arrays - How to find index of list item in Swift? -

i trying find item index searching list. know how that?

i see there list.startindex , list.endindex bu want python's list.index("text")

as swift in regards more functional object-oriented (and arrays structs, not objects), use function "find" operate on array, returns optional value, prepared handle nil value:

let arr:array = ["a","b","c"] find(arr, "c")!              // 2 find(arr, "d")               // nil 

update swift 2.0:

the old find function not supported more swift 2.0!

with swift 2.0, array gains ability find index of element using function defined in extension of collectiontype (which array implements):

let arr = ["a","b","c"]  let indexofa = arr.indexof("a") // 0 let indexofb = arr.indexof("b") // 1 let indexofd = arr.indexof("d") // nil 

additionally, finding first element in array fulfilling predicate supported extension of collectiontype:

let arr2 = [1,2,3,4,5,6,7,8,9,10] let indexoffirstgreaterthanfive = arr2.indexof({$0 > 5}) // 5 let indexoffirstgreaterthanonehundred = arr2.indexof({$0 > 100}) // nil 

note these 2 functions return optional values, find did before.

update swift 3.0:

note syntax of indexof has changed. items conforming equatable can use:

let indexofa = arr.index(of: "a") 

a detailed documentation of method can found @ https://developer.apple.com/reference/swift/array/1689674-index

for array items don't conform equatable you'll need use index(where:):

let index = cells.index(where: { (item) -> bool in   item.foo == 42 // test if item you're looking })