Creating null-filled objects

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Using Object.fromEntries + map
const columnNames = ['a', 'b', c]
Object.fromEntries(
    columnNames.map((columnName) => [columnName, null])
);
ready
Using Array.reduce
const columnNames = ['a', 'b', c]
columnNames.reduce((carry, current) => {
	carry[current] = null
	return carry;
  }, {});
ready

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