ios - 'advance' keyword in swift? - 


let word = "sample string"  let firstletter = character(word.substringtoindex(advance(word.startindex,1)).uppercasestring)

i got above example tutorial. can know mean "advance" , difference between "substringtoindex" , "substringwithrange".

this advance syntax swift 1, it's different now.

swift 2

let firstletter = character(word.substringtoindex(word.startindex.advancedby(1)).uppercasestring)

the advancedby method moves current index along string.

with substringtoindex slice part of string, beginning @ start of string , ending @ index defined advancedby.

here advance 1 in string, means substringtoindex first character string.

swift 3

the syntax has changed again, use substring , index offset:

let firstletter = character(word.substring(to: word.index(word.startindex, offsetby: 1)).uppercased())

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