Kotlin String - toBoolean() Function

The Kotlin string toBoolean() function is used to convert or parse a string into a Boolean value and returns true if the string is true and false for any other value, including null (when the string is empty, or any other string that is not "true").

Syntax

Following is the syntax of the Kotlin string toBoolean() function −

fun String.toBooleanStrict(): Boolean

Parameters

This function does not accepts any parameters.

Return value

This function returns a Boolean value: "true' if the string is "true" (case insensitive); otherwise, false.

Example 1

Following is the basic example of the toBoolean() function: If string is "true" −

fun main() {
   // if string is true
   val str = "true"
   val result = str.toBoolean()
   println(result)
}

Output

If the string is true this function return true −

true

Example 2

Let's see another example of the toBoolean() function. Here we are using a string with mixed case −

fun main() {
   // if string is True
   val str = "TrUe"
   val result = str.toBoolean()
   println(result)
}

Output

If the string (TrUe) is case-sensitive this function return true −

true

Example 3

Now, let's see another example of the toBoolean() if the string is "false" −

fun main() {
   // if string is false
   val str = "false"
   val result = str.toBoolean()
   println(result)
}

Output

If the string is "false" this function return false −

false