Is there a way to create a dictionary in Javascript with all keys pointing to the same value?

Question

Is there a way to create a dictionary in Javascript with all keys pointing to the same value?

I have a scenario where I need to convert an array into an object like this:

let arr = ['ABC', 'DEF']

The desired transformation is:

let obj = {"ABC": 0, "DEF": 0}

Can someone guide me on how to achieve this using ES6 syntax?

let arr = ['ABC', 'DEF']
arr.reduce(x => ({[x] : 0 }))

I tried the above code snippet, but it only gives me {"ABC": 0}

In essence, I want to set all values in the array to a default value of 0. The array could be of any length.

Any help would be appreciated! Thank you!

javascript arrays ecmascript-6 arrow-functions

Answer 1

Answer №1

To simplify the process, just use a basic loop like this:

const items = ['123', '456'];
const data = {};
for (const item of items) data[item] = 0;

If you're looking for a more advanced solution, consider using Object.fromEntries:

Object.fromEntries(items.map(item => [item, 0]))

Answer 2

To simplify the process, just use a basic loop like this:

const items = ['123', '456'];
const data = {};
for (const item of items) data[item] = 0;

If you're looking for a more advanced solution, consider using Object.fromEntries:

Object.fromEntries(items.map(item => [item, 0]))

Answer 3

Answer №2

Creating individual objects like a map is not the most efficient way. It's better to return the object each time.

const arr = ['ABC', 'DEF']
const result = arr.reduce((o, k)  => ({[k] : 0, ...o }), {});
console.log(result)



const result2 = arr.reduce((o, k)  => (o[k] = 0, o), {});
console.log(result2)

Answer 4

Creating individual objects like a map is not the most efficient way. It's better to return the object each time.

const arr = ['ABC', 'DEF']
const result = arr.reduce((o, k)  => ({[k] : 0, ...o }), {});
console.log(result)



const result2 = arr.reduce((o, k)  => (o[k] = 0, o), {});
console.log(result2)

Answer 5

Answer №3

const newObj = arr.reduce((acc, val, idx) => {
  acc[val] = 0;
  return acc;
}, {})

I trust this solution will be beneficial to you. Feel free to reach out if you encounter any challenges.

Answer 6

const newObj = arr.reduce((acc, val, idx) => {
  acc[val] = 0;
  return acc;
}, {})

I trust this solution will be beneficial to you. Feel free to reach out if you encounter any challenges.

Answer 7

Answer №4

To implement this functionality, simply utilize the Array.reduce method with an empty object declared as the initial value in the code snippet below:

var result = ["123","456"].reduce((x,y) => (x[y]=0,x),{});
console.log(result);

Answer 8

To implement this functionality, simply utilize the Array.reduce method with an empty object declared as the initial value in the code snippet below:

var result = ["123","456"].reduce((x,y) => (x[y]=0,x),{});
console.log(result);

Is there a way to create a dictionary in Javascript with all keys pointing to the same value?

Answer №1

Answer №2

Answer №3

Answer №4

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