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92 lines
2.1 KiB
JavaScript
92 lines
2.1 KiB
JavaScript
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 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 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 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 map(fn) {
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return function (x) {
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if (Array.isArray(x)) return x.map((v, i) => fn(v, i))
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throw new Error(`Cannot map ${typeof x}`)
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}
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}
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function sortBy(fn) {
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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 = fn(a)
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const fb = fn(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(keyFn) {
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return function (x) {
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const grouped = {}
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for (const item of x) {
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const key = typeof keyFn === 'function' ? keyFn(item) : item[keyFn]
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if (!grouped.hasOwnProperty(key)) grouped[key] = []
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grouped[key].push(item)
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}
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return grouped
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}
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}
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function chunk(size) {
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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 < 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(...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(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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function keys(x) {
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if (typeof x === 'object' && x !== null) return Object.keys(x)
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throw new Error(`Cannot get keys of ${typeof x}`)
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}
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function values(x) {
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if (typeof x === 'object' && x !== null) return Object.values(x)
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throw new Error(`Cannot get values of ${typeof x}`)
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}
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