shorthand

Is it possible to pass arbitrary number of named default arguments to a Python function conditionally ? For eg. there's a function: def func(arg, arg2='', arg3='def') Now logic is that I have a condition which determines if arg3 needs to be passed, I can do it like this: if condition == True: func('arg', arg2='arg2', arg3='some value') else: func('arg', arg2='arg2') Question is, can I have a shorthand like: func('arg', 'arg2', 'some value' if condition == True else # nothing so default gets picked ) The only way I can think of would be func("arg", "arg2", **({"arg3": "some value"} if condition

I've been programming in PHP for years now, but I've never learned how to use any shorthand. I come across it from time to time in code and have a hard time reading it, so I'd like to learn the different shorthand that exists for the language so that I can read it and start saving time/lines by using it, but I can't seem to find a comprehensive overview of all of the shorthand. A Google search pretty much exclusively shows the shorthand for if/else statements, but I know there must be more than just that. By shorthand, I am talking about stuff like: ($var) ? true : false; Click Upvote Here are

I'm wondering if there's a shorter way to write this: var x = 1; if(y != undefined) x = y; I initially tried x = y || 1 , but that didn't work. What's the correct way to go about this? var x = y !== undefined ? y : 1; Note that var x = y || 1; would assign 1 for any case where y is falsy (e.g. false , 0 , "" ), which may be why it "didn't work" for you. Also, if y is a global variable, if it's truly not defined you may run into an error unless you access it as window.y . As vol7ron suggests in the comments, you can also use typeof to avoid the need to refer to global vars as window.<name> :

ES6 introduced a shorthand notation to initialize objects with functions and properties. // ES6 shorthand notation const obj1 = { a(b) { console.log("ES6: obj1"); } }; // ES5 var obj2 = { a: function a(b) { console.log("ES5: obj2"); } }; obj2.a(); obj1.a(); new obj2.a(); new obj1.a(); However, these different notations behave differently, as you can see. If I do new obj1.a() in the browser (tested Chrome and Firefox), I get a TypeError: obj1.a is not a constructor . new obj2.a() behaves completely normally. What happens here? Does anyone have an explanation, and/or links to documentation

I do sometimes see abbreviations in properties for the getter. E.g. those two types: public int Number { get; } = 0 public int Number => 0; Can someone please tell me if there are any differences between those two. How do they behave? Are both of them read-only? Yes, both of them are read-only, but there is a difference. In the first one, there's a backing field which is initialized to 0 before the constructor is executed. You can change the value only in the constructor , just like a regular read-only field. The getter itself just returns the value of the field. In the second one, the getter

This question already has an answer here: What is the PHP shorthand for: print var if var exist 11 answers Is there a shorthand way to assign a variable to something if it doesn't exist in PHP? if(!isset($var) { $var = ""; } I'd like to do something like $var = $var | ""; hek2mgl Update for PHP 7 (thanks shock_gone_wild ) PHP 7 introduces the so called null coalescing operator which simplifies the below statements to: $var = $var ?? "default"; Before PHP 7 No, there is no special operator or special syntax for this. However, you could use the ternary operator: $var = isset($var) ? $var :

There are two types of if statements in java - classic: if {} else {} and shorthand: exp ? value1 : value2 . Is one faster than the other or are they the same? statement: int x; if (expression) { x = 1; } else { x = 2; } ternary operator: int x = (expression) ? 1 : 2; There's only one type of "if" statement there. The other is a conditional expression. As to which will perform better: they could compile to the same bytecode, and I would expect them to behave identically - or so close that you definitely wouldn't want to choose one over the other in terms of performance. Sometimes an if

So I'm using a shorthand javascript if / else statement (I read somewhere they're called Ternary statements?) this.dragHandle.hasClass('handle-low') ? direction = "left" : direction = "right" This works great, but what if later I want to use just a shorthand if , without the else portion. Like: direction == "right" ? slideOffset += $(".range-slide").width() is this possible at all? you can use && operator - second operand expression is executed only if first is true direction == "right" && slideOffset += $(".range-slide").width() in my opinion if(conditon) expression is more readable than