immutable infrastructure

Disclaimer: this blog is an original blog and cannot be reproduced without permission! If you see it in other places, it is recommended to take a look at csdn (the original link for the http://blog.csdn.net/bettarwang/article/details/26744661), read the code and ask questions, discussion is more convenient. In Java, final is mainly used in three aspects: Variable modification, modification method and modification class. The role of final is explained in the following two aspects. At the end of t

Immutable.js provides several methods to iterate over an immutable.map (). These also apply to the other immutable structures found within the Immutable.js family, such as Set and List. The primary methods is map and ForEach, but we'll also cover filter and GroupBy.// map () return todos.map (todo = { return todo.text }); // filter () return todos.filter (todo = { return todo.completed; }) // groupBy ()--return new immtuable Map return to

a=10;B=a;b=15;Print (ID (a))Print (ID (b))The computer allocates a memory space to the 10 object. Its memory address is 1766916848.Then a this variable points to the memory address.Because of B=a, B also points to this memory address.b=15; the computer also assigns a memory address to the 15 object, and B points to the 15 memory address.1766916848 The value inside this memory address will not be changed. If there is not a variable pointing to the memory address, then the memory address will be f

Python Basics-Basic data type (number (numeric) string (string) list (list) Tuple (tuple) sets (collection) Dictionary (dictionary))There are six standard data types in the Python3:Number (numeric)String (String)List (lists)Tuple (tuple)Sets (collection)Dictionary (dictionary)Among the six standard data types of Python3:Immutable data (four): Number, String (string), tuple (tuple), sets (set);Variable data (two): List, Dictionary (dictionary).Python3

Python Basics-Basic data type (number (numeric) string (string) list (list) Tuple (tuple) sets (collection) Dictionary (dictionary))There are six standard data types in the Python3:Number (numeric)String (String)List (lists)Tuple (tuple)Sets (collection)Dictionary (dictionary)Among the six standard data types of Python3:Immutable data (four): Number, String (string), tuple (tuple), sets (set);Variable data (two): List, Dictionary (dictionary).Python3

In this lesson, you'll learn what mutable and immutable objects is, and the difference between them. This understanding is determine when objects can is modified in place, and when new objects must is created.List is mutable, which means everytime it returns the same-ID whether or not you have changed it:Foo =// samefoo.append (3// sameImmtuable such as String:str = "Hello"// not the samestr = ' world '// not the same[Python] Understand Mutable vs.

Advanced Research Course in engineering infrastructure industry for excellence in objectives and performance management Outline(three- Day Combat Edition)(If you want to disclose the following, or you need to make a professional adjustment of the outline, please contact me to confirm)"Course keywords" performance management cycle, work plan, MBO\KPI\BSC, corporate culture"Course duration" 3 days (estimated 6.5 hours per day)"Course object" business le

Directory: Autodesk Infrastructure Map Server (AIMS)/MapGuide API training materials-Chapter 2 Autodesk Infrastructure Map Server (AIMS)/MapGuide API training materials-Chapter 2 Autodesk Infrastructure Map Server (AIMS)/MapGuide API training materials-Chapter 2 Autodesk Infrastructure Map Server (AIMS)/MapGuide API tr

The Internet has undergone dramatic changes over the past decade. However, in the enterprise data center, the changes are not very big. IT administrators still need to spend time managing the "island-style" IT systems, and the deployment and configuration of IT infrastructure is still relatively difficult, in addition, the energy consumption continues to rise. As a result, Converged Infrastructure (CI) has

Given a 2D matrixMatrix, Find the sum of the elements inside the rectangle defined by its upper left corner (Row1,Col1) and lower right corner (Row2,Col2 ). The above rectangle (with the red border) is defined by (row1, col1) = (2, 1) and (row2, col2) = (4, 3 ), which Contains sum = 8. Example: Given matrix = [[3, 0, 1, 4, 2], [5, 6, 3, 2, 1], [1, 2, 0, 1, 5], [4, 1, 0, 1, 7], [1, 0, 3, 0, 5] sumregion (2, 1, 4, 3) -> 8 sumregion (1, 1, 2, 2)-> 11 sumregion (1, 2, 2, 4)-> 12 Question Give

