HH\ImmVector::slice
Returns a subset of the current ImmVector
starting from a given key up
to, but not including, the element at the provided length from the
starting key.
Description
public function slice(
int $start,
int $len,
): ImmVector<Tv>
Returns a subset of the current ImmVector
starting from a given key up
to, but not including, the element at the provided length from the
starting key.
$start
is 0based. $len
is 1based. So slice(0, 2)
would return the
elements at key 0 and 1.
The returned ImmVector
will always be a subset (but not necessarily a
proper subset) of the current ImmVector
. If $start
is greater than or
equal to the length of the current Vector
, the returned Vector
will
contain no elements. If $start
+ $len
is greater than or equal to the
length of the current Vector
, the returned Vector
will contain the
elements from $start
to the end of the current Vector
.
If either $start
or $len
is negative, an exception is thrown.
Parameters

int $start
 The starting key of the currentImmVector
at which to begin the returnedImmVector
. 
int $len
 The length of the returnedImmVector
.
Return Values

ImmVector<Tv>
 AnImmVector
that is a subset of the currentImmVector
starting at$start
up to but not including the element$start + $len
.
Examples
See Vector::slice
for usage examples.