Fernando Vásquez is an electronics engineer and software developer currently based in the world. He occasionally blogs about Python and Android programming.
Go Types
Published on 15 Sep 2023
Signed Integers
- int, according to the OS: 32 or 64 bits
- int8
- int16
- int32
- int64
Unsigned Integers
- uint, according to the OS: 32 or 64 bits
- uint8
- uint16
- uint32
- uint64
Floating Point
- float32
- float64
Summary
| Type | Example Declaration | Example Initialization |
|---|---|---|
| Integer | var x int |
x := 42 |
| Floating Point | var y float64 |
y := 3.14 |
| Boolean | var flag bool |
flag := true |
| String | var s string |
s := "Hello, Go!" |
| Character | Not a separate type | ch := 'A' |
| Array | var arr [3]int |
arr := [3]int{1, 2, 3} |
| Slice | Not a type; dynamic sizing | slice := []int{1, 2, 3} |
| Map | var m map[string]int |
m := make(map[string]int) |
| Struct | type Person struct { Name string; Age int } |
person := Person{Name: "Alice", Age: 30} |
| Pointer | var ptr *int |
x := 42; ptr := &x |
| Function | func add(a, b int) int { ... |
N/A (functions are declared, not initialized) |
| Interface | Not a type; abstract type | N/A (interfaces are implemented, not initialized) |
Remember that Go is statically typed, so you declare the type of a variable when you first create it using the var keyword or the := shorthand for variable declaration and initialization.
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