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?
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>
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!
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.
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.
users[key] = users[key] === 'true' || users[key] === 'True';
'RU'becomefalse?