closures

问题 In laravel 4, I could push a closure onto the queue with queue::push(function...) , but this no longer works in laravel 5. Instead, it appears that I have to make a custom Job class for every function that I want to push onto the queue. Since the functions I want to be pushing are only a couple of lines long, and are only ever used in exactly one place, it really seems like a waste of time and space to be writing up a full class for every case. The best "solutions" I can currently think of,

问题 In laravel 4, I could push a closure onto the queue with queue::push(function...) , but this no longer works in laravel 5. Instead, it appears that I have to make a custom Job class for every function that I want to push onto the queue. Since the functions I want to be pushing are only a couple of lines long, and are only ever used in exactly one place, it really seems like a waste of time and space to be writing up a full class for every case. The best "solutions" I can currently think of,

问题 const makeIncrementer = s=>a=>a+s makeIncrementer(10).toString() // Prints 'a=>a+s' which would make it impossible to de-serialize correctly (I would expect something like a=>a+10 instead. Is there a way to do it right? 回答1: This is a great question. While I don't have a perfect answer, one way you could get details about the argument/s is to create a builder function that stores the necessary details for you. Unfortunately I can't figure out a way to know which internal variables relate to

问题 Consider this small snippet of JavaScript: for(var i in map.maps) { buttons.push($("<button>").html(i).click(function() { alert(i); })); } It creates one button for each of the fields in the map.maps object (It's an assoc array). I set the index as the button's text and set it to alert the index as well. Obviously one would expect all the buttons to alert it's own text when clicked, but instead all the buttons alert the text of the final index in the map.maps object when clicked. I assume

问题 I'm analysing OptionsManager.Get(string name): /// <summary> /// Returns a configured <typeparamref name="TOptions"/> instance with the given <paramref name="name"/>. /// </summary> public virtual TOptions Get(string name) { name = name ?? Options.DefaultName; if (!_cache.TryGetValue(name, out TOptions options)) { // Store the options in our instance cache. Avoid closure on fast path by storing state into scoped locals. IOptionsFactory<TOptions> localFactory = _factory; string localName =

问题 I'm learning javascript by reading "Eloquent Javascript" and am confused by the "Closures" section in chapter 3 (Functions). In previous sections I learned about arrow functions, and how they can be used as anonymous functions. My initial thoughts were that this is an anonymous function example and I am simply not familiar yet. In particular, I am confused on what "() => local" does to/for return. function wrapValue(n) { let local = n; return () => local; } let wrap1 = wrapValue(1); let wrap2

问题 I'm learning javascript by reading "Eloquent Javascript" and am confused by the "Closures" section in chapter 3 (Functions). In previous sections I learned about arrow functions, and how they can be used as anonymous functions. My initial thoughts were that this is an anonymous function example and I am simply not familiar yet. In particular, I am confused on what "() => local" does to/for return. function wrapValue(n) { let local = n; return () => local; } let wrap1 = wrapValue(1); let wrap2

问题 I'm learning javascript by reading "Eloquent Javascript" and am confused by the "Closures" section in chapter 3 (Functions). In previous sections I learned about arrow functions, and how they can be used as anonymous functions. My initial thoughts were that this is an anonymous function example and I am simply not familiar yet. In particular, I am confused on what "() => local" does to/for return. function wrapValue(n) { let local = n; return () => local; } let wrap1 = wrapValue(1); let wrap2

问题 I'm learning javascript by reading "Eloquent Javascript" and am confused by the "Closures" section in chapter 3 (Functions). In previous sections I learned about arrow functions, and how they can be used as anonymous functions. My initial thoughts were that this is an anonymous function example and I am simply not familiar yet. In particular, I am confused on what "() => local" does to/for return. function wrapValue(n) { let local = n; return () => local; } let wrap1 = wrapValue(1); let wrap2

问题 whenever I use a trailing closure on an action ... example: run(SKAction.wait(forDuration: 10)){timeRemains = false} I’m seeing this: Reference to property ( anything ) in closure requires explicitly ‘self’ to make capture semantics explicit. What does this mean? And what is it on about? I'm curious because I'm only ever doing this in the context/scope of the property or function I want to call in the trailing closure, so don't know why I need `self and fascinated by the use of the word