ternary-operator

Short form for Java if statement

由 泄露秘密 提交于 2019-11-27 05:00:03
问题 I know there is a way for writing a Java if statement in short form. if (city.getName() != null) { name = city.getName(); } else { name="N/A"; } Does anyone know how to write the short form for the above 5 lines into one line? 回答1: Use the ternary operator: name = ((city.getName() == null) ? "N/A" : city.getName()); I think you have the conditions backwards - if it's null, you want the value to be "N/A". What if city is null? Your code *hits the bed in that case. I'd add another check: name =

VB.NET - Nullable DateTime and Ternary Operator

由 ぐ巨炮叔叔 提交于 2019-11-27 03:26:48
问题 I'm having problems with a Nullable DateTime in VB.NET (VS 2010). Method 1 If String.IsNullOrEmpty(LastCalibrationDateTextBox.Text) Then gauge.LastCalibrationDate = Nothing Else gauge.LastCalibrationDate = DateTime.Parse(LastCalibrationDateTextBox.Text) End If Method 2 gauge.LastCalibrationDate = If(String.IsNullOrEmpty(LastCalibrationDateTextBox.Text), Nothing, DateTime.Parse(LastCalibrationDateTextBox.Text)) When given an empty string Method 1 assigns a Null (Nothing) value to gauge

Ternary Operators. Possible for a one sided action?

由 吃可爱长大的小学妹 提交于 2019-11-27 03:19:37
问题 I've used ternary operators for a while and was wondering if there was a method to let say call a function without the else clause. Example: if (isset($foo)) { callFunction(); } else { } Now obviously we can leave out the else to make: if (isset($foo)) { callFunction(); } Now for a ternary How can you 'by pass' the else clause if the condition returns false? isset($foo) ? callFunction() : 'do nothing!!'; Either a mystery or not possible? 回答1: Short-circuit isset($foo) and callFunction();

Ternary operator in PowerShell

由 不羁的心 提交于 2019-11-27 03:12:44
From what I know, PowerShell doesn't seem to have a built-in expression for the so-called ternary operator . For example, in the C language, which supports the ternary operator, I could write something like: <condition> ? <condition-is-true> : <condition-is-false>; If that doesn't really exist in PowerShell, what would be the best way (i.e. easy to read and to maintain) to accomplish the same result? fbehrens $result = If ($condition) {"true"} Else {"false"} Everything else is incidental complexity and thus to be avoided. For use in or as an expression, not just an assignment, wrap it in $() ,

ORACLE IIF Statement

由 半城伤御伤魂 提交于 2019-11-27 03:02:54
问题 I get an error while writing the IIF stamtement, table and the statement given below, Statement: SELECT IIF(EMP_ID=1,'True','False') from Employee; Error: 00907-missing right parantheses CREATE TABLE SCOTT.EMPLOYEE ( EMP_ID INTEGER NOT NULL, EMP_FNAME VARCHAR2(30 BYTE) NOT NULL, EMP_LNAME VARCHAR2(30 BYTE) NOT NULL, EMP_ADDRESS VARCHAR2(50 BYTE) NOT NULL, EMP_PHONE CHAR(10 BYTE) NOT NULL, EMP_GENDER CHAR(1 BYTE) ) Please provide your inputs. 回答1: Oracle doesn't provide such IIF Function.

Troubleshooting “Unexpected T_ECHO” in ternary operator statement

由 南笙酒味 提交于 2019-11-27 02:34:11
问题 ($DAO->get_num_rows() == 1) ? echo("is") : echo("are"); This dose not seem to be working for me as intended, I get an error "Unexpected T_ECHO". I am expecting it to echo either 'is' or 'are'. I have tried it without the brackets around the conditional. Am I just not able to use a ternary operator in this way? The $DAO->get_num_rows() returns an integer value. 回答1: The Ternary operator is not identical to an if-then. You should have written it echo ($DAO->get_num_rows() == 1) ? "is" : "are";

JavaScript if alternative [duplicate]

由 我的梦境 提交于 2019-11-27 02:09:36
This question already has an answer here: Question mark and colon in JavaScript 7 answers What does this bit of code represent? I know it's some kind of if alternative syntax... pattern.Gotoccurance.score != null ? pattern.Gotoccurance.score : '0' Update: What's the need for this sort of coding? Is this more efficient or just a shortened version with the same efficiency? CMS It is the conditional operator, it is equivalent to something like this: if (pattern.Gotoccurance.score != null) { pattern.Gotoccurance.score; } else { '0'; } But I think that an assignment statement is missing in the code

If without else ternary operator

由 六月ゝ 毕业季﹏ 提交于 2019-11-27 02:02:29
问题 So far from I have been searching through the net, the statement always have if and else condition such as a ? b : c . I would like to know whether the if ternary statement can be used without else . Assuming i have the following code, i wish to close the PreparedStatement if it is not null (I am using Java programming language.) PreparedStatement pstmt; //.... (pstmt!=null) ? pstmt.close : <do nothing>; 回答1: No, you cannot do that. Instead try this: if(bool1 && bool2) voidFunc1(); 回答2: Why

ternary operator in matlab

由 房东的猫 提交于 2019-11-27 01:51:13
问题 is there a way of typing for if like: var = (cond) ? true : false; or do we have to use this format? if (cond) true else false end 回答1: MatLab doesn't have a ternary operator, or any other syntactic sugar for one-line if-statements. But if your if-statement is really simple, you could just write it in one line anyway: if (cond); casetrue(); else; casefalse(); end It's not as simple as ternary operator, but still better than writing it in 5 lines of code. 回答2: If you only need true or false,

Ternary operator VB vs C#: why resolves Nothing to zero?

由 六眼飞鱼酱① 提交于 2019-11-27 01:34:40
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. At which point the shooting occurs. For no apparent reason VB compiler decides that the common base
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