Programmer Think

I am 3y, with one year of CRUD experience and ten years of markdown programmer 👨🏻‍💻 It is known as a high-quality eight part essay player all the year round Two days ago, I posted an article on data link tracking, leaving TODO at the end: the servers running applications are generally clusters, and the log data will be recorded on differ ...

1. De duplication of the same object in the array The reduce() method receives a function as an accumulator. Each value in the array is reduced from left to right and finally calculated as a value Syntax: array.reduce(function(total, currentValue, currentIndex, arr), initialValue) let arr = [{id:1},{id:2},{id:3},{id:1}] const hash = {} arr ...

scenario analysis Suppose the price of article a is 20.22 yuan / kg in 2000, 20.32 yuan / kg in 2001 and 21.01 yuan / kg in 2002. The middle price is omitted. Please predict the price of article a in 2022?This is a very simple linear regression case. We all know that we can predict the price in 2022 by drawing a straight line. So how to find ...

preface Almost every APP needs image selection and clipping function. Because it involves camera and storage, this function still needs to consider a lot of compatibility. This is why there are a lot of picture selection frameworks on github, but you will find that the picture selection framework found on github is not just picture selection. ...

Article source ｜ MS08067 red team training course No. 5Author: Shan (5 participants of red team training course)The idea of job is to realize the remote control of the control end (Server) to the controlled end (Client); In the job, we will use python code and java code to realize the controlled end, nc code and python code to realize the cont ...

1, MHA concept (1) MHA (MasterHigh Availability) is a set of excellent software for failover and master-slave replication in MySQL high availability environment. (2) The emergence of MHA is to solve the problem of MySQL single point. (3) During MySQL failover, MHA can automatically complete the failover operation within 0-30 seconds. (4 ...

P1926. Little schoolboy - question brushing Army subject Topic background Mathematics is fire, lighting up the lamp of physics; Physics is a lamp, illuminating the way of chemistry; Chemistry is the road leading to the pit of biology; A creature is a pit, burying a man of reason. Classical Chinese is fire, lighting up the palace lamp of hist ...

summary 1 string String is a container type data type (sequence), with 'or' 'or' 'or' 'as the container tag Each independent symbol in the string is an element of the string The string is immutable; Strings are ordered (subscript operation is supported) Element of string: each symbol in quotation marks is an element of string. The el ...

catalogue   1, spring+dubbo case integration 1. The project structure is as follows 2. dubbo service / consumption configuration 2, spring+dubbo portal analysis 1. dubbo dependency configuration 2. DubboNamespaceHandler analysis 2.1 dubbo common labels  2.2 dubbo label analysis  2.3 specific analysis 1, spring+dubbo case integration ...

reason After starting raspberry pie, you must want to toss all kinds of things on raspberry pie like me. Among them, you must have the idea of using the public IP of broadband distribution. The most direct way to use public IP is to use raspberry pie as a router, but raspberry pie 4B has only one gigabit network port, so this is the theme of t ...