    @find(t:tab, f:function)
    @find(m:map, f:function)
    @find(s:string, f:function)

returns the index of the first element of `t`, `m` or `s` that satisfies the predicate `f`.

The predicate is a binary function taking the index or the key as the first argument and the associated value for the second argument.

The undef value (for maps) or the integer `-1` (for tab and string) is returned if there is no pair satisfying the predicate.

See also @count, @member and @occurs.

Example:

           @fun_def p(i, v) { return (i > 1) && (v % 2 == 0) }
           @find([1, 2, 3, 4], @p)  ; returns 4

@find returns the first index greather than one such that the corresponding element is a multiple of two.

           @fun_def p(i, v) { return (i > 1) && (v >= "b") }
           @find("abcdefg", @p)  ; returns 2

the index `2` is returned because the `"c"` is the first character greather or equal to `"b"` such that its position is strictly greather than one (character numbering starts at zero).

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