Kotlin: How can I pass a predicate to CharSequence.any() function?

Question

I'm trying to find whether a character belongs to a string.

var s = "abcdef"
var result = s.any('d')

But I can't understand that syntax. From docs:

fun CharSequence.any(predicate: (Char) -> Boolean): Boolean 

How can I pass a predicate to the function?

Answer 1

Full syntax:

s.any({ ch -> ch == 'd' })

We can make some simplifications.

First, since lambda parameter comes last, we can place it outside of the parentheses and omit them entirely, when there is no more parameters left.

Second, for lambda function literal with one parameter it is possible to omit the parameter declaration and reference that parameter by it name.

Thus the simplified equivalent would be:

s.any { it == 'd' }