Program imperatively with PureScript using State and Lenses

I guess people really aren't joking when they say Haskell is the finest imperative language.

Quote by Gabriel Gonzalez at his famous blog post "Program imperatively using Haskell lenses"

:space_invader: :space_invader: :space_invader: Let's have with PureScript an another finest imperative language! :space_invader: :space_invader: :space_invader:

That's why you will find here all code of Program imperatively using Haskell lenses (originally written by @Gabriel439) ported to PureScript.

The fun part with lenses are supported by purescript-profunctor-lenses

Have fun :sunglasses:

How to ...?

Read the code

To understand all code start to read the original Haskell tutorial. Compare the original Haskell examples with the following PureScript files:

• Game.purs (state manipulation w/ lenses)
• Lenses.purs (lenses generated by purescript-derive-lenses)
• Data.purs (all types)
• Main.purs (output of all results to console)

Run

npm install
npm start

Output

##################
Getter / Setter
##################

# get score
0

# set score
(Game { boss: (GameUnit { health: 100, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 10000, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 15, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 8, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

# update score
(Game { boss: (GameUnit { health: 100, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 222, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 15, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 8, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

##################
Composition
##################

# strike
*shink*
(Game { boss: (GameUnit { health: 133, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 15, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 8, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

# strike'
*shink*
(Game { boss: (GameUnit { health: 133, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 15, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 8, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

##################
Traversal
##################

# fireBreath
*srawr*
(Game { boss: (GameUnit { health: 100, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 7, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 12, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 5, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

# fireBreath'
*srawr*
(Game { boss: (GameUnit { health: 100, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 7.0 }) }),(GameUnit { health: 12, position: (GamePoint { x: 1.0, y: 1.0 }) }),(GameUnit { health: 5, position: (GamePoint { x: 0.0, y: 2.1 }) })] })

##################
Zooming
##################

# partyLoc
((GamePoint { x: 3.5, y: 7.0 }) : (GamePoint { x: 1.0, y: 1.0 }) : (GamePoint { x: 0.0, y: 2.1 }) : Nil)

# retreat
Retreat!
(Game { boss: (GameUnit { health: 100, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 17.0 }) }),(GameUnit { health: 15, position: (GamePoint { x: 1.0, y: 11.0 }) }),(GameUnit { health: 8, position: (GamePoint { x: 0.0, y: 12.1 }) })] })

# retreat newstate
Retreat!
((GamePoint { x: 3.5, y: 17.0 }) : (GamePoint { x: 1.0, y: 11.0 }) : (GamePoint { x: 0.0, y: 12.1 }) : Nil)
Retreat!
((GamePoint { x: 3.5, y: 17.0 }) : (GamePoint { x: 1.0, y: 11.0 }) : (GamePoint { x: 0.0, y: 12.1 }) : Nil)

##################
Combining
##################

# battle
Take that!
*shink*
and that!
*shink*
and that!
*shink*
*srawr*
Retreat!
Retreat!
Retreat!
(Game { boss: (GameUnit { health: 199, position: (GamePoint { x: 0.0, y: 0.0 }) }), score: 0, units: [(GameUnit { health: 10, position: (GamePoint { x: 3.5, y: 67.0 }) }),(GameUnit { health: 12, position: (GamePoint { x: 1.0, y: 61.0 }) }),(GameUnit { health: 5, position: (GamePoint { x: 0.0, y: 62.1 }) })] })