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`each while` for filters

Run a block on each row of the input list until a null is found, then create a new list with the results.

> each while {flags} (closure)

input	output
list<any>	list<any>
table	list<any>

Produces a list of each element before the 3, doubled

> [12321] |each while {|e| if$e<3 { $e*2 } }
╭───┬───╮
│0│2│
│1│4│
╰───┴───╯

Output elements until reaching 'stop'

> [12stop34] |each while {|e| if$e!='stop' { $"Output: ($e)" } }
╭───┬───────────╮
│0│Output:1│
│1│Output:2│
╰───┴───────────╯

Iterate over each element, printing the matching value and its index

> [123] |enumerate|each while {|e| if$e.item<2 { $"value ($e.item) at ($e.index)!"} }
╭───┬───────────────╮
│0│value1at0!│
╰───┴───────────────╯

Tips: Command each while was not included in the official binaries by default, you have to build it with --features=extra flag