Using NSPredicate to filter array in iOS

NSArray *heroes = @[@”tracer”, @”bastion”, @”reaper”, @”junkrat”, @”roadhog”]; NSPredicate *template = [NSPredicate predicateWithFormat:@”self BEGINSWITH $letter”];NSDictionary *beginsWithRVariables = @{ @"letter": @"r"};
NSPredicate *beginsWithR = [template predicateWithSubstitutionVariables: beginsWithRVariables];NSArray *beginsWithRHeroes = [heroes filteredArrayUsingPredicate: beginsWithR];
// ["reaper", "roadhog"]NSDictionary *beginsWithTVariables = @{ @"letter": @"t"};
NSPredicate *beginsWithT = [template predicateWithSubstitutionVarables: beginsWithTVariables];NSArray *beginsWithTHeroes = [heroes filteredArrayUsingPredicate: beginsWithT];
// ["tracer"]

Swift

let heroes = ["tracer", "bastion", "reaper", "junkrat", "roadhog"]
let template = NSPredicate(format: "self BEGINSWITH $letter")let beginsWithRVariables = ["letter": "r"]
let beginsWithR = template.predicateWithSubstitutionVariables(beginsWithRVariables)let beginsWithRHeroes = heroes.filter { beginsWithR.evaluateWithObject($0) }
// ["reaper", "roadhog"]let beginsWithTVariables = ["letter": "t"]
let beginsWithT = template.predicateWithSubstitutionVariables(beginsWithTVariables)let beginsWithTHeroes = heroes.filter { beginsWithT.evaluateWithObject($0) }
// ["tracer"]