End of day 2
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0eea646621
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4
.idea/LearningGo.iml
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4
.idea/LearningGo.iml
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@ -0,0 +1,4 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module version="4">
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<component name="Go" enabled="true" />
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</module>
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@ -2,7 +2,7 @@
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/.idea/restapi.iml" filepath="$PROJECT_DIR$/.idea/restapi.iml" />
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<module fileurl="file://$PROJECT_DIR$/.idea/LearningGo.iml" filepath="$PROJECT_DIR$/.idea/LearningGo.iml" />
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</modules>
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</component>
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</project>
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@ -1,9 +0,0 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="WEB_MODULE" version="4">
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<component name="Go" enabled="true" />
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<component name="NewModuleRootManager">
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<content url="file://$MODULE_DIR$" />
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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100
dayone.go
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100
dayone.go
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package main
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import "fmt"
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var globalVariable = "this is a global variable"
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func printingExamples() {
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age := 69
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name := "Joe"
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//Print
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fmt.Print("hello, ") // does NOT add a new line
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fmt.Print("world! \n") // add new line manually
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fmt.Print("new line \n")
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//Println
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fmt.Println("Hello on one line!") // automatically adds new line
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fmt.Println("Good bye on one line!")
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//Passing multiple values
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fmt.Println("My age is", age, "and my name is", name)
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//Printf (formatted strings) %_ = format specifier - List of specifiers https://pkg.go.dev/fmt
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// Does NOT add a new line like fmt.Print()
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fmt.Printf("my age is %v and my name is %v \n", age, name) // %v takes any type of variables in the order they are provided
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fmt.Printf("My age is %q and my name is %q \n", age, name) // %q adds quotes around the variables in the order they are provided, must be strings!
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fmt.Printf("age is of type %T \n", age) // %T gets the type of the first variable passed after string to be printed
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fmt.Printf("You scored %f points! \n", 225.55) // %f passes a float value passed
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fmt.Printf("You scored %0.1f points! \n", 225.55) // %X.Xf rounds the passed float to the specified length
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// Sprintf (saved formatted strings)
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var sprintfVar = fmt.Sprintf("My age is %v and my name is %v \n", age, name)
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fmt.Println("The saved string is:", sprintfVar)
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}
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func dataTypesExamples() {
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// Date Types Doc https://go.dev/ref/spec#Types
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fmt.Println("-------------------------STRINGS-------------------------")
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// String docs https://go.dev/ref/spec#String_types
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// Three ways to initialize a variable
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var nameOne string = "mario"
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var nameTwo = "luigi"
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var nameThree string
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fmt.Println(nameOne)
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fmt.Println(nameTwo)
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fmt.Println(nameThree)
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fmt.Println("All three: ", nameOne, nameTwo, nameThree)
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nameOne = "peach"
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nameThree = "bowser"
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fmt.Println(nameOne, nameTwo)
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// Shorthand for variable initialization
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nameFour := "yoshi"
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fmt.Println(nameFour)
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// Numeric data types doc https://go.dev/ref/spec#Numeric_types
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fmt.Println("-------------------------INTS-------------------------")
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// ints
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var ageOne int = 20
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var ageTwo = 30
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ageThree := 40
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fmt.Println(ageOne, ageTwo, ageThree)
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// bits & memory
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// signed (positive and negative)
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var numOne int8 = 25 // -128 to 127
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var numTwo int16 = 35 // -32768 to 32767 (-32,768 to 32,767)
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var numThree int32 = 45 // -2147483648 to 2147483647 (-2,147,483,648 to 2,147,483,647)
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var numThreeAndAHalf rune = 45 // rune is the same as int32
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var numFour int64 = 55 // -9223372036854775808 to 9223372036854775807 (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807)
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fmt.Println(numOne, numTwo, numThree, numThreeAndAHalf, numFour)
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// unsigned (all positive)
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var posNumOne uint8 = 65 // 0 to 255
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var posNumTwo uint16 = 75 // 0 to 65535 (65,535)
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var posNumThree uint32 = 85 // 0 to 4294967295 (4,294,967,295)
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var posNumFour uint64 = 95 // 0 to 18446744073709551615 (18,446,744,073,709,551,615)
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fmt.Println(posNumOne, posNumTwo, posNumThree, posNumFour)
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fmt.Println("-------------------------FLOATS-------------------------")
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// decimal values default to float64
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var floatOne float32 = 25.98
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var floatTwo float64 = 9843216984654.68432168454651968
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floatThree := 6854324.6854654
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fmt.Println(floatOne, floatTwo, floatThree)
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}
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2
go.mod
2
go.mod
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module git.nevets.tech/Steven/gorestapi
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module git.nevets.tech/Steven/LearningGo
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go 1.19
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10
goofin.go
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10
goofin.go
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package main
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func divider(divider string) {
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endString := ""
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totalLength := 50
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length := len(divider)
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//TODO make this return a fixed size divider!
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}
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126
main.go
126
main.go
@ -1,106 +1,74 @@
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package main
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import "fmt"
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var globalVariable = "this is a global variable"
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import (
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"fmt"
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"sort"
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"strings"
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)
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func main() {
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dataTypesExamples()
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printingExamples()
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}
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fmt.Println("-------------------------ARRAYS-------------------------")
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func printingExamples() {
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age := 69
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name := "Joe"
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// Arrays in GOLang start at 0!!!
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//Print
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fmt.Print("hello, ") // does NOT add a new line
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fmt.Print("world! \n") // add new line manually
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fmt.Print("new line \n")
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// Three ways to initialize arrays
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// you can either define the length in the [x]type part
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// or let it determine the amount based on the number of entries given
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var ages [3]int = [3]int{16, 17, 18}
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var moreAges = [3]int{21, 22, 23}
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names := [4]string{"mario", "luigi", "peach", "yoshi"}
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//Println
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fmt.Println("Hello on one line!") // automatically adds new line
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fmt.Println("Good bye on one line!")
