CompaniesData.fromJson constructor
Implementation
CompaniesData.fromJson(Map<String, dynamic> json)
: this.totalHoldings = Convert.toDouble(json['total_holdings'], 0),
this.totalValueUsd = Convert.toDouble(json['total_value_usd'], 0),
this.marketCapDominance =
Convert.toDouble(json['market_cap_dominance'], 0),
this.companies = _parseCompanies(json['companies']);