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javascriptarraysobject

How to convert an array into an object?

What is the best way to convert:

['a','b','c']

to:

{
  0: 'a',
  1: 'b',
  2: 'c'
}
Solution

  • ECMAScript 6 introduces the easily polyfillable Object.assign:

    The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

    Object.assign({}, ['a','b','c']); // {0:"a", 1:"b", 2:"c"}

    The own length property of the array is not copied because it isn't enumerable.

    Also, you can use ES8 spread syntax on objects to achieve the same result:

    { ...['a', 'b', 'c'] }

    For custom keys you can use reduce:

    ['a', 'b', 'c'].reduce((a, v) => ({ ...a, [v]: v}), {}) 
// { a: "a", b: "b", c: "c" }