map-function

问题 Given a pattern and a string str , find if str follows the same pattern. Here follows means a full match, such that there is a bijection between a letter in pattern and a non-empty word in str . Examples: pattern = "abba" , str = "dog cat cat dog" should return true; dog is a , cat is b and the words form the abba pattern. pattern = "abba" , str = "dog cat cat fish" should return false; the string follows a abbc pattern instead. My solution works in Python 2: def wordPattern(self, pattern,

问题 I want to render items from props, I can do it with initial state, but not with response from server. My render function : const { data } = this.props; return ( <div > {data.map((item, index) => <div key={index} className="row"> <span data = { data } className="number col-4 col-md-8">{item._id}</span> <span data = { data } className="date col-4 col-md-2">{item.date}</span> <span data = { data } className="tag col-4 col-md-2">{item.tag}</span> <div className="col-md-12 "> {item.text} </div> <

问题 I want to render items from props, I can do it with initial state, but not with response from server. My render function : const { data } = this.props; return ( <div > {data.map((item, index) => <div key={index} className="row"> <span data = { data } className="number col-4 col-md-8">{item._id}</span> <span data = { data } className="date col-4 col-md-2">{item.date}</span> <span data = { data } className="tag col-4 col-md-2">{item.tag}</span> <div className="col-md-12 "> {item.text} </div> <

问题 I've got an array of objects. Some of them have a wordpress_parent prop with a value `. This means this node is a child of another node. The actual end result is a nested comment UI, so there can be multiple levels of children. I'd like to loop through my objects and where wordpress_parent !== 0 , find the object in the original array whose wordpress_id equals the value of wordpress_parent and put that object as a child property of the matching parent node. I want to achieve this object form:

问题 I've got an array of objects. Some of them have a wordpress_parent prop with a value `. This means this node is a child of another node. The actual end result is a nested comment UI, so there can be multiple levels of children. I'd like to loop through my objects and where wordpress_parent !== 0 , find the object in the original array whose wordpress_id equals the value of wordpress_parent and put that object as a child property of the matching parent node. I want to achieve this object form:

问题 I have shopping Application in REACT js. Im displaying all products using .map() function, and also showing "ADD to CART" button infront of each product. When ADD to Cart btn is clicked, it adds the clicked product ID in local storage then I display these selected products in Shopping Cart by retrieving IDs from localStorage . It all works fine . Now what I wanted is to disable the "ADD to Cart" button(for selected product only) when its clicked Once. I did it by setting state but it actually

问题 Assuming I have lots of functions or methods with receiver, each of which has different type of parameters. I want to use table-driven method to dispatch function or method call. So I'll construct a table like this: type command struct { name string handler func(parameter ...interface{}) // I don't know whether to use `...interface{}` is correct } table := map[string]command { ... } func (c command)foo(f1 int, f2 string) {} func (c command)bar(b1 bool, b2 int, b3 string) {} // methods and so

问题 as I had been looking for ways to optimize a password cracker I had been making, I came across a much shorter implementation of all possible character combinations in a list, which used this function: mapM (const xs) [1..n] where xs could be the characters available, and n the length of the desired words. so mapM (const "abcd") [1..4] would output a list ["aaaa","aaab","aaac","aaad","aaba","aabb"..] and so on. Only the length matters for the list of th right, I could have written ['f','h','s'

来源： https://stackoverflow.com/questions/63547939/haskell-how-to-create-a-maptree-function-based-on-a-foldr-of-a-binarytree

来源： https://stackoverflow.com/questions/63547939/haskell-how-to-create-a-maptree-function-based-on-a-foldr-of-a-binarytree