NodeJS Array of objects into one Object

Question

I have the following structure

[
  { type: 'total_users', total: '393647' },
  { type: 'total_male_users', total: '259555' },
  { type: 'total_female_users', total: '134092' },
  { type: 'active_users', total: '1232' },
  { type: 'active_male_users', total: '144' }
]

I'm trying to convert this into an object (something like the following)... I would like to reference the object like "blah.total_users"

{
  'total_users': '393647',
  'total_male_users',
  'total_female_users',
  'active_users',
  'active_male_users'
}

Being trying the following but I'm a way off - returns an array and errors with the return structure below.

statistics = statisticsResult.rows.map((data) => [data.type]: data.total)

thankyou

map will return another array.. if you want to change array to object, you can do it using reduce function (instead of map function) — wakakak
– wakakak, Commented Mar 24, 2021 at 21:57

wakakak · Accepted Answer · 2021-03-24 22:01:28Z

2

You can use arr.reduce (instead of arr.map, because map will return an array) to do this, for ex:

const arr = [
  { type: 'total_users', total: '393647' },
  { type: 'total_male_users', total: '259555' },
  { type: 'total_female_users', total: '134092' },
  { type: 'active_users', total: '1232' },
  { type: 'active_male_users', total: '144' }
];

const x = arr.reduce((acc, cur) => {
  acc[cur.type] = cur.total;
  return acc;
}, {});

console.log(x);

answered Mar 24, 2021 at 22:01

wakakak

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Nicholas Carey · Accepted Answer · 2021-03-24 22:15:08Z

1

The easiest way is with lodash, using assign() or defaults().

Which you use is dependent on the behavior you want.

const _ = require('lodash');
[
  { type: 'total_users', total: '393647' },
  { type: 'total_male_users', total: '259555' },
  { type: 'total_female_users', total: '134092' },
  { type: 'active_users', total: '1232' },
  { type: 'active_male_users', total: '144' }
];

const obj = _.assign( {}, ...arr );

answered Mar 24, 2021 at 22:15

Nicholas Carey

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