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fmt.Println(ages, len(moreAges), names) // len() function gets the length or size of array
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//Passing multiple values
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fmt.Println("My age is", age, "and my name is", name)
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// slices (use arrays under the hood)
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var scores = []int{100, 50, 60}
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scores[2] = 25
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scores = append(scores, 85)
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//Printf (formatted strings) %_ = format specifier - List of specifiers https://pkg.go.dev/fmt
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// Does NOT add a new line like fmt.Print()
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fmt.Printf("my age is %v and my name is %v \n", age, name) // %v takes any type of variables in the order they are provided
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fmt.Printf("My age is %q and my name is %q \n", age, name) // %q adds quotes around the variables in the order they are provided, must be strings!
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fmt.Printf("age is of type %T \n", age) // %T gets the type of the first variable passed after string to be printed
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fmt.Printf("You scored %f points! \n", 225.55) // %f passes a float value passed
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fmt.Printf("You scored %0.1f points! \n", 225.55) // %X.Xf rounds the passed float to the specified length
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fmt.Println(scores, len(scores))
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// Sprintf (saved formatted strings)
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var sprintfVar = fmt.Sprintf("My age is %v and my name is %v \n", age, name)
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fmt.Println("The saved string is:", sprintfVar)
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}
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// slice ranges
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rangeOne := names[1:3]
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func dataTypesExamples() {
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fmt.Println(rangeOne)
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// Date Types Doc https://go.dev/ref/spec#Types
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fmt.Println("-------------------------STANDARD-LIBRARY-------------------------")
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fmt.Println("-------------------------STRINGS-------------------------")
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// String docs https://go.dev/ref/spec#String_types
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// strings package
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// Three ways to initialize a variable
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var nameOne string = "mario"
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var nameTwo = "luigi"
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var nameThree string
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greeting := "hello there"
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fmt.Println(strings.Contains(greeting, "hello")) // strings.Contains returns a boolean value depending on if the passed value contains the second string
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fmt.Println(strings.Contains(greeting, "Hello")) // This function IS case-sensitive
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fmt.Println(nameOne)
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fmt.Println(nameTwo)
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fmt.Println(nameThree)
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fmt.Println("All three: ", nameOne, nameTwo, nameThree)
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fmt.Println(strings.ReplaceAll(greeting, "hello", "hi")) // Replaces all instances of the passed string
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fmt.Println("Original string value is", greeting) // the original value is unchanged
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fmt.Println(strings.ToUpper(greeting)) // returns the passed string all uppercase
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nameOne = "peach"
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nameThree = "bowser"
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fmt.Println(nameOne, nameTwo)
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fmt.Println(strings.Index(greeting, "ll")) // returns the first found position of the passed string
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// Shorthand for variable initialization
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nameFour := "yoshi"
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fmt.Println(nameFour)
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fmt.Println(strings.Split(greeting, " ")) // splits first passed string into an array at each of the second passed variables instances
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// Numeric data types doc https://go.dev/ref/spec#Numeric_types
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// sort package
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fmt.Println("-------------------------INTS-------------------------")
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otherAges := []int{45, 20, 35, 30, 75, 60, 50, 25}
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// ints
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var ageOne int = 20
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var ageTwo = 30
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ageThree := 40
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sort.Ints(otherAges) // sorts given values AND stores it in the same variable
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fmt.Println(otherAges)
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fmt.Println(ageOne, ageTwo, ageThree)
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index := sort.SearchInts(otherAges, 30) // gets the index of the passed value from the array first passed
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secondIndex := sort.SearchInts(otherAges, 90) // if the value passed is not found in the array, it will return what position it WOULD be in
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thirdIndex := sort.SearchInts(otherAges, 55)
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fmt.Println(index)
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fmt.Println(secondIndex)
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fmt.Println(thirdIndex)
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// bits & memory
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otherNames := []string{"mario", "luigi", "yoshi", "peach", "bowser"}
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// signed (positive and negative)
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var numOne int8 = 25 // -128 to 127
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var numTwo int16 = 35 // -32768 to 32767 (-32,768 to 32,767)
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var numThree int32 = 45 // -2147483648 to 2147483647 (-2,147,483,648 to 2,147,483,647)
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var numThreeAndAHalf rune = 45 // rune is the same as int32
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var numFour int64 = 55 // -9223372036854775808 to 9223372036854775807 (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807)
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sort.Strings(otherNames)
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fmt.Println(otherNames)
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fmt.Println(numOne, numTwo, numThree, numThreeAndAHalf, numFour)
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// unsigned (all positive)
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var posNumOne uint8 = 65 // 0 to 255
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var posNumTwo uint16 = 75 // 0 to 65535 (65,535)
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var posNumThree uint32 = 85 // 0 to 4294967295 (4,294,967,295)
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var posNumFour uint64 = 95 // 0 to 18446744073709551615 (18,446,744,073,709,551,615)
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fmt.Println(posNumOne, posNumTwo, posNumThree, posNumFour)
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fmt.Println("-------------------------FLOATS-------------------------")
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// decimal values default to float64
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var floatOne float32 = 25.98
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var floatTwo float64 = 9843216984654.68432168454651968
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floatThree := 6854324.6854654
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fmt.Println(floatOne, floatTwo, floatThree)
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fmt.Println(sort.SearchStrings(otherNames, "bowser")) // gives the position of the passed string in the array if found
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fmt.Println(sort.SearchStrings(otherNames, "waluigi")) // otherwise will return where it WOULD be
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}
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