Collect.js first() Function

The first() function gives the first value of the collection.

It returns the first value or the first method returns the first element in the collection that passes a given condition.  

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

Example 1: Here in this example, we take a collection and then using the first() function to get first value.

// 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.

// 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