object

问题 Originally, I was rendering components by using this code to map an array of objects( [{}, {}, {}] ): let todoComponents = allTodos.map(item => <Todos key={item.id} item={item} handleChange={handleChange}/>) However, this does not work on a separate project where I am getting data from Firebase with a different data structure. In it, each object has a unique name. [{ "-M8CpcbvDriZpw4sc4IW" : { "completed" : false, "id" : "-M8CpcbvDriZpw4sc4IW", "text" : "Get Comic Book" }, "-M8Cpku0PCNu0

问题 I want to compare the results I get back from filling out a form to the properties returned from json. I am not sure about how to go over that. This is what I have so far: $('#btn').on('click', function() { let $inputs = $('#new_form :input'); let new_vals = {}; $inputs.each(function() { new_form[this.id] = $(this).val(); }); console.log(new_vals); $.getJSON(api, function(data) { data.forEach(d => { console.log(d.values); }); }); }); My console.log() for new_vals : {start_date: "2019-12-25",

问题 I'm struggling with interfaces. Consider this: type Generatorer interface { getValue() // which type should I put here ? } type StringGenerator struct { length int } type IntGenerator struct { min int max int } func (g StringGenerator) getValue() string { return "randomString" } func (g IntGenerator) getValue() int { return 1 } I want the getValue() function to return a string or an int , depending on if it's called from StringGenerator or IntGenerator When I try to compile this, I get

问题 I'm struggling with interfaces. Consider this: type Generatorer interface { getValue() // which type should I put here ? } type StringGenerator struct { length int } type IntGenerator struct { min int max int } func (g StringGenerator) getValue() string { return "randomString" } func (g IntGenerator) getValue() int { return 1 } I want the getValue() function to return a string or an int , depending on if it's called from StringGenerator or IntGenerator When I try to compile this, I get

问题 I have two methods that return the following types Pick<T, K> and Omit<T, K> where Omit is type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>> . I have some trouble when it comes to removing multiple properties from an object. I have a method pickOne that selects one property from an object, a method pickMany that picks multiple properties from an object and a method omitOne that removes one property from an Object. I would like to have a OmitMany method to remove multiple

问题 I have two methods that return the following types Pick<T, K> and Omit<T, K> where Omit is type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>> . I have some trouble when it comes to removing multiple properties from an object. I have a method pickOne that selects one property from an object, a method pickMany that picks multiple properties from an object and a method omitOne that removes one property from an Object. I would like to have a OmitMany method to remove multiple

问题 I have two methods that return the following types Pick<T, K> and Omit<T, K> where Omit is type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>> . I have some trouble when it comes to removing multiple properties from an object. I have a method pickOne that selects one property from an object, a method pickMany that picks multiple properties from an object and a method omitOne that removes one property from an Object. I would like to have a OmitMany method to remove multiple

问题 In javascript there is object destructuring so we can break down objects and just use the end key if the intermidiate objects are resused multiple times. e.g) const person = { firstName: "Bob", lastName: "Marley", city: "Space" } So instead of calling person.<> to get each value we can destructure it like this console.log(person.firstName) console.log(person.lastName) console.log(person.city) Destructured: const { firstName, lastName, city } = person; And call like this: console.log(firstName

问题 I have an array of objects and I want to write them in a text file. So that I can later read the objects back in an array. How should I do it? Using Serialization. Deserialization is not working: public static void readdata(){ ObjectInputStream input = null; try { input = new ObjectInputStream(new FileInputStream("myfile.txt")); // getting end of file exception here } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } try { array =

问题 The only time I tried to use object was List<object> and I regretted it and rewrote it. I can never find an instance to use object rather than an interface. When does one use object in .NET? 回答1: Frankly, it doesn't happen often that you REALLY need it. But when you do, it's pretty obvious. Reflection, generic type casting, serialization or tagging are among topic that ends up having object around. It's like void* ... which in essence is almost the same. You wonder what's the use for such