I'm trying to get all objects with matching id's from my students array and get other property values from them...
For instance my array looks like this:
const students = [
{id: 1, name: 'Cal', location: 'McHale' },
{id: 2, name: 'Courtney', location: 'Sydney Hall' },
{id: 1, name: 'Cal', location: 'Syndey hall' }
]
So my expected output would grab all instances of id: 1.
{id: 1, name: 'Cal', location: 'McHale' },
{id: 1, name: 'Cal', location: 'Syndey hall' }
I'll eventually want to remove duplicate names and display in a list like so... (But that's down the line. For now I just want to grab matching objects).
Id: 1 Name: Cal Location: McHale
Syndey Hall
I've tried:
const result = _.find(students, {student_id: studentId});
But that doesn't seem to work, it just returns one of the objects with that id..
{id: 1, name: 'Cal', location: 'McHale' },
How can I make this work?
3 Answers
I would look into the filter function. It's build into JavaScript.
Here's an example of how it works. All you need to do is find a way to make a function that will tell if it has the proper id.
function isBigEnough(value) {
return value >= 10;
}
var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
// filtered is [12, 130, 44]
If you see the documentation for _.find it states
Iterates over elements of collection, returning the first element predicate returns truthy for.
You should use the _.filter method for what you want
Iterates over elements of collection, returning an array of all elements predicate returns truthy for.
Something like
const result = _.filter(students, {student_id: studentId});
const result = students.filter(e => e.id === 1);
