The whereInstanceOf() function is used to filter input with a given class type. In JavaScript, the array is first converted to a collection and then the function is applied to the collection.
Syntax:
data.whereInstanceOf('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: Return the collection with a key value that was mentioned.
Below examples illustrate the whereInstanceOf() function in collect.js
Example 1: Here in this example, we take a collection and then using the whereInstanceOf() method we have returned filtered collection using the key.
Javascript
// It is used to import collect.js library const collect = require('collect.js'); const Input = collect([ new Books('Pride and prejudice'), new Books('The Great Gatsby '), new Movies('It'), ]); const output = Input.whereInstanceOf(Books); console.log(output.all()); |
Output:
[
new Books('Pride and prejudice'),
new Books('The Great Gatsby'),
]
Example 2: Same thing we have done here as the above example.
Javascript
// It is used to import collect.js library const collect = require('collect.js'); const Input = collect([ new Year('1980'), new Year('2020'), new Name('Mohan'), ]); const output = Input.whereInstanceOf(Name); console.log(output.all()); |
Output:
[
new Name('Mohan'),
]
References: https://collect.js.org/api/whereinstanceof.html
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