ValueAt method
Returns the Pointer<Char> for the keyed slot key, optionally writing
text into it.
Allocates the slot on first use. If text is null the existing string
is returned; asserts that the slot has been initialised at least once.
Implementation
Pointer<Char> ValueAt(String key, [String? text]) {
final slot = _StringSlotsKeyed.putIfAbsent(
key, () => _StringSlots.length
);
_ensureStringSlotExists(slot);
if (text != null) {
return _writeStringToSlot(slot, text);
}
assert(
_StringSlots[slot] != nullptr,
'[TEMP] String.ValueAt("$key") used before initialization'
);
return _StringSlots[slot];
}