tryParseBool function

bool? tryParseBool(String? value)

Tries to parse a bool from a String.

Returns true if the input is "true", "yes", or "1". Returns false if the input is "false", "no", or "0". In both cases, case and surrounding whitespace are ignored.

Returns null if the input is not recognized.

Implementation

bool? tryParseBool(String? value) {
  if (value == null) {
    return null;
  }

  const trueStrings = {'true', 'yes', '1'};
  const falseStrings = {'false', 'no', '0'};
  value = value.trim().toLowerCase();
  if (trueStrings.contains(value)) {
    return true;
  } else if (falseStrings.contains(value)) {
    return false;
  }
  return null;
}