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Executing multiple steps to handle a purchase using currying

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2

$begingroup$

Is doing something like this utilizing currying in a practical sense?

function processOneClickPurchase(item) 
 let context = step: 0 

 let addItemToCart = item => 
 let cart = getSession().cart
 cart.items.push(item)
 log('Cart items', cart.items)
 return cart
 

 ...

 let purchase = generate([
 addItemToCart,
 makePurchase,
 processBilling,
 setupShipping,
 sendPurchaseAndShippingNotification,
 ], null, cleanup)

 return purchase(item)

 function generate(steps, before, after) 
 const takeStep = (incoming, outgoing) => 
 let message = 
 step: ++context.step,
 incoming: incoming,
 outgoing: outgoing
 ;

 log('step #'+(context.step), message)

 return outgoing
 
 const walk = value => 
 return steps.reduce((from, to) => 
 return takeStep(from, to(from))
 , value)
 

 (before && steps.push(before)) + (after && steps.push(after))

 return function invoke(state) !(state = [state])
 const processed = state.map(walk)
 return hasItems ? processed : processed[0]
 
 

https://jsfiddle.net/f7mdak6z/25/

I realize there's algebra going on with currying and maybe this is nonsensical, so we're not talking rigid math concepts. However, it seems to me this pattern is rudimentary and it feels like an application of currying over an input to achieve an output. takeStep() almost seems like a monad, etc.

I think it would definitely start to sound like a fit if the methods passed to generate() simply modified the stream, and perhaps the takeStep() function handled side-effects.

javascript functional-programming e-commerce

share|improve this question

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Currying is converting a function taking n arguments into series of n-1 functions each taking 1 argument. For example, currying foo = (a, b, c) => ... would be foo = a => b => c => .... Maybe you could clarify to which function do you refer to.
  $endgroup$
  – morbusg
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  What does this code accomplish? Please tell us, and also make that the title of the question, as per the How to Ask guidelines. Note that there is a return purchase(item) that doesn't make sense since it's not within a function — please ensure that you have included enough code for the question to make sense.
  $endgroup$
  – 200_success
  5 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @morbusg I use steps instead of arguments for the n series of functions, and invoke() is being called over the series of functions.
  $endgroup$
  – Jared Farrish
  1 hour ago
  
  

  
  
  
  

add a comment | 

2

$begingroup$

Is doing something like this utilizing currying in a practical sense?

function processOneClickPurchase(item) 
 let context = step: 0 

 let addItemToCart = item => 
 let cart = getSession().cart
 cart.items.push(item)
 log('Cart items', cart.items)
 return cart
 

 ...

 let purchase = generate([
 addItemToCart,
 makePurchase,
 processBilling,
 setupShipping,
 sendPurchaseAndShippingNotification,
 ], null, cleanup)

 return purchase(item)

 function generate(steps, before, after) 
 const takeStep = (incoming, outgoing) => 
 let message = 
 step: ++context.step,
 incoming: incoming,
 outgoing: outgoing
 ;

 log('step #'+(context.step), message)

 return outgoing
 
 const walk = value => 
 return steps.reduce((from, to) => 
 return takeStep(from, to(from))
 , value)
 

 (before && steps.push(before)) + (after && steps.push(after))

 return function invoke(state) !(state = [state])
 const processed = state.map(walk)
 return hasItems ? processed : processed[0]
 
 

https://jsfiddle.net/f7mdak6z/25/

I realize there's algebra going on with currying and maybe this is nonsensical, so we're not talking rigid math concepts. However, it seems to me this pattern is rudimentary and it feels like an application of currying over an input to achieve an output. takeStep() almost seems like a monad, etc.

I think it would definitely start to sound like a fit if the methods passed to generate() simply modified the stream, and perhaps the takeStep() function handled side-effects.

javascript functional-programming e-commerce

share|improve this question

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Currying is converting a function taking n arguments into series of n-1 functions each taking 1 argument. For example, currying foo = (a, b, c) => ... would be foo = a => b => c => .... Maybe you could clarify to which function do you refer to.
  $endgroup$
  – morbusg
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  What does this code accomplish? Please tell us, and also make that the title of the question, as per the How to Ask guidelines. Note that there is a return purchase(item) that doesn't make sense since it's not within a function — please ensure that you have included enough code for the question to make sense.
  $endgroup$
  – 200_success
  5 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @morbusg I use steps instead of arguments for the n series of functions, and invoke() is being called over the series of functions.
  $endgroup$
  – Jared Farrish
  1 hour ago
  
  

  
  
  
  

add a comment | 

$begingroup$

Is doing something like this utilizing currying in a practical sense?

function processOneClickPurchase(item) 
 let context = step: 0 

 let addItemToCart = item => 
 let cart = getSession().cart
 cart.items.push(item)
 log('Cart items', cart.items)
 return cart
 

 ...

 let purchase = generate([
 addItemToCart,
 makePurchase,
 processBilling,
 setupShipping,
 sendPurchaseAndShippingNotification,
 ], null, cleanup)

 return purchase(item)

 function generate(steps, before, after) 
 const takeStep = (incoming, outgoing) => 
 let message = 
 step: ++context.step,
 incoming: incoming,
 outgoing: outgoing
 ;

 log('step #'+(context.step), message)

 return outgoing
 
 const walk = value => 
 return steps.reduce((from, to) => 
 return takeStep(from, to(from))
 , value)
 

 (before && steps.push(before)) + (after && steps.push(after))

 return function invoke(state) !(state = [state])
 const processed = state.map(walk)
 return hasItems ? processed : processed[0]
 
 

https://jsfiddle.net/f7mdak6z/25/

I realize there's algebra going on with currying and maybe this is nonsensical, so we're not talking rigid math concepts. However, it seems to me this pattern is rudimentary and it feels like an application of currying over an input to achieve an output. takeStep() almost seems like a monad, etc.

I think it would definitely start to sound like a fit if the methods passed to generate() simply modified the stream, and perhaps the takeStep() function handled side-effects.

javascript functional-programming e-commerce

share|improve this question

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

$endgroup$

function processOneClickPurchase(item) 
 let context = step: 0 

 let addItemToCart = item => 
 let cart = getSession().cart
 cart.items.push(item)
 log('Cart items', cart.items)
 return cart
 

 ...

 let purchase = generate([
 addItemToCart,
 makePurchase,
 processBilling,
 setupShipping,
 sendPurchaseAndShippingNotification,
 ], null, cleanup)

 return purchase(item)

 function generate(steps, before, after) 
 const takeStep = (incoming, outgoing) => 
 let message = 
 step: ++context.step,
 incoming: incoming,
 outgoing: outgoing
 ;

 log('step #'+(context.step), message)

 return outgoing
 
 const walk = value => 
 return steps.reduce((from, to) => 
 return takeStep(from, to(from))
 , value)
 

 (before && steps.push(before)) + (after && steps.push(after))

 return function invoke(state) !(state = [state])
 const processed = state.map(walk)
 return hasItems ? processed : processed[0]
 
 

share|improve this question

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

share|improve this question

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

edited 1 min ago

200_success

131k17157422

edited 1 min ago

200_success

131k17157422

asked 11 hours ago

Jared FarrishJared Farrish

22517

asked 11 hours ago

Jared FarrishJared Farrish

22517