Function makeIterator

tfjs-data/src/dataset_test.ts:222–232

()

     async () => {
       try {
         const makeIterator = () => {
           let count = 0;
           return {
             next: () => {
               if (count > 2) {
                 throw new Error('propagate me!');
               }
               return {value: count++, done: false};
             }
           };
         };
         const a = tfd.generator(makeIterator);
         const b = tfd.array([3, 4, 5, 6]);
         // Using toArray() rather than toArrayForTest().  The prefetch in