An Array of Repeated Elements in JavaScript

Creating an array with the same element repeated multiple times is essential in various programming scenarios. In Python, this can be achieved with list multiplication as seen in [2] * 5. However, this functionality is not directly available in JavaScript's arrays.

Custom Function Approach

To address this need, one approach is to create a custom function, such as the repeatelem function provided in the question. This function accepts an element and a number of repetitions and initializes an empty array. It then iteratively adds the element to the array using the concat method.

ES6 Array.fill() Method

Fortunately, ES6 introduces the Array.fill() method, which provides a more concise solution for this problem. The fill() method fills an array with a provided value, starting at the specified index and extending up to the end of the array. By setting the index to zero and the value to the desired element, we can easily create an array with the element repeated as many times as needed.

Example:

console.log(
  Array(5).fill(2)
);
// Output: [2, 2, 2, 2, 2]

The Array.fill() method simplifies the process of creating arrays with repeated elements, making it a more efficient and readable solution in JavaScript.