What means “_” symbol in Kotlin?

问题

I tried to find information what it means but I didn't. Trying to understand what it does in this code:

checkBox.setOnCheckedChangeListener { _, isChecked ->
            if (isChecked) {
                // The toggle is enabled
            } else {
                // The toggle is disabled
            }
        }

回答1:

The _ Used for

• substitutes an unused parameter in a lambda expression
• substitutes an unused parameter in a destructuring declaration

For more information check this Keywords and Operators

来源：https://stackoverflow.com/questions/59006347/what-means-symbol-in-kotlin