The whereIn() function is used to filter the collection by a given key or value contained within the given array. In JavaScript, the array is first converted to a collection and then the function is applied to the collection.
Syntax:
data.whereIn('key')
Parameters: This function accepts a single parameter as mentioned above and described below:
- Key: This parameter holds the key name that defines the value of that key.
Return value: Returns the collection with a key value that was mentioned.
Below examples illustrate the whereIn() function in collect.js
Example 1: Here in this example, we take a collection and then using the whereIn() method we have returned filtered collection using the key.
// It is used to import collect.js library
const collection = collect([
{ Book: 'Let US C', price: 2000 },
{ Book: 'Begin Python', price: 1000 },
{ Book: 'Learn the DEV', price: 1500 },
]);
const filtered = collection.whereIn('price', [1000, 1500]);
filtered.all();
Output:
[
{ Book: 'Begin Python', price: 1000 },
{ Book: 'Learn the DEV', price: 1500 }
]
Example 2:
// It is used to import collect.js library
const collect = require('collect.js');
const Input = collect([
new Year('1980'),
new Year('2020'),
new Year('2025'),
]);
const output = Input.whereIn('Year',[2000, 2025]);
console.log(output.all());