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))

@JosephtheDreamer yes I tried: _.zipObject(sets.Seen || {}, _.fill([], true, 0, sets.Seen.length)) — Calin Leafshade
– Calin Leafshade, Commented Sep 9, 2015 at 14:13

Jaromanda X · Accepted Answer · 2015-09-09 14:10:27Z

13

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

answered Sep 9, 2015 at 14:10

Jaromanda X

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1 Comment

azium Over a year ago

This is the first time I've seen the comma operator on return. Interesting stackoverflow.com/questions/10284536/…

Selrond · Accepted Answer · 2022-02-04 12:36:26Z

1

Using lodash:

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

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

answered Feb 4, 2022 at 12:36

Selrond

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Comments

johnny 5 · Accepted Answer · 2015-09-09 14:08:57Z

0

a simple way would be like this:

function toObject(arr) {
   var rv = {};
   for (var i = 0; i < arr.length; ++i)
   rv[i] = true;
   return rv;
}

answered Sep 9, 2015 at 14:08

johnny 5

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Tro · Accepted Answer · 2015-09-09 14:14:28Z

0

var array = ["one", "two", "three"];
var myObject = new Object();

for (i = 0; i < array.length; i++) {
    myObject[array[i]] = true;
}

console.log(myObject);

answered Sep 9, 2015 at 14:14

Tro

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1 Comment

Edwin Reynoso Over a year ago

Don't use new Object(), use an object literal instead {}

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