2675. Array of Objects to Matrix

Problem Link

Description

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null

Solution

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TypeScript

function jsonToMatrix(arr: any[]): (string | number | boolean | null)[][] {
  const flattenObject = (obj: any, prefix = ""): Record<string, any> => {
    let result: Record<string, any> = {};
 
    for (let key in obj) {
      let value = obj[key];
 
      if (typeof value === "object" && value !== null) {
        let flattened = flattenObject(value, prefix + key + ".");
        result = { ...result, ...flattened };
      } else {
        result[prefix + key] = value;
      }
    }
 
    return result;
  };
 
  let flattenedArr = arr.map(obj => flattenObject(obj));
 
  let columnSet = new Set<string>();
  flattenedArr.forEach(obj => {
    Object.keys(obj).forEach(key => columnSet.add(key));
  });
 
  let columns = Array.from(columnSet).sort();
  let matrix: (string | number | boolean | null)[][] = [columns];
 
  flattenedArr.forEach(obj => {
    let row = columns.map(key => (obj[key] !== undefined ? obj[key] : ""));
    matrix.push(row);
  });
 
  return matrix;
}