ternary-operator

问题 With the Python (2.7) ternary expression x if cond else y what is the logical order when evaluating multiple expressions of these nested in order: e.g. 1 if A else 2 if B else 3 Drawing out the truth table for this is appears this is evaluated as 1 if A else (2 if B else 3) rather than (1 if A else 2) if B else 3 : A True False B True 1 2 False 1 3 Could someone please explain why this is executed in this order, and possibly suggest some material that gives an intuition about why this is used

问题 I came across this code written by someone else. Is this usage of the conditional operator recommended or commonly used? I feel it is less maintainable - or is it just me? Is there any alternate way of writing this? exp_rsp_status = req.security_violation ? (dis_prot_viol_rsp && is_mstr) ? uvc_pkg::MRSP_OKAY : uvc_pkg::MRSP_PROTVIOL : req.slv_req.size() ? ((is_mst_abort_rsp && dis_mst_abort_rsp) || ((req.slv_req[0].get_rsp_status()==uvc_pkg::MRSP_PROTVIOL) && dis_prot_viol_rsp) || (is_mst

问题 The ESLint rule for indent allows for you to specify which nodes are ignored, when determining whether the rule should apply to that node, using the ignoredNodes option. I've got the following code that I want to ignore with this rule: const a = b ? `c${ d }` : e Specifically, the line with d and the subsequent line are reported as having two more spaces than they should. I want to ignore those lines from the rule, but I can't figure out the node that should apply. Node types are specified in

问题 Is it a good practice to use the ternary operator for this: answersCounter = answer.length != 0 ? ++answersCounter : answersCounter; This is a question that I always asked myself as it happens quite often. Or is it better to use a normal if statement. For me this looks much cleaner in one line. 回答1: This is just opinion, but I think that writing the increment like you have it is somewhat poor style. Assigning a variable to a pre-incremented version of itself is a little bit confusing. To me,

问题 I just shoot myself in the foot and would like to know whether there were actual reasons to make this situation possible. And anyway, this question can stay for the convenience of the future foot shooters. Suppose we have a nullable value in vb.net: Dim i as Integer? We want to assign a value to it, basing on a condition, and using a ternary operator, because it's so neat and stuff: i = If(condition(), Nothing, 42) That is, if a condition is true , employ the nullability, otherwise the value.

问题 I used to program in Objective-C all the time and I am new to Swift. This error Xcode gives me really confuse me. func renderBufferAreaBAUp(yOffset: CGFloat, amount: CGFloat, ifLeft: Bool) { var topViewIndexForIndexAdjust = ifLeft?leftTopIndex:rightTopIndex } On this line I intended to use ternary. leftTopIndex and rightTopIndex are both Int type. However Xcode gives me those on this particular line, Consecutive statements on a line must be separated by ';' Expected expression Can anybody

问题 I used to program in Objective-C all the time and I am new to Swift. This error Xcode gives me really confuse me. func renderBufferAreaBAUp(yOffset: CGFloat, amount: CGFloat, ifLeft: Bool) { var topViewIndexForIndexAdjust = ifLeft?leftTopIndex:rightTopIndex } On this line I intended to use ternary. leftTopIndex and rightTopIndex are both Int type. However Xcode gives me those on this particular line, Consecutive statements on a line must be separated by ';' Expected expression Can anybody

问题 I know we are able to use ternary for attr but I am wondering if we can do it with plain text? let's say I have something like this button.btn.btn-round.btn-info | if image | Change Image else | Add Image the button will have the text either Change Image or Add image if image variable exists Is this possible to use ternary? Thanks in advance for any help and suggestions 回答1: Yes, it's absolutely possible. Just use the equals sign at the end of the element definition to get pug to evaluate

问题 Is there difference between ternary operator and if condition in php ? if yes, kindly provide. 回答1: The ternary operator is an operator , so it forms an expression. So it will have a value that you can assign to a variable or use however you want. It is used for simple situations where a variable can take two possible values depending on a condition. For example: $status = $age > 18 ? 'adult' : 'child'; Although possible, you should not nest the ternary operator. The control structure if is

问题 How to write the following condition with a ternary operator using C++ int condition1, condition2, condition3; int / double result; //int or double .... std::cout << ( condition1: result1 : "Error" ) << ( condition2: result2 : "Error" ) << ( condition3: result3 : "Error")...; 回答1: Depends on what type is result1, result2 etc. expressionC ? expression1 : expression2 isn't valid for all types of expression1 and expression2 . They must necessarily be convertible to a common type, roughly