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Executing multiple steps to handle a purchase using currying
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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
$begingroup$
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) {
const hasItems = Array.isArray(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
edited 2 days ago
200_success
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
$endgroup$
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) {
const hasItems = Array.isArray(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
edited 2 days ago
200_success
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
$endgroup$
$begingroup$
Currying is converting a function takingnarguments into series ofn-1functions each taking 1 argument. For example, curryingfoo = (a, b, c) => ...would befoo = a => b => c => .... Maybe you could clarify to which function do you refer to.
$endgroup$
– morbusg
2 days 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 areturn 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
2 days ago
$begingroup$
@morbusg I usestepsinstead ofargumentsfor thenseries of functions, andinvoke()is being called over the series of functions.
$endgroup$
– Jared Farrish
2 days 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) {
const hasItems = Array.isArray(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
edited 2 days ago
200_success
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
$endgroup$
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) {
const hasItems = Array.isArray(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
javascript functional-programming e-commerce
edited 2 days ago
200_success
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
edited 2 days ago
200_success
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
edited 2 days ago
200_success
131k17157422
edited 2 days ago
200_success
131k17157422
edited 2 days ago
200_success
131k17157422
131k17157422
asked 2 days ago
Jared FarrishJared Farrish
22517
asked 2 days ago
Jared FarrishJared Farrish
22517
asked 2 days ago
Jared FarrishJared Farrish
22517
22517
$begingroup$
Currying is converting a function takingnarguments into series ofn-1functions each taking 1 argument. For example, curryingfoo = (a, b, c) => ...would befoo = a => b => c => .... Maybe you could clarify to which function do you refer to.
$endgroup$
– morbusg
2 days 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 areturn 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
2 days ago
$begingroup$
@morbusg I usestepsinstead ofargumentsfor thenseries of functions, andinvoke()is being called over the series of functions.
$endgroup$
– Jared Farrish
2 days ago
add a comment |
$begingroup$
Currying is converting a function takingnarguments into series ofn-1functions each taking 1 argument. For example, curryingfoo = (a, b, c) => ...would befoo = a => b => c => .... Maybe you could clarify to which function do you refer to.
$endgroup$
– morbusg
2 days 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 areturn 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
2 days ago
$begingroup$
@morbusg I usestepsinstead ofargumentsfor thenseries of functions, andinvoke()is being called over the series of functions.
$endgroup$
– Jared Farrish
2 days ago
$begingroup$
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
2 days ago
$begingroup$
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
2 days ago
1
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
2 days ago
$begingroup$
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
2 days 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
2 days 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
2 days ago
add a comment |
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$begingroup$
Currying is converting a function taking
narguments into series ofn-1functions each taking 1 argument. For example, curryingfoo = (a, b, c) => ...would befoo = a => b => c => .... Maybe you could clarify to which function do you refer to.$endgroup$
– morbusg
2 days 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
2 days ago
$begingroup$
@morbusg I use
stepsinstead ofargumentsfor thenseries of functions, andinvoke()is being called over the series of functions.$endgroup$
– Jared Farrish
2 days ago