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ltrim

LTRIM

LTRIM key start stop

Available since 1.0.0.

Time complexity: O(N) where N is the number of elements to be removed by the operation.

Trim an existing list so that it will contain only the specified range of elements specified. Both start and stop are zero-based indexes, where 0 is the first element of the list (the head), 1 the next element and so on.

For example: LTRIM foobar 0 2 will modify the list stored at foobar so that only the first three elements of the list will remain.

start and end can also be negative numbers indicating offsets from the end of the list, where -1 is the last element of the list, -2 the penultimate element and so on.

Out of range indexes will not produce an error: if start is