boolean

问题 I've seen a function that looks something like this: function { [CmdletBinding()] [OutputType([Boolean])] param ( [bool] $param } # ... } What is the difference here between Boolean and bool ? 回答1: [bool] is a powershell type accelerator: https://4sysops.com/archives/using-powershell-type-accelerators/ I'm in powershell 7. If it's officially documented somewhere, I can't find it (besides Windows Powershell in Action, as usual). [psobject].Assembly.GetType("System.Management.Automation

问题 I've seen a function that looks something like this: function { [CmdletBinding()] [OutputType([Boolean])] param ( [bool] $param } # ... } What is the difference here between Boolean and bool ? 回答1: [bool] is a powershell type accelerator: https://4sysops.com/archives/using-powershell-type-accelerators/ I'm in powershell 7. If it's officially documented somewhere, I can't find it (besides Windows Powershell in Action, as usual). [psobject].Assembly.GetType("System.Management.Automation

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . Unfortunately the snippet of code below is not functioning as it should. It's attached to a JLabel so that when clicked, notices whether PlayerOne or

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . Unfortunately the snippet of code below is not functioning as it should. It's attached to a JLabel so that when clicked, notices whether PlayerOne or

问题 I just started learning java, tried to find the answer but I guess I'm not smart enough. I'm trying to write an array which I got from some file into another file. The problem is when I'm trying to make "while" it's saying cannot convert from int to boolean. Can anyone suggest something. Thank you in advance. This is what I have : public void savethefile() throws IOException{ File file1= new File("lala.ppm"); FileWriter save=new FileWriter(file1); save.write(tytul); while(i){ save.write

问题 As a primitive version of Optional*, Java 1.8 provides OptionalInt, OptionalLong and OptionalDouble. But I cannot find the equivalent OptionalBoolean class. Are there any technical reasons against having an OptionalBoolean ? * An Optional may or may not have the presence of a value, is used as an alternative to null . 回答1: This quote explains the considerations behind having primitive streams. I'm assuming the same applied to primitive Optionals. In short, primitive streams (and probably

问题 I print a bool to an output stream like this: #include <iostream> int main() { std::cout << false << std::endl; } Does the standard require a specific result on the stream (e.g. 0 for false )? 回答1: The standard streams have a boolalpha flag that determines what gets displayed -- when it's false, they'll display as 0 and 1 . When it's true, they'll display as false and true . There's also an std::boolalpha manipulator to set the flag, so this: #include <iostream> #include <iomanip> int main()

问题 I print a bool to an output stream like this: #include <iostream> int main() { std::cout << false << std::endl; } Does the standard require a specific result on the stream (e.g. 0 for false )? 回答1: The standard streams have a boolalpha flag that determines what gets displayed -- when it's false, they'll display as 0 and 1 . When it's true, they'll display as false and true . There's also an std::boolalpha manipulator to set the flag, so this: #include <iostream> #include <iomanip> int main()

问题 According to the docs the delete operator should be able to delete properties from objects. I am trying to delete properties of an object that are "falsey". For example, I assumed the following would remove all of the falsey properties from testObj but it does not: var test = { Normal: "some string", // Not falsey, so should not be deleted False: false, Zero: 0, EmptyString: "", Null : null, Undef: undefined, NAN: NaN // Is NaN considered to be falsey? }; function isFalsey(param) { if (param

问题 According to the docs the delete operator should be able to delete properties from objects. I am trying to delete properties of an object that are "falsey". For example, I assumed the following would remove all of the falsey properties from testObj but it does not: var test = { Normal: "some string", // Not falsey, so should not be deleted False: false, Zero: 0, EmptyString: "", Null : null, Undef: undefined, NAN: NaN // Is NaN considered to be falsey? }; function isFalsey(param) { if (param