将数组数组转换为对象？

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