Put everything in src directories
This commit is contained in:
Jon Staab
@@ -0,0 +1,360 @@
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import {throttle} from 'throttle-debounce'
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import {bech32, utf8} from "@scure/base"
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// Dealing with nil
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export type Nil = null | undefined
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export const isNil = (x: any) => [null, undefined].includes(x)
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// Regular old utils
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export const now = () => Math.round(Date.now() / 1000)
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export const first = <T>(xs: T[], ...args: unknown[]) => xs[0]
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export const last = <T>(xs: T[], ...args: unknown[]) => xs[xs.length - 1]
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export const identity = <T>(x: T, ...args: unknown[]) => x
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export const always = <T>(x: T, ...args: unknown[]) => () => x
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export const inc = (x: number | Nil) => (x || 0) + 1
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export const dec = (x: number | Nil) => (x || 0) - 1
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export const max = (xs: number[]) => xs.reduce((a, b) => Math.max(a, b), 0)
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export const min = (xs: number[]) => xs.reduce((a, b) => Math.min(a, b), 0)
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export const sum = (xs: number[]) => xs.reduce((a, b) => a + b, 0)
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export const avg = (xs: number[]) => sum(xs) / xs.length
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export const drop = <T>(n: number, xs: T[]) => xs.slice(n)
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export const take = <T>(n: number, xs: T[]) => xs.slice(0, n)
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export const omit = <T extends Record<string, any>>(ks: string[], x: T) => {
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const r: T = {...x}
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for (const k of ks) {
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delete r[k]
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}
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return r
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}
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export const pick = <T extends Record<string, any>>(ks: string[], x: T) => {
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const r: T = {...x}
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for (const k of Object.keys(x)) {
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if (!ks.includes(k)) {
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delete r[k]
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}
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}
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return r
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}
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export function* range(a: number, b: number, step = 1) {
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for (let i = a; i < b; i += step) {
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yield i
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}
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}
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export const mapKeys = <T extends Record<string, any>>(f: (v: string) => string, x: T) => {
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const r: Record<string, any> = {}
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for (const [k, v] of Object.entries(x)) {
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r[f(k)] = v
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}
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return r as T
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}
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export const mapVals = <T extends Record<string, any>>(f: (v: any) => any, x: T) => {
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const r: Record<string, any> = {}
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for (const [k, v] of Object.entries(x)) {
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r[k] = f(v)
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}
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return r as T
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}
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export const between = (low: number, high: number, n: number) => n > low && n < high
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export const randomId = (): string => Math.random().toString().slice(2)
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export const stripProtocol = (url: string) => url.replace(/.*:\/\//, "")
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export const sleep = (t: number) => new Promise(resolve => setTimeout(resolve, t))
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export const concat = <T>(...xs: (T | Nil)[][]) => xs.flatMap(x => x || [])
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export const append = <T>(xs: (T | Nil)[], x: T) => concat(xs, [x])
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export const union = <T>(a: T[], b: T[]) => uniq([...a, ...b])
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export const intersection = <T>(a: T[], b: T[]) => {
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const s = new Set(b)
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return a.filter(x => s.has(x))
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}
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export const difference = <T>(a: T[], b: T[]) => {
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const s = new Set(b)
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return a.filter(x => !s.has(x))
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}
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export const remove = <T>(a: T, b: T[]) => b.filter(x => x !== a)
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export const without = <T>(a: T[], b: T[]) => b.filter(x => !a.includes(x))
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export const clamp = ([min, max]: [number, number], n: number) => Math.min(max, Math.max(min, n))
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export const tryCatch = async <T>(f: () => Promise<T | void> | T | void, onError?: (e: Error) => void): Promise<T | void> => {
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try {
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return await f()
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} catch (e) {
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onError?.(e as Error)
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}
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return undefined
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}
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// Curried utils
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export const nth = (i: number) => <T>(xs: T[], ...args: unknown[]) => xs[i]
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export const nthEq = (i: number, v: any) => (xs: any[], ...args: unknown[]) => xs[i] === v
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export const eq = <T>(v: T) => (x: T) => x === v
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export const ne = <T>(v: T) => (x: T) => x !== v
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export const prop = (k: string) => <T>(x: Record<string, T>) => x[k]
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export const assoc = <K extends string, T, U>(k: K, v: T) => (o: U) => ({...o, [k as K]: v}) as U & Record<K, T>
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export const hash = (s: string) =>
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Math.abs(s.split("").reduce((a, b) => ((a << 5) - a + b.charCodeAt(0)) | 0, 0)).toString()
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// Collections
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export const splitAt = <T>(n: number, xs: T[]) => [xs.slice(0, n), xs.slice(n)]
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export const choice = <T>(xs: T[]): T => xs[Math.floor(xs.length * Math.random())]
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export const shuffle = <T>(xs: Iterable<T>): T[] => Array.from(xs).sort(() => Math.random() > 0.5 ? 1 : -1)
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export const isIterable = (x: any) => Symbol.iterator in Object(x)
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export const toIterable = (x: any) => isIterable(x) ? x : [x]
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export const ensurePlural = <T>(x: T | T[]) => (x instanceof Array ? x : [x])
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export const ensureNumber = (x: number | string) => parseFloat(x as string)
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export const fromPairs = <T>(pairs: [k?: string, v?: T, ...args: unknown[]][]) => {
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const r: Record<string, T> = {}
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for (const [k, v] of pairs) {
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if (k && v) {
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r[k] = v
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}
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}
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return r
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}
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export const flatten = <T>(xs: T[][]) => xs.flatMap(identity)
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export const partition = <T>(f: (x: T) => boolean, xs: T[]) => {
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const a: T[] = []
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const b: T[] = []
