Build up an indexed list of strings. Useful for minimising the size of categorical data when transferring it over the wire.

Creates a new indexed list.

Adds one or more new elements to the end of the list.

Creates a serialized version of the input data, ready to be stringified into JSON, which can later be loaded with IndexList.load().

Note that while this is generally more compact, you can reduce the size further by storing the items as binary data using a Uint32Array or similar. Alternatively you can convert that data into base64 and expand before loading it again.

Loads a previously serialized IndexList, returning a new instance.

var list = IndexList(data)
var copy = IndexList.load(list.toJSON())

// copy.expand() ~= list.expand()

Creates an expanded copy of the stored values, representing the original input data.

var list = IndexList(['hello', 'world', 'again', 'hello', 'hello', 'world', 'again', 'again'])

// list.toJSON() ~= { items: [0, 1, 2, 0, 0, 1, 2, 2], index: ['hello', 'world', 'again'] }
// list.expand() ~= ['hello', 'world', 'again', 'hello', 'hello', 'world', 'again', 'again']

MIT. See LICENSE.md for details.