JS Array emptying and de-weight

1.splice

var ary = [1,2,3,4];ary.splice (0//  output ARRAY[0], empty array, which is emptied

2.length is assigned a value of 0

This is interesting, and other languages such as Java, whose array length is read-only, cannot be assigned a value. Such as

Int
ary.length = 0;

Java will error, compile pass. And JS can be, and the array is emptied,

var ary = [1,2,3,4//  output [], empty array, which is emptied

The current prototype array in the clear and MooTools libraries in the empty array is used this way to empty the array.

3. Assign value to []

var ary = [1,2,3,4= [];

JS Array emptying and de-weight