替换对象值lodash

Question

Lets say I have an object

var users = [
  { Mike:    'true' },
  { Tony:    'True' },
  { Ismael:  'RU' }
];

I have this problem where I want to normalise my object, basically replace "true" or "True" with a boolean true anything else should be false .

By the way I may have the syntax for users wrong, chrome is telling me users.constructor == Object and not Array .

How can I achieve this using lodash?

Answer 1

In Lodash, you can use _.mapValues :

 const users = [ { Mike: 'true' }, { Tony: 'True' }, { Ismael: 'RU' }, ]; const normalisedUsers = users.map(user => _.mapValues(user, val => val.toLowerCase() === 'true') ); console.log(normalisedUsers); 

 <script src="https://cdn.jsdelivr.net/lodash/4.16.3/lodash.min.js"></script> 

Answer 2

You don't have to use lodash. You can use native Array.prototype.map() function:

 const users = [ { Mike: 'true' }, { Tony: 'True' }, { Ismael: 'RU' }, ]; const normalisedUsers = users.map(user => // Get keys of the object Object.keys(user) // Map them to [key, value] pairs .map(key => [key, user[key].toLowerCase() === 'true']) // Turn the [key, value] pairs back to an object .reduce((obj, [key, value]) => (obj[key] = value, obj), {}) ); console.log(normalisedUsers); 

Functional programming FTW!

Answer 3

You don't need lodash to achieve this, just use a for loop. Here is an example

var users = [
  { Mike:    'true' },
  { Tony:    'True' },
  { Ismael:  'RU' }
];

for (key in users) {
   if (users[key] == 'true' || users[key] == 'True') {
      users[key] = true
   } else {
     users[key] = false
   }
}

What this is doing is, if your value is 'true' or 'True' then assign a boolean val of true to your object & else assign false.

Edit

You could also do it the shorthand way, as suggested by 4castle :

users[key] = users[key] == 'true' || users[key] == 'True';

Simply replace the if/else block with this one line.