In this post, we are going to see how to use Ramda Lens. For example, we have data: const {log} = require('./lib/log'); const R = require('ramda'); const band = { name: 'K.M.F.D.M', members: { current: [ {name: 'Sascha Konictzko', plays: ['vocals', '…

Getter on Object: 1. prop: R.prop(}); //=> 100 R.prop('x', {}); //=> undefined 2. props: R.props([, y: }); //=> [1, 2] R.props([, a: }); //=> [undefined, 1, 2] Setter ob Object: R.assoc(, {a: , b: }); //=> {a: 1, b: 2, c: 3} Another way to…

For example, in React application, we have initial state; const data = { nextId: 4, todoFilter: 'SHOW_ALL', todos: [ { id: 1, title: 'Hug Unicorn', completed: false }, { id: 2, title: 'Mess with Texas', completed: false }, { id: 3, title: 'Do Laundry…

In this lesson, we'll refactor a React component to use Ramda lenses to update our component state. We'll create a lens to focus on the property we want to target and use over to apply the existing state value to a utility function and we'll get back…

In this lesson we'll learn the basics of using lenses in Ramda and see how they enable you to focus changes on specific properties of an object while keeping your data immutable. what 'R.lens' do is able to get or set prop value but keep the object i…

Depth of Field 3.4 is a common postprocessing effect that simulates the properties of a camera lens. The name refers to the fact that the effect has had significant performance and feature improvements in Unity 3.4. 景深3.4特效是一种常见的模拟相机透镜的后处理特效.它的名字反映了在…

Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 二叉树的经典问题之最小深度问题就是就最短路径的节点个数,还是用深度优先搜索DFS来完成,万能的递归啊...请看代码: /** * Definition for binary tre…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 求二叉树的最大深度问题用到深度优先搜索DFS,递归的完美应用,跟求二叉树的最小深度问题原理相同.代码如下: C++ 解法一: class Solution { public: in…

problem description: Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. problem analysis: 第一步,设计演算法:遍历一棵树的方法有两种,BFS and DFS,思考了下,BFS是一圈一圈的扩张出…

题目简述: Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 解题思路: # Definition for a binary tree node # class TreeNode: # def __init__(self, x):…