indexOf method
Returns the index of the first element
in the list.
Searches the list from index start
to the end of the list.
The first time an object o
is encountered so that o == element
,
the index of o
is returned.
If start
is not provided, this method searches from the start of the list.
final IList<String> notes = ['do', 're', 'mi', 're'].lock;
notes.indexOf('re'); // 1
notes.indexOf('re', 2); // 3
Returns -1
if element
is not found.
notes.indexOf('fa'); // -1
Implementation
int indexOf(T element, [int start = 0]) {
_count();
var _length = length;
if (start < 0 || start >= _length)
throw ArgumentError.value(start, "index", "Index out of range");
for (int i = start; i <= _length - 1; i++) if (this[i] == element) return i;
return -1;
}