ios - Array does not perform a command in swift -

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array not perform command in swift

i show simple example

    var array = ["x", "y", "z"]     var index = array.indexof("y")

i error '[string]' not have member named 'indexof'

i saw this question doesn't me.

i imported

import uikit import foundation import avfoundation import coreaudio import mediaplayer import avkit

indexof available in swift 2.0

Dil