2017年6月20日 · A Note on How this Works in Arrow Functions. One of the most handy features of an arrow function is buried in the text above: An arrow function... lexically binds the this value (does not bind its own this...) What this means in simpler terms is that the arrow function retains the this value from its context and does not have its own this.

2023年4月20日 · I have recently been studying UML and drawing simple diagrams with ordinary plain arrows between classes, but I know it's not enough. There are plenty of other arrows: generalization, realisation and etc. which have meaning to the diagram reader. Can I get an explanation on each arrow (ordinary, plain, dotted, diamond-filled, diamond)?

2013年1月17日 · The optional 'arrow' block was absent in Python 2 and I couldn't find any information regarding its meaning in Python 3. It turns out this is correct Python and it's accepted by the interpreter: def f(x) -> 123: return x I thought that this might be some kind of a precondition syntax, but: I cannot test x here, as it is still undefined,

Where could I find out what the arrow operator (->) means in the function heading? I guess purely logically, that the -> operator determines a type, that auto will be deduced to, but I want to get this straight.

The arrow operator is used to create lambda expressions, linking/separating parameters with the lambda body. syntax: (parameters) -> {expression}; It is also an efficient way of implementing functional interfaces like onClickListeners in java.

2018年3月24日 · an arrow from entity set to relationship set indicates a key constraint, i.e. injectivity: each entity of the entity set can participate in at most one relationship in the relationship set; Share Improve this answer

2024年6月2日 · The double arrow operator, =>, is used as an access mechanism for arrays (and also in many other cases explained in the answer below). This means that what is on the left side of it will have a corresponding value of what is on the right side of it in array context.

It is called the fat arrow (because -> is a thin arrow and => is a fat arrow) and also called a lambda function (because of other languages). Another commonly used feature is the fat arrow function ()=>something. The motivation for a fat arrow is: You don't need to keep typing function. It lexically captures the meaning of this.

2013年7月18日 · when I go to access myclass members through (->) arrow operator, I get the following error: base operand of '->' has non-pointer type 'myclass' but while I access class members through (.) operator, it works. These things make me confused. Why do I have to use the (.) operator for an array of class?

2010年4月4日 · I am reading a book called "Teach Yourself C in 21 Days" (I have already learned Java and C# so I am moving at a much faster pace). I was reading the chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions (like the equivalent of the .