hasProperty static method

bool hasProperty(dynamic value, dynamic key)

Implementation

static bool hasProperty(dynamic value, dynamic key) {
  key = _normalizeProperty(key);
  if (value is Map) {
    if (value.containsKey(key) ||
        getOwnPropertyDescriptor(value, key) != null) {
      return true;
    }
    final prototype = getPrototype(value);
    return prototype != null && hasProperty(prototype, key);
  }
  if (value is List) {
    key = _normalizeIndexProperty(key);
    if (key is int) {
      return key >= 0 && key < value.length && !isArrayHole(value[key]);
    }
    return getters(value).containsKey(key) || methods(value).containsKey(key);
  }
  if (value is String) {
    key = _normalizeIndexProperty(key);
    if (key is int) return key >= 0 && key < value.length;
    return getters(value).containsKey(key) || methods(value).containsKey(key);
  }
  if (value is Invokable) {
    return value.hasGettableProperty(key) || value.hasMethod(key);
  }
  return false;
}