如何将仅包含数组值的 object 转换为对象数组，每个对象都具有转置属性值？

Question

What is the most efficient way to convert the data below in node.js? Any help would be much appreciated. Thanks!

I have some data that looks like this ->

const inputdata = {
  data1: [5.0, 10.0, 50.0, 100.0, 500.0],
  data2: [5.0, 10.0, 50.0, 100.0, 500.0],
  data3: [5.0, 10.0, 50.0, 100.0, 500.0],
};

and I need to convert it into this ->

[
  { data1: 5.0, data2: 5.0, data3: 5.0 },
  { data1: 10.0, data2: 10.0, data3: 10.0 },
  { data1: 50.0, data2: 50.0, data3: 50.0 },
  { data1: 100.0, data2: 100.0, data3: 100.0 },
  { data1: 500.0, data2: 500.0, data3: 500.0 },
]

Code attempt ->

const inputdata = {
  data1: [5.0, 10.0, 50.0, 100.0, 500.0],
  data2: [5.0, 10.0, 50.0, 100.0, 500.0],
  data3: [5.0, 10.0, 50.0, 100.0, 500.0],
};
const outputdata = [];

Object.keys(inputdata).forEach(key => {
  let value = inputdata[key];

  if (key === "data1"){
    for (let i = 0; i < value.length; i++) {
      outputdata.push({ data1: 0, data2: 0, data3: 0 });
    }
  }
}
Object.keys(inputdata).forEach(key => {
  let value = inputdata[key];

  if (key === "data1") {
    for (let i = 0; i < value.length; i++) {
      outputdata[i].data1 = value[i];
    }
  }
  if (key === "data2") {
    for (let i = 0; i < value.length; i++) {
      outputdata[i].data2 = value[i];
    }
  }
  if (key === "data3") {
    for (let i = 0; i < value.length; i++) {
      outputdata[i].data3 = value[i];
    }
  }
}
console.log(inputdata);
console.log(outputdata);

Answer 1

You could transpose the data and build new objects from data.

 const data = { data1: [5, 10, 50, 100, 500], data2: [5, 10, 50, 100, 500], data3: [5, 10, 50, 100, 500] }, result = Object.entries(data).reduce((r, [k, a]) => a.map((v, i) => ({...r[i], [k]: v })), []); console.log(result);

 .as-console-wrapper { max-height: 100%;important: top; 0; }

Answer 2

Used techniques of the below provided step by step example code...

• Object.assign

• Object.values

• Array.prototype.map

• Array.prototype.reduce

 // reducer function which transposes // a table into a matrix and vice versa. function transpose(result, row) { return row.reduce((matrix, value, idx) => { (matrix[idx]??= []).push(value); return matrix; }, result); } const inputdata = { data1: [5.0, 10.0, 50.0, 100.0, 500.0], data2: [5.0, 10.0, 50.0, 100.0, 500.0], data3: [5.0, 10.0, 50.0, 100.0, 500.0] }; console.log( Object // convert `inputdata` into a table //... an array of row like arrays. .values(inputdata) ); console.log( Object // - convert `inputdata` into a table //... an array of row like arrays. .values(inputdata) // - then transpose the table into a matrix. .reduce(transpose, []) ); console.log( Object // - convert `inputdata` into a table //... an array of row like arrays. .values(inputdata) // - then transpose the table into a matrix. .reduce(transpose, []) // - then convert/map matrix // into an array of objects. .map(vector => vector.reduce((object, value, idx) => Object.assign(object, { [`data${ idx + 1 }`]: value, }), {} ) ) );

 .as-console-wrapper { min-height: 100%;important: top; 0; }