Golang Parse Float64

When it comes to parsing float64 in Golang, there are different ways to handle the conversion from a string to a float64. In this article, we will explore some of the common approaches and best practices for parsing float64 in Golang.

Using strconv.ParseFloat()

One of the easiest ways to parse float64 in Golang is to use the strconv.ParseFloat() function. This function takes in a string as the first argument, which represents the float value you want to parse, and the second argument represents the bit size of the float you want to convert to. The function returns a float64 and an error.

Here is an example of how to use strconv.ParseFloat() function to parse a float value:

package main

import (
	"fmt"
	"strconv"
)

func main() {
	floatString := "123.45"
	floatValue, err := strconv.ParseFloat(floatString, 64)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(floatValue)
}

In the above example, we pass in the "123.45" string representation of the float value, and a bit size of 64 to strconv.ParseFloat(). The function returns the float64 value which is stored in the floatValue variable.

Using fmt.Sscanf()

Another way to parse float64 in Golang is to use the fmt.Sscanf() function. This function works similar to the fmt.Sprintf() function, but it reads data from a string instead of writing data to a string.

Here is an example of how to use fmt.Sscanf() function to parse a float value:

package main

import (
	"fmt"
)

func main() {
	floatString := "123.45"
	var floatValue float64
	_, err := fmt.Sscanf(floatString, "%f", &floatValue)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(floatValue)
}

In the above example, we pass in the "123.45" string representation of the float value, and %f as the format specifier to fmt.Sscanf(). The function returns the number of items scanned, which is ignored here and the float value is stored in the floatValue variable.

Conclusion

In this article, we explored some of the common approaches and best practices for parsing float64 in Golang. We saw how to use the strconv.ParseFloat() function and the fmt.Sscanf() function to parse float values from a string.