## J - <strike>7</strike> 3

**Max of number and inverse (3)**
 
    >.-

When assigned to a function: take the maximum between the negative and the number, using a hook so: (f g) y = y f g y

    f=:>.-
    f _4 5 _1 0
       4 5 1 0

**root of the square (5 or 4)**

    ]&.*: _4 5 _1 0
        4 5 1 0
    NB. or if an expression is good enough:
    %:*: _4 5 _1 0
        4 5 1 0

**Negate if number smaller than its negative (7)**

    -^:(<-) 

Takes the inverse (the inverse is bigger than the number itself) times.

Would loosely translate to:

    if -num > num then
        num= -num
    end