Go Mastery: A Comprehensive Guide - Part 2: Control Flow (If, Switch, Loops)

Go Mastery: A Comprehensive Guide - Part 2: Control Flow (If, Switch, Loops)

Introduction

Control flow is how we dictate the execution path of our Go programs. Go keeps it simple, focusing on readability and maintainability.

If/Else Statements

In Go, there are no parentheses around conditions, but curly braces are mandatory.

if x > 10 {
    fmt.Println("x is greater than 10")
} else {
    fmt.Println("x is 10 or less")
}

Switch Statement

The switch statement in Go is powerful and flexible. It breaks automatically, so you don’t need break at the end of each case.

switch os := runtime.GOOS; os {
case "darwin":
    fmt.Println("OS X.")
case "linux":
    fmt.Println("Linux.")
default:
    fmt.Printf("%s.\n", os)
}

For Loop

In Go, there is only one looping construct: for.

Standard Loop

for i := 0; i < 5; i++ {
    fmt.Println(i)
}

While Loop (equivalent)

for n < 10 {
    n++
}

Infinite Loop

for {
    // Infinite loop
}

Conclusion

We have mastered the core control flow constructs of Go. These simple tools allow you to build complex logic with clarity. In the next part, we will look into data structures like arrays, slices, and maps.

Suggested Reading

• Go Documentation: Control Flow