import libd.datastructures.string, libd.datastructures.array; Array!char arr; arr.put("0123456789"); assert("0123456789".indexOf('0') == 0); assert(String("0123456789").indexOf('9') == 9); assert(arr.indexOf('4') == 4); assert("The quick brown fox jumped over the lazy dog.".indexOf('d') == 25); assert("The quick brown fox jumped over the lazy dog.".indexOf('z') == 38);