`take while` for filters

Take elements of the input while a predicate is true.

Signature

> take while {flags} (predicate)

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

Take while the element is negative.

> [-1 -2 9 1] | take while {|x| $x < 0 }
╭───┬────╮
│ 0 │ -1 │
│ 1 │ -2 │
╰───┴────╯

Take while the element is negative using stored condition.

> let cond = {|x| $x < 0 }; [-1 -2 9 1] | take while $cond
╭───┬────╮
│ 0 │ -1 │
│ 1 │ -2 │
╰───┴────╯

Take while the field value is negative.

> [{a: -1} {a: -2} {a: 9} {a: 1}] | take while {|x| $x.a < 0 }
╭───┬────╮
│ # │ a  │
├───┼────┤
│ 0 │ -1 │
│ 1 │ -2 │
╰───┴────╯