Lulu Arrays – Flattening

Introduction

If you have imported the lulu.Array class as

local Array = require 'lulu.Array'

Then, you can use flatten an Array using the method:

Array:flatten(depth))
Returns a new Array which is a flattened version of self.
The default value for the depth parameter is 1.

Example:

local a = Array{{1,2}, {3,4}, {5,6}}
putln("a:           %t", a)
putln("a:flatten(): %t", a:flatten())

Outputs:

a:           [ [1, 2], [3, 4], [5, 6] ]
a:flatten(): [ 1, 2, 3, 4, 5, 6 ]

Another Example:

local a = Array{{{1,2}}, {{{3,4}}}, {5,6}}
putln("a:flatten(): %t", a:flatten())

Outputs [ [ 1, 2 ], [ [ 3, 4 ] ], 5, 6 ].

For the same array, a:flatten(2) will give [ 1, 2, [3, 4], 5, 6 ], and a:flatten(3) will give [ 1, 2, 3, 4, 5, 6 ] which is also the output from a:flatten(n) for \(n > 3\).

Introduction

See Also