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39 lines
1.0 KiB
Plaintext
39 lines
1.0 KiB
Plaintext
// There are no classes, only structs. Structs can have methods.
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// A struct is a type. It's also a collection of fields
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// Declaration
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type Vertex struct {
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X, Y int
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}
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// Creating
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var v = Vertex{1, 2}
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var v = Vertex{X: 1, Y: 2} // Creates a struct by defining values with keys
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var v = []Vertex{{1,2},{5,2},{5,5}} // Initialize a slice of structs
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// Accessing members
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v.X = 4
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// You can declare methods on structs. The struct you want to declare the
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// method on (the receiving type) comes between the func keyword and
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// the method name. The struct is copied on each method call(!)
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func (v Vertex) Abs() float64 {
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return math.Sqrt(v.X*v.X + v.Y*v.Y)
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}
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// Call method
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v.Abs()
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// For mutating methods, you need to use a pointer (see below) to the Struct
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// as the type. With this, the struct value is not copied for the method call.
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func (v *Vertex) add(n float64) {
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v.X += n
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v.Y += n
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}
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// **Anonymous structs:**
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// Cheaper and safer than using `map[string]interface{}`.
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point := struct {
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X, Y int
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}{1, 2}
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