The first() function gives the first value of the collection. Simply means it returns the first value or the first method returns the first element in the collection that passes a given condition. In JavaScript, the array is first converted to a collection and then the function is applied to the collection.
Syntax:
data.first(e)
Parameters: This function accepts a single parameter as mentioned above and described below:
- e : This parameter holds a condition that has to pass by the collection
Return value: Processed value
Below examples illustrate the first() function in collect.js
Example 1: Here in this example, we take a collection and then using the first() function to get first value.
Javascript
// It is used to import collect.js library const collect = require('collect.js'); const nums = [0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9]; const data = collect(nums); let value = data.first(e => e =4); console.log(value); |
Output :
0
Example 2: In this example, we will get the first negative value.
Javascript
// It is used to import collect.js library const collect = require('collect.js'); const num = [0 , 1 , 2 , 3 , -4 , 5 , -6 , 7 , 8 , 9]; const data = collect(num); let value = data.first(e => e < 0); console.log(value); |
Output:
-4
Reference: https://collect.js.org/api/first.html
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