delete
will delete the object property, but will not reindex the array or update its length. This makes it appears as if it is undefined:
> myArray = ['a', 'b', 'c', 'd'] ["a", "b", "c", "d"] > delete myArray[0] true > myArray[0] undefined
Note that it is not in fact set to the value undefined
, rather the property is removed from the array, making it appear undefined. The Chrome dev tools make this distinction clear by printing empty
when logging the array.
> myArray[0] undefined > myArray
[empty, “b”, “c”, “d”]
myArray.splice(start, deleteCount)
actually removes the element, reindexes the array, and changes its length.
> myArray = ['a', 'b', 'c', 'd'] ["a", "b", "c", "d"] > myArray.splice(0, 2) ["a", "b"] > myArray ["c", "d"]
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