import UIKit
let weekDays:[String] = [
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"
]
let firstIndex = weekDays.firstIndex(of: "Tuesday")
print(firstIndex ?? -1)
//Result = 2
let lastIndex = weekDays.lastIndex(of: "Tuesday")
print(lastIndex ?? -1)
//Result = 9
let notFound = weekDays.firstIndex(of: "tuesday")
print(notFound ?? -1)
//Result = -1
print(weekDays.firstIndex(where: { $0.hasSuffix("day") })!)
//Result = 0
print(weekDays.firstIndex(where: { $0.hasPrefix("Wed") })!)
//Result = 3
All one can think and do in a short time is to think what one already knows and to do as one has always done!
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