Published
Edited
May 8, 2019
Importers
md`# auto-fp
import into your notebook with:
\`\`\`lang-javascript
import {map, reduce, pipe} from '@ada-lovecraft/auto-fp'
\`\`\`
`
min = Math.min
max = Math.max
curry = (arity, fn) => {
const receiver = oldArgs => (...newArgs) => {
const args = [...oldArgs, ...newArgs]
if (args.length >= arity) {
return fn(...args)
}
return receiver(args)
}
return receiver([])
}
autocurry = fn => curry(fn.length, fn)
log = (...args) => console.log(...args)
identity = d => d
pipe = (...fns) => data =>
fns.reduce((value, fn) => fn(value), data)
split = autocurry((delimiter, string) => string.split(delimiter))
join = autocurry((relimiter, arr) => arr.join(relimiter))
trace = autocurry((label, data) => {
log(`**************${label}**************`)
log(data)
log(
`**************${pipe(
split(/./g),
map(a => "*"),
join("")
)(label)}**************`
)
return data
})
map = autocurry((fn, collection) => collection.map(fn))
keys = obj => Object.keys(obj)
values = obj => Object.values(obj)
includedIn = autocurry((arr, d) => arr.includes(d))
includes = autocurry((d, arr) => includedIn(arr, d))
pick = autocurry((key, obj) => obj[key])
pickAll = key => map(pick(key))
head = pick(0)
tail = collection => {
const [head, ...tail] = collection
return tail
}
sum = collection =>
collection.reduce((total, data) => total + Number(data), 0)
sumBy = autocurry((key, collection) => {
return pipe(
pickAll(key),
sum
)(collection)
})
sort = collection => [...collection].sort()
sortBy = autocurry((key, collection) =>
[...collection].sort((a, b) => a[key] - b[key])
)
reverse = collection => [...collection].reverse()
find = autocurry((fn, collection) => collection.find(fn))
findBy = autocurry((key, value) => find(i => i[key] === value))
filter = autocurry((fn, collection) => collection.filter(fn))
filterBy = autocurry((key, value) => filter(i => i[key] === value))
compress = filter(i => i !== null)
excludeBy = autocurry((key, value) =>
filter(i => i[key] !== value)
)
count = collection => collection.length
uniq = collection =>
collection.reduce(
(uniq, data) => (includedIn(uniq)(data) ? uniq : [...uniq, data]),
[]
)
uniqBy = autocurry((key, collection) => {
collection.reduce((agg, record) => {
if (
pipe(
pickAll(key),
includes(record[key])
)(agg)
) {
return agg
}
return [...agg, record]
}, [])
})
uniqValuesBy = key =>
pipe(
pickAll(key),
uniq
)
uniqCount = key =>
pipe(
uniqValuesBy(key),
count
)
replace = autocurry((needle, replacement, str) => str.replace(needle, replacement))
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