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var data = [["Date", "Key1", "Key2", "Key3", "Key4"], ["2018-11-01", "254", "-", "-", "-"], ["2018-11-02", "648", "-", "-", "-"], ["2018-11-03", "270", "170", "-", "147"], ["2018-11-04", "300", "406", "136", "208"]],

    result = data.slice(1).map(a => Object.assign(...a.map((v, i) => ({ [data[0][i]]: v }))));

    

console.log(result);

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var matrix = [

  [ "Date", "Key1", "Key2", "Key3", "Key4" ],

  [ "2018-11-01", "254", "-", "-", "-" ],

  [ "2018-11-02", "648", "-", "-", "-" ],

  [ "2018-11-03", "270", "170", "-", "147" ],

  [ "2018-11-04", "300", "406", "136", "208" ]

];



console.log(JSON.stringify(matrixToJsonObjectArray(matrix, true), null, 2));



function matrixToJsonObjectArray(matrix, includesHeader) {

 var fields = includesHeader ? matrix[0] : range(matrix[0].length);

 return (includesHeader ? matrix.slice(1) : matrix).map(row => {

  var obj = {};

  fields.forEach((field, i) => obj[field] = row[i]);

  return obj;

 });

}



function range(start, end) {

  var arr = ;

  if (end === undefined) end = start, start = 0;

  for (var i = start; i < end; i++) arr.push(i); 

  return arr;

}

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const data = [["Date", "Key1", "Key2", "Key3", "Key4"], ["2018-11-01", "254", "-", "-", "-"], ["2018-11-02", "648", "-", "-", "-"], ["2018-11-03", "270", "170", "-", "147"], ["2018-11-04", "300", "406", "136", "208"]];



// zip two arrays to an object

const zipObject = (keys) => (values) =>

  keys.reduce((r, key, i) => ({ ...r, [key]: values[i] }), {});

  

// convert a two dimensional array to object

const arrToObj = ([keys, ...values]) => values.map(zipObject(keys));



const result = arrToObj(data);

    

console.log(result);

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