Don't Get Clever

Part of the Ruby Rogues live panel episode at Lone Star Ruby Conference 2013.

Transcript

1. Don't Get Clever
   Avdi Grimm
   

   View Slide

2. Pop quiz
   r
   e
   q
   u
   i
   r
   e '
   p
   s
   t
   o
   r
   e
   '
   s
   t
   o
   r
   e = P
   S
   t
   o
   r
   e
   .
   n
   e
   w
   (
   '
   d
   a
   t
   a
   .
   p
   s
   t
   o
   r
   e
   '
   )
   s
   t
   o
   r
   e
   .
   t
   r
   a
   n
   s
   a
   c
   t
   i
   o
   n
   (
   t
   r
   u
   e
   ) d
   o
   # .
   .
   .
   e
   n
   d
   

   View Slide

3. Pop quiz 2
   A
   r
   r
   a
   y
   .
   i
   n
   s
   t
   a
   n
   c
   e
   _
   m
   e
   t
   h
   o
   d
   s
   (
   f
   a
   l
   s
   e
   )
   

   View Slide

4. Symbols are truthy
   r
   e
   q
   u
   i
   r
   e '
   p
   s
   t
   o
   r
   e
   '
   s
   t
   o
   r
   e = P
   S
   t
   o
   r
   e
   .
   n
   e
   w
   (
   '
   d
   a
   t
   a
   .
   p
   s
   t
   o
   r
   e
   '
   )
   s
   t
   o
   r
   e
   .
   t
   r
   a
   n
   s
   a
   c
   t
   i
   o
   n
   (
   :
   r
   e
   a
   d
   _
   o
   n
   l
   y
   ) d
   o
   # .
   .
   .
   e
   n
   d
   

   View Slide

5. Clever!
   

   View Slide

6. What's :
   r
   e
   a
   d
   _
   o
   n
   l
   y
   ??
   s
   t
   o
   r
   e
   .
   t
   r
   a
   n
   s
   a
   c
   t
   i
   o
   n
   (
   :
   r
   e
   a
   d
   _
   o
   n
   l
   y
   ) d
   o
   # .
   .
   .
   e
   n
   d
   

   View Slide

7. Dead end
   s
   t
   o
   r
   e
   .
   t
   r
   a
   n
   s
   a
   c
   t
   i
   o
   n
   (
   :
   c
   h
   u
   n
   k
   y
   _
   b
   a
   c
   o
   n
   ) d
   o
   # .
   .
   .
   e
   n
   d
   

   View Slide

8. Negation
   A
   r
   r
   a
   y
   .
   i
   n
   s
   t
   a
   n
   c
   e
   _
   m
   e
   t
   h
   o
   d
   s
   (
   !
   :
   i
   n
   c
   l
   u
   d
   e
   _
   s
   u
   p
   e
   r
   )
   

   View Slide

9. Don't get clever
   

   View Slide

10. Intention-revealing argument
    r
    e
    a
    d
    _
    o
    n
    l
    y = t
    r
    u
    e
    s
    t
    o
    r
    e
    .
    t
    r
    a
    n
    s
    a
    c
    t
    i
    o
    n
    (
    r
    e
    a
    d
    _
    o
    n
    l
    y
    ) d
    o
    # .
    .
    .
    e
    n
    d
    

    View Slide

11. Intention-revealing argument
    i
    n
    c
    l
    u
    d
    e
    _
    s
    u
    p
    e
    r = f
    a
    l
    s
    e
    A
    r
    r
    a
    y
    .
    i
    n
    s
    t
    a
    n
    c
    e
    _
    m
    e
    t
    h
    o
    d
    s
    (
    i
    n
    c
    l
    u
    d
    e
    _
    s
    u
    p
    e
    r
    )
    

    View Slide

12. Inline version
    A
    r
    r
    a
    y
    .
    i
    n
    s
    t
    a
    n
    c
    e
    _
    m
    e
    t
    h
    o
    d
    s
    (
    i
    n
    c
    l
    u
    d
    e
    _
    s
    u
    p
    e
    r = f
    a
    l
    s
    e
    )
    

    View Slide

13. Don't get clever
    

    View Slide