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Iterative Method

Recursive Method:

Using the in-built methods:

In this method, we will use a simple for loop in JavaScript to iterate through the elements of the array and multiply them with each other to get the multiply result at the end. This approach is more efficient than the previous recursive approach as it takes the linear time complexity and constant extra space to solve the probelm.

Example: The below example will illustrate how you can multiply elements of an array using a loop in JavaScript:

Javascript 
const arr1 = [8, 9, 3, 7, 5, 13];
const arr2 = [12, 9, 5, 18, 23];

const iterativeMultiply = (arr) => {
    let result = 1;
    for (let i = 0; i < arr.length; i++) {
        result *= arr[i];
    }
    return result;
};

console.log(iterativeMultiply(arr1))

Output
98280
223560

Time Complexity: O(n), n is the size of the passing array.

Space Complexity: O(1)

Multiply the elements of an array in JavaScript

We will be given an initial array and we have to multiply all the elements of the array with each other to find a final product.

Examples:

Input: arr = [1, 2, 3, 4, 5];
Output: 120
Explanation: 1 * 2 * 3 * 4 * 5 = 120
Input: arr = [11, 12, 13, 14, 15]
Output: 360360
Explanation: 11 * 12 * 13 * 14 * 15 = 360360

There are three ways available in which we can solve this problem in JavaScript:

Table of Content

  • Recursive Method:
  • Iterative Method:
  • Using the in-built methods:
  • Using forEach method
  • Using the Math Object:

Similar Reads

Recursive Method:

In this approach, we will recursively visit each element of the array and multiply it with the product of all the previous elements to get a new product value till the current element....

Iterative Method:

In this method, we will use a simple for loop in JavaScript to iterate through the elements of the array and multiply them with each other to get the multiply result at the end. This approach is more efficient than the previous recursive approach as it takes the linear time complexity and constant extra space to solve the probelm....

Using the in-built methods:

There are some in-built array methods available in JavaScript which we can use to iterate through the array elements and make changes in their values by passing a callback function inside them. We will use the map() and the reduce() in-built methods in this approach to multiply the elements of an array....

Using forEach method

In this approach we use forEach method. With forEach we look at each number in the array, one after the other. for each number we multiply it with a running total....

Using the Math Object:

JavaScript’s Math object provides several methods for mathematical operations. We can use the Math object to multiply all the elements of an array using the Math.pow() method, which calculates the power of a number....

Tags:
#javascript-array #JavaScript #Web Technologies

Recursive Method:

Using the in-built methods: