What is the mean of this in JavaScript

Question

arr=[]

Answer 1

Yes, it deletes all elements.

Answer 2

As Donna said, it's used for creating an array. If the brackets have nothing between them, you've either declared an empty array or you've emptied the contents.

Declaring empty array:

var arr = [];

Now fill the array:

arr = ["blue", "pink"];

arr[0] now = "blue"
arr[1] now = "pink"

Now empty the array:

arr = [];

Answer 3

Duncan Not actually deleted though. Elements are removed from the array.

For elements passed by reference (a.k.a objects), emptying the array only remove a reference to the object.

Answer 4

Duncan if we empty the array again does this mean that the previous element in the array will automatically be deleted