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var data = [1, 2,3,4,5,6,7];
function Metadatum (x) {
  this.value = x;
}
let metadata = data.map((x) => { return new Metadatum(x); });
let metadata1 = data.map(x => new Metadatum(x));
console.log(metadata[0].value);
console.log(metadata1[0].value);
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addi90pro
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