README
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Learn GOPL - Go Programming Language
This repository contain Go programs that I wrote while learning the language. My main study references are
Directories
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| Path | Synopsis |
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gopl_book
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ch1/dup1
dup programs reads the lines entered in the standard input and prints the text of the lines that appear more than once preceded by their count
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dup programs reads the lines entered in the standard input and prints the text of the lines that appear more than once preceded by their count |
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ch1/dup2
dup2 prints the count and text of lines that appear more than once in the input.
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dup2 prints the count and text of lines that appear more than once in the input. |
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ch1/dup3
The previous 2 versions of dup operate in a streaming mode in which input is read and broken into lines as needed, so in principle those programs can handle an arbitrary number of input.
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The previous 2 versions of dup operate in a streaming mode in which input is read and broken into lines as needed, so in principle those programs can handle an arbitrary number of input. |
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ch1/echo1
echo program prints on the console its command line arguments like the Unix echo command
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echo program prints on the console its command line arguments like the Unix echo command |
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ch1/echo2
This program illustrates a different variant of echo program
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This program illustrates a different variant of echo program |
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ch1/echo3
echo program using String Join function
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echo program using String Join function |
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ch1/exercise
Modify the echo program to print the index and value of each of its arguments, one per line
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Modify the echo program to print the index and value of each of its arguments, one per line |
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todd_udemy_course
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goplayground/application/JSONMarshal
Marshaling is the process of transforming the memory representation of an object to a data format suitable for storage or transmission, and it is typically used when data must be moved between different parts of a computer program or from one program to another.
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Marshaling is the process of transforming the memory representation of an object to a data format suitable for storage or transmission, and it is typically used when data must be moved between different parts of a computer program or from one program to another. |
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goplayground/application/bcrypt
bcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher.
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bcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. |
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goplayground/application/sort/customSort
To illustrate how to sort on fields in a struct using Sort func by implementing the sort package interface "Interface"
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To illustrate how to sort on fields in a struct using Sort func by implementing the sort package interface "Interface" |
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goplayground/application/sort/simpleSort
The sort package allows us to sort slices
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The sort package allows us to sort slices |
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goplayground/array
Main thing to note about arrays in Go is size is part of the type as illustrated below
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Main thing to note about arrays in Go is size is part of the type as illustrated below |
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goplayground/concurrency/atomic
Remember the Go Lang's Motto on Concurrency: "Share memory by communicating; Don't communicate by sharing memory."
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Remember the Go Lang's Motto on Concurrency: "Share memory by communicating; Don't communicate by sharing memory." |
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goplayground/concurrency/mutex
A “mutex” is a mutual exclusion lock.
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A “mutex” is a mutual exclusion lock. |
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goplayground/concurrency/raceCondition
Race condition occurs when two parallely executing entities try to access the same shared memory for read/write operation.
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Race condition occurs when two parallely executing entities try to access the same shared memory for read/write operation. |
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goplayground/exercises/ninjaL5Ex4
Write a program to demonstrate anonymous struct
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Write a program to demonstrate anonymous struct |
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goplayground/exercises/ninjaL6Ex1
create a func with the identifier foo that returns an int create a func with the identifier bar that returns an int and a string call both funcs print out their results
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create a func with the identifier foo that returns an int create a func with the identifier bar that returns an int and a string call both funcs print out their results |
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goplayground/exercises/ninjaL6Ex5
create a type SQUARE create a type CIRCLE attach a method to each that calculates AREA and returns it create a type SHAPE that defines an interface as anything that has the AREA method create a func INFO which takes type shape and then prints the area create a value of type square create a value of type circle use func info to print the area of square use func info to print the area of circle
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create a type SQUARE create a type CIRCLE attach a method to each that calculates AREA and returns it create a type SHAPE that defines an interface as anything that has the AREA method create a func INFO which takes type shape and then prints the area create a value of type square create a value of type circle use func info to print the area of square use func info to print the area of circle |
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goplayground/exercises/ninjaL6Ex8
Create a func which returns a func Assign the returned func to a variable Call the returned func
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Create a func which returns a func Assign the returned func to a variable Call the returned func |
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goplayground/exercises/ninjaL7Ex2
create a person struct create a func called “changeMe” with a *person as a parameter change the value stored at the *person address create a value of type person & print out the value Call changeMe function
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create a person struct create a func called “changeMe” with a *person as a parameter change the value stored at the *person address create a value of type person & print out the value Call changeMe function |
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goplayground/exercises/ninjaL9Ex1
In addition to the main goroutine, launch two additional goroutines
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In addition to the main goroutine, launch two additional goroutines |
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goplayground/functions/anonymous
Anonymous self executing functions
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Anonymous self executing functions |
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goplayground/functions/callback
Call function is a function that's passed into another function as an argument.
