LoDash: Get an array of values from an array of object properties
JavascriptLodashJavascript Problem Overview
I'm sure it's somewhere inside the LoDash docs, but I can't seem to find the right combination.
var users = [{
id: 12,
name: 'Adam'
},{
id: 14,
name: 'Bob'
},{
id: 16,
name: 'Charlie'
},{
id: 18,
name: 'David'
}
]
// how do I get [12, 14, 16, 18]
var userIds = _.map(users, _.pick('id'));
Javascript Solutions
Solution 1 - Javascript
Since version v4.x you should use _.map:
_.map(users, 'id'); // [12, 14, 16, 18]
this way it is corresponds to native Array.prototype.map method where you would write (ES2015 syntax):
users.map(user => user.id); // [12, 14, 16, 18]
Before v4.x you could use _.pluck the same way:
_.pluck(users, 'id'); // [12, 14, 16, 18]
Solution 2 - Javascript
With pure JS:
var userIds = users.map( function(obj) { return obj.id; } );
Solution 3 - Javascript
In the new lodash release v4.0.0 _.pluck has removed in favor of _.map
Then you can use this:
_.map(users, 'id'); // [12, 14, 16, 18]
You can see in Github Changelog
Solution 4 - Javascript
And if you need to extract several properties from each object, then
let newArr = _.map(arr, o => _.pick(o, ['name', 'surname', 'rate']));
Solution 5 - Javascript
Simple and even faster way to get it via ES6
let newArray = users.flatMap(i => i.ID) // -> [ 12, 13, 14, 15 ]
Solution 6 - Javascript
const users = [{
id: 12,
name: 'Adam'
},{
id: 14,
name: 'Bob'
},{
id: 16,
name: 'Charlie'
},{
id: 18,
name: 'David'
}
]
const userIds = _.values(users);
console.log(userIds); //[12, 14, 16, 18]
Solution 7 - Javascript
If you are using native javascript then you can use this code -
let ids = users.map(function(obj, index) {
return obj.id;
})
console.log(ids); //[12, 14, 16, 18]
Solution 8 - Javascript
This will give you what you want in a pop-up.
for(var i = 0; i < users.Count; i++){
alert(users[i].id);
}