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Commit aee4333

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Go Methods
1 parent 61b94de commit aee4333

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8 files changed

+226
-0
lines changed
  • 13-methods
    • 01-method-example
    • 02-methods-are-functions
    • 03-same-method-names-on-different-types
    • 04-methods-with-pointer-receivers
    • 05-functions-with-pointer-arguments
    • 06-method-with-pointer-receiver-vs-function-with-pointer-argument
    • 07-method-with-value-receiver-vs-function-with-value-argument
    • 08-methods-on-non-struct-types

8 files changed

+226
-0
lines changed

‎13-methods/01-method-example/main.go

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package main
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import (
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"fmt"
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)
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// Struct type - `Point`
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type Point struct {
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X, Y float64
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}
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// Method with receiver `Point`
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func (p Point) IsAbove(y float64) bool {
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return p.Y > y
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}
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func main() {
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p := Point{2.0, 4.0}
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fmt.Println("Point : ", p)
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fmt.Println("Is Point p located above the line y = 1.0 ? : ", p.IsAbove(1))
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}
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package main
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import (
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"fmt"
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)
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// Struct type - `Point`
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type Point struct {
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X, Y float64
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}
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func IsAboveFunc(p Point, y float64) bool {
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return p.Y > y
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}
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/*
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Compare the above function with the corresponding method -
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func (p Point) IsAbove(y float64) bool {
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return p.Y > y
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}
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*/
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func main() {
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p := Point{2.5, -3.0}
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fmt.Println("Point : ", p)
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fmt.Println("Is Point p located above the line y = 1.0 ? : ", IsAboveFunc(p, 1))
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}
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package main
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import (
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"fmt"
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"math"
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)
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type ArithmeticProgression struct {
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A, D float64
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}
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// Method with receiver `ArithmeticProgression`
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func (ap ArithmeticProgression) NthTerm(n int) float64 {
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return ap.A + float64(n-1)*ap.D
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}
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type GeometricProgression struct {
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A, R float64
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}
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// Method with receiver `GeometricProgression`
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func (gp GeometricProgression) NthTerm(n int) float64 {
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return gp.A * math.Pow(gp.R, float64(n-1))
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}
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func main() {
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ap := ArithmeticProgression{1, 2} // AP: 1 3 5 7 9 ...
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gp := GeometricProgression{1, 2} // GP: 1 2 4 8 16 ...
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fmt.Println("5th Term of the Arithmetic series = ", ap.NthTerm(5))
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fmt.Println("5th Term of the Geometric series = ", gp.NthTerm(5))
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}
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package main
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import (
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"fmt"
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)
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type Point struct {
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X, Y float64
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}
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/*
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Translates the current Point, at location (X,Y), by dx along the x axis and dy along the y axis
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so that it now represents the point (X+dx,Y+dy).
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*/
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func (p *Point) Translate(dx, dy float64) {
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p.X = p.X + dx
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p.Y = p.Y + dy
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}
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func main() {
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p := Point{3, 4}
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fmt.Println("Point p = ", p)
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p.Translate(7, 9)
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fmt.Println("After Translate, p = ", p)
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}
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package main
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import (
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"fmt"
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)
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type Point struct {
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X, Y float64
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}
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/*
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Translates the current Point, at location (X,Y), by dx along the x axis and dy along the y axis
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so that it now represents the point (X+dx,Y+dy).
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*/
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func TranslateFunc(p *Point, dx, dy float64) {
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p.X = p.X + dx
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p.Y = p.Y + dy
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}
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func main() {
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p := Point{3, 4}
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fmt.Println("Point p = ", p)
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TranslateFunc(&p, 7, 9)
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fmt.Println("After Translate, p = ", p)
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}
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package main
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import (
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"fmt"
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)
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type Point struct {
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X, Y float64
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}
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// Method with Pointer receiver
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func (p *Point) Translate(dx, dy float64) {
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p.X = p.X + dx
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p.Y = p.Y + dy
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}
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// Function with Pointer argument
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func TranslateFunc(p *Point, dx, dy float64) {
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p.X = p.X + dx
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p.Y = p.Y + dy
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}
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func main() {
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p := Point{3, 4}
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ptr := &p
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fmt.Println("Point p = ", p)
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// Calling a Method with Pointer receiver
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p.Translate(2, 6) // Valid
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ptr.Translate(5, 10) // Valid
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// Calling a Function with a Pointer argument
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TranslateFunc(ptr, 20, 30) // Valid
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// TranslateFunc(p, 20, 30) // Not Valid
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}
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package main
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import (
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"fmt"
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)
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// Struct type - `Point`
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type Point struct {
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X, Y float64
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}
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func (p Point) IsAbove(y float64) bool {
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return p.Y > y
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}
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func IsAboveFunc(p Point, y float64) bool {
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return p.Y > y
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}
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func main() {
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p := Point{0, 4}
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ptr := &p
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fmt.Println("Point p = ", p)
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// Calling a Method with Value receiver
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p.IsAbove(1) // Valid
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ptr.IsAbove(1) // Valid
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// Calling a Function with a Value argument
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IsAboveFunc(p, 1) // Valid
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// IsAboveFunc(ptr, 1) // Not Valid
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}
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package main
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import (
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"fmt"
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)
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type MyString string
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func (myStr MyString) reverse() string {
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s := string(myStr)
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runes := []rune(s)
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for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
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runes[i], runes[j] = runes[j], runes[i]
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}
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return string(runes)
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}
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func main() {
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myStr := MyString("OLLEH")
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fmt.Println(myStr.reverse())
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}

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