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Call function is a function that's passed into another function as an argument. |
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goplayground/functions/closures
Go functions may be closures.
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Go functions may be closures. |
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goplayground/functions/defer
A "defer" statement invokes a function whose execution is deferred to the moment the surrounding function returns, either because the surrounding function executed a return statement, reached the end of its function body, or because the corresponding goroutine is panicking.
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A "defer" statement invokes a function whose execution is deferred to the moment the surrounding function returns, either because the surrounding function executed a return statement, reached the end of its function body, or because the corresponding goroutine is panicking. |
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goplayground/functions/funcExpressions
Functions are first class types in Go.
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Functions are first class types in Go. |
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goplayground/functions/interfaceAndPolymorphism
In other words, what an interface tells a type is, "If you have methods that match my functions, then you are my type"
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In other words, what an interface tells a type is, "If you have methods that match my functions, then you are my type" |
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goplayground/functions/recursion
Recursion happens when a function calls itself.
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Recursion happens when a function calls itself. |
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goplayground/functions/returnFunc
Functions are first class types in Go and hence can be returned from a function just like any other type
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Functions are first class types in Go and hence can be returned from a function just like any other type |
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goplayground/functions/unfurlingSlice
When we have a slice of some type, we can pass in the individual values in a slice by using the “...” operator.
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When we have a slice of some type, we can pass in the individual values in a slice by using the “...” operator. |
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goplayground/functions/variadicFunction
We can create a function which takes an unlimited number of arguments Parameter that can accept unlimited number of arguments is known as a “variadic parameter.” We use the lexical element operator ...T to specify variadic parameter of type T
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We can create a function which takes an unlimited number of arguments Parameter that can accept unlimited number of arguments is known as a “variadic parameter.” We use the lexical element operator ...T to specify variadic parameter of type T |
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goplayground/iota
Within a constant declaration, the predeclared identifier iota represents successive untyped integer constants.
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Within a constant declaration, the predeclared identifier iota represents successive untyped integer constants. |
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goplayground/maps
Like slices, maps hold references to an underlying data structure.
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Like slices, maps hold references to an underlying data structure. |
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goplayground/methodSet
IMPORTANT: “The method set of a type determines the INTERFACES
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IMPORTANT: “The method set of a type determines the INTERFACES |
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goplayground/methods
Go function signature func (r receiver) identifier(parameters) (return(s)) { code }
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Go function signature func (r receiver) identifier(parameters) (return(s)) { code } |
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goplayground/pointers
A pointer is a variable that holds the address of a memory location
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A pointer is a variable that holds the address of a memory location |
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goplayground/slices/slice
A SLICE holds VALUES of the same TYPE.
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A SLICE holds VALUES of the same TYPE. |
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goplayground/strings2
* As we saw, indexing a string yields its bytes, not its characters: * a string is just a bunch of bytes.
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* As we saw, indexing a string yields its bytes, not its characters: * a string is just a bunch of bytes. |
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goplayground/struct
Structs allow us to compose together values of different types.
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Structs allow us to compose together values of different types. |
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goplayground/switch
* In Go, we don't need to add break in every switch case as we do in C/C++ * That's the default behavior.
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* In Go, we don't need to add break in every switch case as we do in C/C++ * That's the default behavior. |
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