问题 I am currently trying parallel computing in R. I am trying to train a logistic ridge model , and I currently have 4 Cores on my computer. I would like to split my data set equally into 4 pieces, and use each core to train model (on the training data) and save the result of each core into a single vector . the problem is that i have no clue how to do it, right now I tried to parallel with the foreach package, but the problem is the each core sees the same training data. here is the code with

问题 namespace MyNamespace { public struct MyStruct { public string MyString; public int MyInt; public bool MyBool; } public class MyClass { private List<MyStruct> MyPrivateVariable; public List<MyStruct> MyVariable { get { if (MyPrivateVariable == null) { MyPrivateVariable = new List<MyStruct>(); MyPrivateVariable.Add(new MyStruct()); MyPrivateVariable.Add(new MyStruct()); } return MyPrivateVariable; } } public void MyLoop() { foreach (MyStruct ms in MyVariable) { // Doesn't compile, but it works

问题 Perhaps I'm simply having trouble understanding how php handles arrays. I'm trying to print out an array using a foreach loop. All I can seem to get out of it is the word "Array". <?php $someArray[]=array('1','2','3','4','5','6','7'); // size 7 foreach($someArray as $value){ echo $value; ?> <br /> <?php } ?> This prints out this: Array I'm having trouble understanding why this would be the case. If I define an array up front like above, it'll print "Array". It almost seems like I have to

问题 Is there a problem when accessing/writing to global variable in using doSNOW package on multiple cores? In the below program, each of the MyCalculations(ii) writes to the ii-th column of the matrix "globalVariable"... Do you think the result will be correct? Will there be hidden catches? Thanks a lot! p.s. I have to write out to the global variable because this is a simplied example, in fact I have lots of outputs that need to be transported from within the parallel loops... therefore,

问题 I was using a foreach loop to go through a list of data to process (removing said data once processed--this was inside a lock). This method caused an ArgumentException now and then. Catching it would have been expensive so I tried tracking down the issue but I couldn't figure it out. I have since switched to a for loop and the problem seems to have went away. Can someone explain what happened? Even with the exception message I don't quite understand what took place behind the scenes. Why is

问题 I am using forEach() method called from an array in JavaScript. When I write return; somewhere inside the method which is called for every element in array I return out from the method which was called for a specific element and that is all. But what I actually want is to return out from the method in which array called forEach(). Here is the code: function addToCart(pizza, size) { Cart.forEach(function(cartItem) { if(pizzaAndSizeAreTheSame(cartItem, pizza, size)) { cartItem.quantity++;