Hi, Array.prototype.filter could be used to convert sparse to dense array, e.g.
[1,,,,,2,,,,,3].filter(Boolean.bind(null, true)); //[1, 2, 3] Would be pretty straightforward if built-in filter could be called without callback function and returns a dense array. I guess the engines will optimize that and library authors could gracefully iterate over index properties of arrays without checking for existance.
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