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const createList = (item, idx) => {
    let obj = {}; obj[`a${idx}`] = "data"; return obj;
};
const listReducer = (acc, cur) => (!acc ? {
    ...cur
}: {
    ...cur, ...acc
});
const obj = Array.from(new Array(20), createList).reduce(listReducer);
console.log(obj);

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