Convert `string`, `bool`

In Go we use the strconv package to convert types like bool and strings. We can use ParseBool to get a bool from a string.

Format info

With FormatBool we can get a string from a bool. The two methods (ParseBool and FormatBool) are often used together in the same programs.

Input and output

Suppose we have the string "true," and want the boolean true. And meanwhile, the string "false" must be parsed as false.

"true"  -> true
"false" -> false

An example

To begin, we introduce a string slice of many versions of "true" and "false" strings. These should evaluate to true or false when we invoke ParseBool upon them.

Result We see that the strconv.ParseBool performs are we expect it to—true-meaning strings are converted to true.

Detail For FormatBool, we go from a bool (true or false) to a string like "true" or "false." This helps whenever we need a string.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    tests := []string{"1", "t", "T",
        "TRUE", "true", "True",
        "0", "f", "F",
        "FALSE", "false", "False"}

    // Loop over strings in string slice.
    for _, item := range(tests) {
        // Convert string to bool with ParseBool.
        result, _ := strconv.ParseBool(item)
        // Convert bool to string with FormatBool.
        fmt.Println(item + "->" + strconv.FormatBool(result))
    }
}1->true
t->true
T->true
TRUE->true
true->true
True->true
0->false
f->false
F->false
FALSE->false
false->false
False->false

Some notes

Some languages do not provide support for variants of strings that mean true or false. But in Go we have support for many strings like "t" and "1," not just "true."

A summary