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Add more functions
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parent
8caeacff62
commit
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80
npm/index.js
80
npm/index.js
@ -90,6 +90,14 @@ async function transform(json, code) {
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return (${fold(code.split('[]'))})(this)
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})`).call(json)
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function fold(s) {
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if (s.length === 1)
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return 'x => x' + s[0]
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let obj = s.shift()
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obj = obj === '.' ? 'x' : 'x' + obj
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return `x => Object.values(${obj}).flatMap(${fold(s)})`
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}
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if (/^\.\[/.test(code))
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return eval(`(function () {
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return this${code.substring(1)}
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@ -100,7 +108,7 @@ async function transform(json, code) {
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return this${code}
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})`).call(json)
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if (/^map\(.+?\)$/.test(code)) {
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if (/^[a-z]+\(.+?\)$/i.test(code)) {
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let s = code.substring(4, code.length - 1)
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if (s[0] === '.') s = 'x' + s
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return eval(`(function () {
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@ -113,40 +121,48 @@ async function transform(json, code) {
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return ${code}
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})`).call(json)
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return apply(fn, json)
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function apply(fn, ...args) {
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if (typeof fn === 'function') return fn(...args)
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return fn
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}
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function fold(s) {
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if (s.length === 1)
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return 'x => x' + s[0]
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let obj = s.shift()
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obj = obj === '.' ? 'x' : 'x' + obj
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return `x => Object.values(${obj}).flatMap(${fold(s)})`
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return apply(fn, json)
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function len(x) {
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if (Array.isArray(x)) return x.length
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if (typeof x === 'string') return x.length
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if (typeof x === 'object' && x !== null) return Object.keys(x).length
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throw new Error(`Cannot get length of ${typeof x}`)
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}
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function len(array) {
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return array.length
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function uniq(x) {
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if (Array.isArray(x)) return [...new Set(x)]
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throw new Error(`Cannot get unique values of ${typeof x}`)
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}
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function uniq(array) {
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return [...new Set(array)]
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function sort(x) {
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if (Array.isArray(x)) return x.sort()
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throw new Error(`Cannot sort ${typeof x}`)
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}
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function sort(array) {
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return array.sort()
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function sortBy(func) {
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return function (x) {
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if (Array.isArray(x)) return x.sort((a, b) => {
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const fa = func(a)
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const fb = func(b)
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return fa < fb ? -1 : fa > fb ? 1 : 0
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})
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throw new Error(`Cannot sort ${typeof x}`)
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}
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}
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function groupBy(keyOrFunction) {
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return array => {
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function groupBy(keyFn) {
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return function (x) {
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const grouped = {}
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for (const item of array) {
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const key = typeof keyOrFunction === 'function'
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? keyOrFunction(item)
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: item[keyOrFunction]
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for (const item of x) {
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const key = typeof keyFn === 'function'
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? keyFn(item)
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: item[keyFn]
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if (!grouped.hasOwnProperty(key))
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grouped[key] = []
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grouped[key].push(item)
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@ -156,24 +172,34 @@ async function transform(json, code) {
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}
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function chunk(size) {
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return function (arr) {
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return function (x) {
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const res = []
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let i = 0
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while (i < arr.length) {
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res.push(arr.slice(i, i += size))
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while (i < x.length) {
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res.push(x.slice(i, i += size))
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}
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return res
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}
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}
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function zip(...arrays) {
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const length = Math.min(...arrays.map(a => a.length))
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function zip(...x) {
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const length = Math.min(...x.map(a => a.length))
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const res = []
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for (let i = 0; i < length; i++) {
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res.push(arrays.map(a => a[i]))
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res.push(x.map(a => a[i]))
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}
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return res
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}
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function flatten(x) {
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if (Array.isArray(x)) return x.flat()
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throw new Error(`Cannot flatten ${typeof x}`)
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}
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function reverse(x) {
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if (Array.isArray(x)) return x.reverse()
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throw new Error(`Cannot reverse ${typeof x}`)
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}
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}
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async function read(fd = 0) {
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