GO Tutorial

Data Types in Go

In Go, data types define the kind of values a variable can hold. Understanding data types helps you write efficient and error-free code.

Common Data Types in Go

Declaring Variables with Data Types

You can explicitly declare a variable’s type using the var keyword, like this:

var age int = 25
var price float64 = 9.99
var name string = "GoLang"
var isActive bool = true
  

Type Inference with := Operator

Go can automatically detect the type based on the assigned value, so you can use the shorthand := for declaration and assignment:

age := 25           // int
price := 9.99       // float64
name := "GoLang"    // string
isActive := true    // bool
  

Interactive Example: Identify Data Types

Below are some variable declarations. Guess the data type before checking the answer!

• var score = 100 → Show Answer
• var temperature = 36.6 → Show Answer
• var greeting = "Hello" → Show Answer
• var isAvailable = false → Show Answer

Tips for Using Data Types in Go

• Be explicit: When in doubt, specify the data type to avoid errors.
• Use type inference: For cleaner code, use := when possible.
• Know zero values: Go initializes variables with zero values (e.g., 0 for int, "" for string).
• Type conversion: Use explicit conversion when assigning values between different data types.