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for (const x of xs) {
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if (f(x)) {
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a.push(x)
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} else {
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b.push(x)
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}
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}
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return [a, b]
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}
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export const uniq = <T>(xs: T[]) => Array.from(new Set(xs))
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export const uniqBy = <T>(f: (x: T) => any, xs: T[]) => {
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const s = new Set<any>()
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const r = []
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for (const x of xs) {
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const k = f(x)
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if (s.has(k)) {
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continue
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}
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s.add(k)
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r.push(x)
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}
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return r
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}
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export const sort = <T>(xs: T[]) => [...xs].sort()
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export const sortBy = <T>(f: (x: T) => number, xs: T[]) =>
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[...xs].sort((a: T, b: T) => f(a) - f(b))
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export const groupBy = <T, K>(f: (x: T) => K, xs: T[]) => {
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const r = new Map<K, T[]>()
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for (const x of xs) {
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const k = f(x)
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let v = r.get(k)
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if (!v) {
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v = []
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r.set(k, v)
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}
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v.push(x)
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}
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return r
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}
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export const indexBy = <T, K>(f: (x: T) => K, xs: T[]) => {
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const r = new Map<K, T>()
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for (const x of xs) {
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r.set(f(x), x)
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}
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return r
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}
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export const sample = <T>(n: number, xs: T[]) => {
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const result: T[] = []
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const limit = Math.min(n, xs.length)
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for (let i = 0; i < limit; i++) {
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result.push(xs.splice(Math.floor(xs.length * Math.random()), 1)[0])
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}
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return result
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}
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export const initArray = <T>(n: number, f: () => T) => {
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const result = []
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for (let i = 0; i < n; i++) {
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result.push(f())
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}
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return result
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}
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export const chunk = <T>(chunkLength: number, xs: T[]) => {
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const result: T[][] = []
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const current: T[] = []
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for (const item of xs) {
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if (current.length < chunkLength) {
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current.push(item)
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} else {
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result.push(current.splice(0))
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}
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}
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if (current.length > 0) {
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result.push(current)
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}
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return result
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}
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export const chunks = <T>(n: number, xs: T[]) => {
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const result: T[][] = initArray(n, () => [])
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for (let i = 0; i < xs.length; i++) {
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result[i % n].push(xs[i])
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}
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return result
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}
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export const once = (f: (...args: any) => void) => {
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let called = false
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return (...args: any) => {
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if (!called) {
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called = true
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f(...args)
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}
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}
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}
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export const batch = <T>(t: number, f: (xs: T[]) => void) => {
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const xs: T[] = []
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const cb = throttle(t, () => xs.length > 0 && f(xs.splice(0)))
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return (x: T) => {
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xs.push(x)
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cb()
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}
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}
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export const addToKey = <T>(m: Record<string, Set<T>>, k: string, v: T) => {
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const s = m[k] || new Set<T>()
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s.add(v)
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m[k] = s
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}
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export const pushToKey = <T>(m: Record<string, T[]>, k: string, v: T) => {
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const a = m[k] || []
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a.push(v)
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m[k] = a
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}
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export const addToMapKey = <K, T>(m: Map<K, Set<T>>, k: K, v: T) => {
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const s = m.get(k) || new Set<T>()
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s.add(v)
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m.set(k, s)
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}
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export const pushToMapKey = <K, T>(m: Map<K, T[]>, k: K, v: T) => {
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const a = m.get(k) || []
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a.push(v)
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m.set(k, a)
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}
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// Random obscure stuff
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export const hexToBech32 = (prefix: string, url: string) =>
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bech32.encode(prefix, bech32.toWords(utf8.decode(url)), false)
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export const bech32ToHex = (b32: string) =>
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utf8.encode(bech32.fromWords(bech32.decode(b32, false).words))
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// https://github.com/microsoft/TypeScript/issues/4628#issuecomment-1147905253
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export type OmitStatics<T, S extends string> =
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T extends {new(...args: infer A): infer R} ?
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{new(...args: A): R}&Omit<T, S> :
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Omit<T, S>;
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// https://github.com/microsoft/TypeScript/issues/4628#issuecomment-1147905253
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export type OmitAllStatics<T extends {new(...args: any[]): any, prototype: any}> =
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T extends {new(...args: infer A): infer R, prototype: infer P} ?
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{new(...args: A): R, prototype: P} :
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never;
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