strings.Builder in Go lang

strings.Builder type in Go’s standard library provides several methods to help build and manipulate strings efficiently. The following are the primary methods available:

package main

import (
	"fmt"
	"strings"
)

func main() {
	// Create a new strings.Builder
	var builder strings.Builder

	// Method 1: Write (using []byte)
	builder.Write([]byte("Hello, "))
	fmt.Println("After Write: ", builder.String()) // Output: Hello, 

	// Method 2: WriteByte
	builder.WriteByte('w')
	fmt.Println("After WriteByte: ", builder.String()) // Output: Hello, w

	// Method 3: WriteRune
	builder.WriteRune('o')
	fmt.Println("After WriteRune: ", builder.String()) // Output: Hello, wo

	// Method 4: WriteString
	builder.WriteString("rld!")
	fmt.Println("After WriteString: ", builder.String()) // Output: Hello, world!

	// Method 5: String
	result := builder.String()
	fmt.Println("String Method: ", result) // Output: Hello, world!

	// Method 6: Len
	length := builder.Len()
	fmt.Printf("Len Method: Length = %d\n", length) // Output: Len Method: Length = 13

	// Method 7: Cap
	capacity := builder.Cap()
	fmt.Printf("Cap Method: Capacity = %d\n", capacity)

	// Method 8: Reset
	builder.Reset()
	fmt.Println("After Reset: ", builder.String()) // Output: (empty string)

	// Method 9: Grow
	builder.Grow(50) // Preallocate space for 50 bytes
	builder.WriteString("This is a new string.")
	fmt.Println("After Grow and Write: ", builder.String()) // Output: This is a new string.
}