RemoveAtIndex crash from swift array

Question

I have an array of letters, and want to match the characters against the letters and then do something to that letter (in this case turn it yellow) and then remove that matched

Answer 1

For this purpose (removing elements of an array), you may want to use an indexing generator. Let me give an example:

var array = [1, 2, 3, 4]
var ig = array.generate()
var index = 0
var element = ig.next()
while element != nil {
    if element == 2 {
        array.removeAtIndex(index)
    } else {
        index = index + 1
    }
    element = ig.next()
}