What does the number 100 represent when creating a new Array in JavaScript?

In JavaScript, when you create a new array with a specific number, such as 100, that number indicates the initial size of the array and allocates memory for that many elements. This means that when you create an array with 100 as the parameter, JavaScript allocates enough memory to store 100 elements. However, it's important to note that these elements are initially set to undefined until you explicitly assign values to them.

The number does not establish a maximum limit on the number of elements that the array can hold; JavaScript arrays are dynamic and can grow as needed. The number also doesn't indicate a default value for the elements nor does it specify the array's dimensionality. In JavaScript, arrays are inherently one-dimensional structures, although they can contain nested arrays for multi-dimensionality.

By understanding this concept, you can manipulate arrays effectively, knowing that they can be initialized with a certain size but are flexible in how they can be modified as your program runs.