; - - if(Row1 = =0 col1 = =0)returnMatrix[row2][col2]; - if(Row1 = =0)returnMATRIX[ROW2][COL2]-Matrix[row2][col1-1]; - if(col1 = =0)returnMATRIX[ROW2][COL2]-Matrix[row1-1][col2]; - in returnMATRIX[ROW2][COL2]-Matrix[row1-1][COL2]-Matrix[row2][col1-1] + Matrix[row1-1][col1-1]; - } to } + - the //Your Nummatrix object would be instantiated and called as such: * //Nummatrix Nummatrix = new Nummatrix (matrix); $ //nummatrix.sumregion (0, 1, 2,

Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by it upper left corner ( row1, Col1) and lower right corner ( row2, Col2). The above rectangle (with the red border) are defined by (row1, col1) = (2, 1) and (Row2, col2) = (4, 3), which contains Su m = 8.Example:Given matrix = [ [3, 0, 1, 4, 2], [5, 6, 3, 2, 1], [1, 2, 0, 1, 5], [4, 1, 0, 1, 7], [1, 0, 3, 0, 5]] Sumregion (2, 1, 4, 3), 8sumRegion (1, 1, 2, 2), 11sumRegion (1, 2, 2,

Given an integer array nums, find the sum of the elements between indices I and J (i ≤ J), inclusive.Example:Given nums = [-2, 0, 3, -5, 2, -1]sumrange (0, 2), 1sumRange (2, 5), -1sumrange (0, 5), 3Note: Assume that the array does is not a change. There is many calls to sumrange function. Prefix and the application, very simple.classNumarray { Public: intN; Vectorint>s; Numarray (Vectorint> nums) {N=nums.size (); if(n==0)return; S.push_back (nums[0]); for(intI=1; i) {S.push

Given an integer array nums, find the sum of the elements between indices I and J (i ≤ J), inclusive.Example:Given nums = [-2, 0, 3,-5, 2,-1]Sumrange (0, 2)--1Sumrange (2, 5)-1Sumrange (0, 5)-3Note: Assume that the array does is not a change. There is many calls to sumrange function. Problem Solving Ideas:The simplest dynamic programming. Complexity:numarray o (n) sumrange O (1)To solve the boundary problem, establish ACCU = new int[nums.length+1] accu[i] to represent nu

Immutable stringCreate a String objectnsstring *string = [[nsstring alloc] initwithformat:@ "Zhong Huang-"]; nsstring *string1 = [[nsstring alloc] initwithformat:@ "Zhonger ' s is% D ", "; nsstring *string2 = [[nsstring alloc] initwithformat:@ "Zhonger ' s gender is%@" ,@ " ominous "]; nsstring *string3 = @ "I love IOS"; gets the length of the stringunsigned long length = [string2 length]; get the characters in a string u

I. Title DescriptionGiven an integer array nums, find the sum of the elements between indices i and J (I≤J), inclusive.Example:Givennums = [-2, 0, 3, -5, 2, -1]sumRange(0, 2) ->1sumRange(2, 5) -> -1sumRange(0, 5) -> -3Two. Topic analysisGiven an array, the sum of the subscripts nums i and the j elements between them is assumed to i be less than or equal, and the j array nums is generally invariant.This problem should not look at the hint can think of a better than the method of violence, in the

When learning. NET programming, you must have heard that the system. string class is an immutable string, that is, you cannot modify the value of a string. For exampleCode String S = " Hello " ;S = " World " ; Instead of changing the value of S to world, you generate a new string containing "world", and then reference the string "S" to a new string, the original string is discarded. It is based on the unmodifiabl

Life goes beyond Python!The previous blog share with you a list of the drudgery in Python. There are many things we can do to modify the list.What we are going to share today is another sequence, but it cannot be modified, that is, the tuple, which is enclosed in parentheses .Separate values with commas, automatically creating tuples>>>1, 2, 3(1, 2, 3)Empty tuple>>>（）()A tuple that contains a value that must be comma->>>3333>>>(33)33>>>33,(33,)tuple functionBasically the same as the list functio

1. Features of the array:1) can store multiple data;2) The type of multiple data stored is the same;3) The data stored in the array is very easy to manage;2. When to use arraysWhen we have more than one type of data, and the meaning of the data is the same, you need to store it, you can use the array;=================== Nsarray ====================Ordered collection of objects. Immutable (Cannot add or remove objects to it once it ' s created)Importan

1. Requirement of String Pool String pool (String intern pool) is a special storage area in Method Area. when a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference. The following code will create only one string object in the heap. String string1 = "abcd";String string2 = "abcd"; Here is how it looks:Private int hash; // this is used to cache hash code. 3