Converting array of arrays into object?

Question

Trying to convert an array of arrays (where the inner arrays only have two values stored) into an object.

This is what I've got so far:

 function fromListToObject(array) { var obj = {}; for (i in array) { obj[array[i[0]]] = array[i[1]]; }; return obj }; A1=[['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]]; console.log(fromListToObject(A1));

But it's giving me an object where the keys are the array pairs, and the values are "undefined."

Halp?

Answer 1

With ES6, you could use

• Object.assign for a new object,
• spread syntax ... for taking an array as parameters,
• Array#map for returning single objects in an array,
• destructuring assignment for getting parts of an array/object and
• computed property names for a named value pair for an object.

 var array = [['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]], object = Object.assign(...array.map(([k, v]) => ({ [k]: v }))); console.log(object); 

Answer 2

Change your code to:

function fromListToObject(array) {
  var obj = {};
  for (i in array) {
      obj[array[i][0]] = array[i][1];
  };
  return obj
};


A1=[['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]];
console.log(fromListToObject(A1));

You wrote wrong syntax when get array value.

Answer 3

You can use Array.prototype.reduce() as follows:

 const array = [['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]]; const object = array.reduce((result, [key, value]) => { result[key] = value; return result; }, {}); console.log(object); 

Answer 4

Try this:

function fromListToObject(array) {
  return Object.assign.apply({}, array.map(function(subarray) {
      var temp = {}
      temp[subarray[0]] = subarray[1]
      return temp
    })
  )
};


A1=[['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]];
console.log(fromListToObject(A1));

It flattens all the arrays into one big object with these key-value pairs:

{ make: 'Ford', model: 'Mustang', year: 1964 }

Answer 5

The Object.fromEntries method does this simply

 var array = [['make', 'Ford'], ['model', 'Mustang'], ['year', 1964]]; var obj = Object.fromEntries(array); console.log(obj);

More about Object.fromEntries() - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries