VList: Difference between revisions
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=={{header|J}}==
A vlist preallocates storage in increasing powers of 2. The "head" of the vlist is in the last (largest) storage block. Here we define a class with methods <code>unshift</code> (which adds to the "head" of the vlist), <code>shift</code> (which removes from the "head" of the vlist), <code>size</code> (which tells us how many elements the vlist currently contains), and <code>get</code> (which retrieves the nth element from the vlist):
<lang J>coclass 'vlist'
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