# All files / NCalc/extensions isNullOrEmpty.ts

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     import {ArgumentException} from '../Domain';
    import {FunctionArgs} from '../FunctionArgs';

    export const isNullOrEmpty = (args: FunctionArgs) => {
      Iif (args.Parameters.length !== 1) {
        throw new ArgumentException(`{ExtensionFunction.IsNullOrEmpty}() requires one parameter.`);
      }
      const out = args.Parameters[0].Evaluate();
      args.Result = out == null || out === '';
    };