How to convert an array of strings to keyed object in javascript/lodash

Question

Given the array:

var arr = [ "one", "two", "three" ];

Whats the cleanest way to convert it to:

{ "one": true, "two": true, "three": true }

I tried the following but I imagine there is a better way.

 _.zipObject(arr || {}, _.fill([], true, 0, arr.length))

Answer 1

var obj = arr.reduce(function(o, v) { return o[v] = true, o; }, {});

Answer 2

Using lodash:

const arr = ['one', 'two', 'three'];

_.mapValues(_.keyBy(arr), () => true);