JavaScript How to make first array the header and remaining arrays rows of objects array make first element

I am new to coding and trying to get this problem right. I tried calling the index of the arrays but it prints out columns. Out dev environment is REPL.it, the virtual machine uses node v10.16.0 and help would be greatly appreciate

Input

tableData = [
    ["first_name", "last_name", "city", "state"],
    ["Elisabeth", "Gardenar", "Toledo", "OH"],
    ["Jamaal", "Du", "Sylvania", "OH"],
    ["Kathlyn", "Lavoie", "Maumee", "OH"]
]

Desired Output

output = [
    { first_name : "Elisabeth", last_name : "Gardenar", city: "Toledo", state : "OH" },
    { first_name : "Jamaal", last_name : "Du", city: "Sylvania", state : "OH" },
    { first_name : "Kathlyn", last_name : "Lavoie", city: "Maumee", state : "OH" }
]

What I have tried so far is this:

function convertTable(){
    var p=console.log;
    const [header,...rows] = tableData;
    var tableObj = new Object;
    var intermediateVal = [];
    var finalArr = [];
    for(var vals=0;vals<rows.length;vals++){
        var row = rows[vals]
        for (var key=0,val=0;key<header.length;key++,val++){
            tableObj[header[key]]=row[val]
        }
    p(tableObj)
  }
} 
convertTable(tableData)

Answer:1

Here is a potential solution that uses array reduce.

const tableData = [
  ["first_name", "last_name", "city", "state"],
  ["Elisabeth", "Gardenar", "Toledo", "OH"],
  ["Jamaal", "Du", "Sylvania", "OH"],
  ["Kathlyn", "Lavoie", "Maumee", "OH"]
];

const keys = tableData.shift();

const formatted = tableData.reduce((agg, arr) => {
  agg.push(arr.reduce((obj, item, index) => {
    obj[keys[index]] = item;
    return obj;
  }, {}));
  return agg;
}, [])

console.log(formatted);

Answer:2

You're pretty close, but you need to create a new object for each row of the result, and then push that object onto the finalArr array.

There's also no need for both key and val variables, since they're always the same.

tableData = [
  ["first_name", "last_name", "city", "state"],
  ["Elisabeth", "Gardenar", "Toledo", "OH"],
  ["Jamaal", "Du", "Sylvania", "OH"],
  ["Kathlyn", "Lavoie", "Maumee", "OH"]
];

function convertTable() {
  var p = console.log;
  const [header, ...rows] = tableData;
  var finalArr = [];
  for (var vals = 0; vals < rows.length; vals++) {
    var row = rows[vals]
    var tableObj = {};
    for (var key = 0; key < header.length; key++) {
      tableObj[header[key]] = row[key]
    }
    finalArr.push(tableObj);
  }
  p(finalArr)

}
convertTable(tableData)

Answer:3

You can also leverage the reduce method which is included in arrays.

tableData = [
    ["Elisabeth", "Gardenar", "Toledo", "OH"],
    ["Jamaal", "Du", "Sylvania", "OH"],
    ["Kathlyn", "Lavoie", "Maumee", "OH"]
];

const obj = tableData.reduce((acc, cv, index) => {
        acc.push({
            first_name: cv[0],
            last_name: cv[1],
            city: cv[2],
            state: cv[3]
        });
        return acc
},[]);

console.log(obj); 
// [ { first_name: 'Elisabeth',
//    last_name: 'Gardenar',
//    city: 'Toledo',
//    state: 'OH' },
//  { first_name: 'Jamaal',
//    last_name: 'Du',
//    city: 'Sylvania',
//    state: 'OH' },
//  { first_name: 'Kathlyn',
//   last_name: 'Lavoie',
//    city: 'Maumee',
//   state: 'OH' } ]

Answer:4

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