func:eachWhile

eachWhile(val, fn)

Iterate the items of a collection until the given function returns non-null. Once non-null is returned, then break the iteration and return the resulting object. Return null if the function returns null for every item.

• Grid: iterate the rows as (row, index)
• List: iterate the items as (val, index)
• Dict: iterate the name/value pairs (val, name)
• Str: iterate the characters as numbers (char, index)
• Range: iterate the integer range (integer)
• Stream: iterate items as (val); see Streams