Summary of loop statements in ruby and summary of ruby loop statements
While (when ...) Loop
While Condition Statement 1; Statement 2; statement... End
Single Row while LOOP
(Statement 1; Statement 2; statement... ) While Condition
Until (...)
During the past two days, when I was creating my own website blog, I encountered some problems with the $ post global variable when I was modifying the topic. Now make a point record.
========================================================== ========================================================== ===
Http://codex.wordpress.org/Global_Variables
This is the official global variable list of wp. All wp global variables are involved, but most of them are not explained in detail.
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Similar to the Python judgment statement, Python also has
Looping StatementsLike what
for,
whileWait, in
Looping Statements, if the condition set is not so accurate, it will enter the infinite loop, then the page will give the system error, or the computer will directly
crashes。
So what is a loop?
For example, to calculate 1+2+3, we can write an expression directly:
>>> 1 + 2 + 36
To calculate 1+2+3+...
This article mainly introduces the differences between the forin loop of js and the foreach loop in java. The example analyzes the use skills of the forin loop of js and explains the differences between the use of the foreach loop and that of Java, it has some reference value. If you need it, you can refer to the examp
Loop, loop English
Jquery's. each () loop can loop through arrays and objects in two ways. The second method is used to make the DOM loop structure simpler and more error-prone. It iterates every DOM element in the jQuery object. During each callback function execution, the
Sass Control Command (loop) and sass control command Loop
@ If@ IfA command is a SassScript that can process style Blocks Based on conditions. If the condition isTrueReturns a style block.FalseReturns another style block. In addition to @ if, Sass can also work@ Else ifAnd@ Else.
1 $lte7: true; 2 $type: monster; 3 .ib{ 4 display:inline-block; 5 @if $lte7 { 6 *display:inline; 7 *zoom
First, using the For loop structureTarget:This case requires writing a shell script chkhosts.sh that uses a for loop to detect the surviving status of multiple hosts, with the following requirements and instructions:1> Ping Detection of 192.168.4.0/24 network segments2> Ping Detection can refer to the pinghost.sh script of the preceding dayThe 3> script can traverse the ping hosts and feed back the survivin
Conditional statement and while LOOP, conditional statement while loopI. conditional statement if ...... Else
1. Basic if statement
Example:
If the age of a person is greater than or equal to 18, "adult" is output; otherwise, "not adult" is output"
#! /Usr/bin/env python #-*-coding: utf8-*-age_of_man = 20if age_of_man> = 18: print ("adult") else: print ("not adult ")
2. if supports nesting
If condition 1: indented code block elif condition 2: indented
Loop Structure and loop structure
Execution of cyclic statements
For Loop usage, such as printing an odd number between 1 and 10
Public class testFor {public static void main (String args []) {System. out. println ("loop start"); for (int I = 1; I
Process: first declare I as 0 and judge whether the I value is smalle
The application master run loop is responsible for handling all user-related events. The UIApplication object installs the main run loop when the app starts and uses this loop to handle events and handle view-based interface updates. As the name suggests, the main run loop is run in the app's main thread of the app ' s
These days with video learning node. js, encountering a lot of problems with asynchronous functions, the problem of callback values for asynchronous functions appearing in a For loop is now summarized as follows:
The specific problem is the code that iterates over the subfolders in the folder for the For loop wrapping the Async function:for (var i = 0; i The output is:wedding3wedding3wedding3The For
#python中, the While statement is used to loop the execution of a program that, under certain conditions, loops through a program to handle the same tasks that require repeated processing.#while是 the "as type" loop structure.I=1While iPrint (i,end= "")I+=1Sum=0I=1While iSum+=iI+=1ElsePrint ("\ n", sum)Print ("0+2+...+100=", sum)#从控制台录入一个数字, the factorial from 1 to the number;result=1;i=1;numa=0;Numa=int (Inp
There are three standard loops in the statements of the MySQL stored procedure: The while loop, the loop loop, and the repeat loop. There is also a non-standard way of cycling: GOTO, but this cycle is best not to use, it is easy to cause confusion in the program, here is a good introduction.
Today we'll take a look at
Python's data types are briefly described in the previous sections, and then we'll talk about Python's control-judgment loop.In real-world programming, we often use computers to help us do a lot of repetitive calculations, in which case, the machine can judge a condition, or a behavior to repeat the operationThen we have to know how to write a circular judgment statement.If ... else elif If that is the meaning, after the need to add a judgment condition, if the condition is true, then perform if
Infinite Loop ViewPager, loop ViewPagerCurrent situation
Without modifying the source code, when ViewPager slides to the last item, it cannot slide to the right. When ViewPager slides to the first item, he cannot move forward. (All the above are nonsense)Ideas
We can think like this, when sliding the last one, we let him jump to the first one, so that he can continue to slide back, so that we want the cycle
Two-dimensional array traversal and dom loop creation, two-dimensional array dom Loop
This is the first blog I posted. I am a newbie. If it is incorrect, do not try it.
Recently, I am writing a front-end technology about local storage of a shopping cart. Here we are about how to present the information inside a two-dimensional array on the page.
In general, local storage stores store information about store
In php, the foreach method jumps out of the current loop and ends the loop method. in PHP, the foreach () loop is used. when a condition is met, the method jumps out of this loop and continues the next loop, or terminate the foreach () l
Differences between the js for in loop and the foreach loop in java, jsforeach
This article analyzes the differences between the js for in loop and the foreach loop in java. Share it with you for your reference. The specific analysis is as follows:
The for in loop in js is d
Loop unwinding, also known as loop unrolling, is a loop transformation technique that attempts to optimize a program's execution speed at the expense of its binary size (space-time tradeoff ). the transformation can be undertaken manually by the programmer or by an optimizing compiler.
The goal of loop unwinding is to
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