Golang Online Course

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2. CONTENT About Golang Designing principles Environment setup Program Structure Tokens Data types Constants Operators Decision making  Loop statements Function Scope Rules Arrays Structures Pointers  Range Recursion Type casting

3. ABOUT GOLANG Go is an open source programming language which was originally developed by Google in the year 2007 and Go programming language was designed by Robert Griesemer, Ken Thompson, and Rob Pike. The syntax of this language is similar to C programming language. Go provides type safety, garbage collection, dynamic typing capacity and some other advanced built-in types such as key-value maps and variable length arrays. 

4. DESIGNING PRINCIPLES This programming language support interfaces and type embedding. Go is simple, concise and safety. Most of the programmers prefer this GO programming language because the compilation time is very fast. Some of the built-in concurrency supports are the lightweight process, channels, select statement, and simplicity.

5. Environment setup The Go programming environment is already setup in online. The programmers can compile and execute your code through online configuration environment. The important software is text editor and the Go compiler. The text editor is used to write your code. Some of the commonly using text editors are notepad, brief, OS edit command, etc. The Go compiler is used to change the source code into machine language only then the CPU can understand and execute the program, as per the instructions were given.

6. Program structure  A complete Go language must have the following sections such as functions, variables, import packages, package declaration, comments, and statements & expressions. example package main import "fmt" func main() { /* This is my first sample program. */ fmt.Println("Hello, World!") }

7. Tokens  Go programming language has various tokens. A token may be a keyword, constant, symbol, string literal, identifier.

8. Data types  Boolean types: it has two predefined constants such as true and false. String types: string is nothing but the set of characters usually declared within “ ”. Numeric types: Numeric data type means the arithmetic types of values are stored in variables. Derived data types: there are many derived data types available in Go programming language.

9. Constants Constant is nothing but the fixed value. Once the programmer set a value as constant, then it will be changed during the time of execution. The fixed values are often referred as literals. The literals may be the data types such as integer constant, the character constant, floating constant, and the string constant.

10. Operators There are various operators in Go programming language which are used to perform mathematical and logical operations using operands Types of operator:arithmetic operator, bitwise operator, assignment operator, misc operator, logical operator, and relational operator.

11. Decision making Decision making structures are used by the programmer when they want to test one or more conditions. If the given condition is true, some set of statements is executed sequentially. Suppose if the condition is false, some other statements are executed. This is done to attain a particular task.

12. Loop Statement The loop statements are used to perform the same task for multiple times. There are various types of loop statements available in Go programming language are for loop and nested loop. The loop control statements such as continue statement, break statement, and goto statement.

13. Function A function is nothing but the collection of statements working together to attain a particular task. A perfect function includes some parts such as return type, function name, parameters, and function body. The function is also called as the method, sub routine, and procedure. While declaring the function, the developer has to start with func keyword.

14. Scope The variables are declared in three places in a program. If the variables are declared within the function, then it is called as local variables, and those variables are accessed only by the statements inside the function. If the variables are declared outside the function, then it is referred as global variables. Those variables are usually declared at the top of the program.

15. Arrays The array is the data structure provided by the Go programming language, and the array is nothing but the collection of similar data types. In Array, memory allocation is in a contiguous manner. The lowest address is the first element, and the higher order address is the last element in the array.

16. Structures The structure is also a user defined data type and structure is the collection of various data types. Structure concept is frequently used to present a record. The lowest address is the first element, and the higher order address is the last element in the array. Format of structure type struct_variable_type struct { member definition; member definition; ... member definition; }

17. Pointers The pointer is a variable which is used to store the address value of another variable. Some of the complex tasks are easily performed using pointer concept. Example package main import "fmt" func main() { var a int = 10 fmt.Printf("Address of a variable: %x\n", &a ) }

18. Range The range keyword is used in for loop to iterate the items of slice, channel, array and map. For array and slices, it returns the index value as the integer. For the map, it returns the key of following key value pair.

19. Recursion Go language supports the recursion function which means the function call by itself. While using the recursive function, the programmers should be careful to define the exit condition. func recursion() { recursion() /* function calls itself */ } func main() { recursion() }

20. Type casting Using cast operator, the developer can convert a variable from one data type to another data type. Example: package main import "fmt" func main() { var sum int = 17 var count int = 5 var mean float32 mean = float32(sum)/float32(count) fmt.Printf("Value of mean : %f\n",mean) }

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