How to use reduce() function In Javascript

Here, we will use the reduce function with the array to determine the length.

Javascript

// Defining the array
let arr = [12,4.7,9,10];

// Using the reduce function to count the elements
let length=arr.reduce((size)=>size+1,0);

// Printing the Length
console.log(`length of given array -> ${length}`);

Output

length of given array -> 4

Explanation:

The above code defines an array arr. It then utilizes the reduce() function to count the number of elements in the array by incrementing a counter (size) for each element. Finally, it prints the length of the array.