Data Types:

Go has three basic data types:

  • bool: represents a boolean value and is either true or false
  • Numeric: represents integer types, floating point values, and complex types
  • string: represents a string value

Below is a example go code for different data types which also covers how the variables are declared and used in Go.

Go 
package main

import "fmt"

func main() {
    // Method 1: var with type
    var age int
    age = 30

    // Method 2: var with initialization (type inferred)
    var name = "Mithran"

    // Method 3: short declaration (inside functions only)
    score := 95.5

    // Multiple variables
    var x, y int = 10, 20
    a, b := "hello", true

    // Different data types
    var isActive bool = false
    var price float64 = 19.99
    var code byte = 'A'  // alias for uint8

    fmt.Println(name, age, score, x, y, a, b, isActive, price, code)
}

The above code provides the output as below

Bash 
Mithran 30 95.5 10 20 hello true false 19.99 65

Variables:

Variables is a container to store a data value. Go uses call by value

There are two ways to declare/create variables as below

  1. With the var keyword: Use the var keyword, followed by variable name and type:
    1. var variable_name datatype = value
    2. var variable _name = value
    3. the above methods are recommend to be used.
  2. With the := sign: Use the := sign, followed by the variable value:
    1. variable_name := value
    2. to be used only for short declaration and that too inside functions only