?Explain thelengthproperty of an array with examples.

What will be an ideal response?

?A JavaScript array automatically expands in length as more items are added. To determine the array's current size, apply the followinglengthproperty??array.length
wherearrayis the name of the array. The value returned by thelengthproperty is equal to one more than the highest index number in the array (because array indices start at 0 rather than 1), so, if the highest number in the index is 11, then the value returned would be 12.
JavaScript allows for the creation of sparse arrays, in which some array values are undefined. As a result, thelengthvalue is not always the same as the number of array values. For example, the following commands create a sparse array in which only the first and last items have defined values:
var x = new Array();x[0] = "Lewis";x[99] = "80517";?The value of thelengthproperty for this array is 100 even though it only contains two values. Sparse arrays occur frequently in database applications involving customer records where items such as mobile phone numbers or postal codes have not been entered for every person.
It must be noted that the value of thelengthproperty cannot be reduced without removing items from the end of the array. For example, the following command would reduce the monthName array to the first three months-January, February, and March:?monthName.length = 3;
Increasing the value of the length property adds more items to an array, but the items have null values until they are defined.