Array clear
Example:
array.add("one")
array.add("two")
array.add("three")
// array now contains thre items. array[0] is "one",
// array[1] is "two", and array [3] is "three".
array.clear()
// array now has no elements in it.
array.add("two")
array.add("three")
// array now contains thre items. array[0] is "one",
// array[1] is "two", and array [3] is "three".
array.clear()
// array now has no elements in it.
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