Go की Best Practices

// Every Go file belongs to a package; main builds an executable
package main

// Import the packages this program uses
import (
	"fmt"
	"strconv"
)

// Define the function parseAge
func parseAge(input string) (int, error) {
	// Short declaration: create age, err and infer the type
	age, err := strconv.Atoi(input)
	// Handle the error if one occurred
	if err != nil {
		return 0, fmt.Errorf("invalid age %q: %w", input, err)
	}
	// Send age, nil back to the caller
	return age, nil
}

// main is where the program starts running
func main() {
	// Short declaration: create age, err and infer the type
	age, err := parseAge("thirty")
	if err != nil {
		fmt.Println("error:", err)
		return
	}
	fmt.Println("age:", age)
}

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// Every Go file belongs to a package; main builds an executable
package main

// Import the fmt package
import "fmt"

// Define the function classify
func classify(age int) string {
	// Check whether age < 0
	if age < 0 {
		// Send "invalid" back to the caller
		return "invalid"
	}
	// Check whether age < 13
	if age < 13 {
		// Send "child" back to the caller
		return "child"
	}
	if age < 20 {
		return "teen"
	}
	return "adult"
}

// main is where the program starts running
func main() {
	fmt.Println(classify(15))
	fmt.Println(classify(-1))
}

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// Every Go file belongs to a package; main builds an executable
package main

// Import the packages this program uses
import (
	"fmt"
	"strings"
)

// Define the function wordCount
func wordCount(r *strings.Reader) int {
	// Short declaration: create buf and infer the type
	buf := make([]byte, r.Len())
	r.Read(buf)
	return len(strings.Fields(string(buf)))
}

// main is where the program starts running
func main() {
	// Short declaration: create r and infer the type
	r := strings.NewReader("Go favors small interfaces")
	// Print the values followed by a newline
	fmt.Println(wordCount(r))
}

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gofmt -l .
go vet ./...

⚠️ Run this in your own terminal or Node.js environment.