In the Go language, while is not a keyword. You can use the for statement plus break to achieve the effect of a while loop, such as "for {sum if sum>10{break}else{...}}". The go language has 25 keywords such as break, default, func, select, case, defer, go, map, else, goto, for, if, var, etc.

The operating environment of this tutorial: Windows 7 system, GO version 1.18, Dell G3 computer.

There is no while keyword in golang, you can use for break to achieve it

Different from most languages, the loop statement in Go language only supports the for keyword, and The while and do-while structures are not supported. The basic usage of the keyword for is very close to that in C language and C:

sum := 0
for i := 0; i < 10; i++ {
sum += i
}

You can see that the biggest difference is that the conditional expression after for does not need to be used Surrounded by parentheses (), the Go language further takes into account infinite loop scenarios, so that developers do not have to write boring for(;;){} and do{} while(1); , and is directly simplified to the following writing:

package main

import "fmt"

func main() {
    sum := 0
    for {
        sum ++
        if sum > 10{
            break
        }else{
            fmt.Println(sum)
        }
    }
}

Keywords in the go language

Keywords (also called reserved words) are the programming language A sequence of characters reserved for use by programmers as an identifier.

Keywords are words that are given special meanings by the Go language and can also be called reserved words.

There are a total of 25 keywords in the Go language. The reason why the keywords in the Go language are deliberately kept so few is to simplify the code analysis during the compilation process. Like other languages, keywords cannot be used as identifiers.

##break Exit the loopdefaultSelect structure default items (switch, select)funcDefinition FunctioninterfaceDefine interfaceselectchannelcaseSelect structure tagchanDefine channelconstConstantcontinueSkip this loopdeferDelay execution Content (finishing work)goConcurrent executionmapmap typestructDefine structureelseSelect structuregotoJump statementpackagePackage##switch##fallthroughProcess controlifSelection structurerangeGet elements from slice, map and other structurestypeDefine the typeforLoopimportImport packagereturnReturnvarDefine variablesThe 25 keywords of Go can be used according to their functions Divided into 3 categories, namely package management, program entity declaration and definition, and program flow control.

Reserved keywords	Description
Selection structure

CategoryKeywordsProgram Statement import, packageProgram entity declaration and definitionchan, const, func, interface, map, struct, type, varProgram control flowgo, select, break, case, continue, default, defer, else, fallthrough, for, goto, if, range, return, switchNote: In the Go language, the declaration and definition of program entities are based on its data type system. For example, the keywords chan, func, interface, map and struct correspond to the Go language's composite data types Channel (channel), Function (function), Interface (interface), Map (dictionary) and Struct (structure) respectively.

There are 15 keywords in total for program control flow. Among them, go and select are mainly used for concurrent programming in Go language.

Recommended learning:

Golang tutorial

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