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inaba

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A collection of random utilities

github.com/shigma/inaba

shigma/inaba

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{ "version": 3, "sources": ["../src/index.ts"], "sourcesContent": ["interface Random {\n id(length?: number, radix?: number): string\n bool(probability: number): boolean\n real(upper: number): number\n real(lower: number, upper: number): number\n int(upper: number): number\n int(lower: number, upper: number): number\n splice<T>(source: T[]): T\n pick<T>(source: readonly T[]): T\n pick<T>(source: readonly T[], count: number): T[]\n shuffle<T>(source: readonly T[]): T[]\n weightedPick<T extends string>(weights: Readonly<Record<T, number>>): T\n}\n\nnamespace Random {\n export interface Static extends Random {\n chars: string\n new (get?: () => number): Random\n }\n}\n\nclass Random {\n static chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'\n\n constructor(private get = Math.random) {}\n\n id(length = 8, radix = 16) {\n let result = ''\n for (let i = 0; i < length; ++i) {\n result += Random.chars[Math.floor(Math.random() * radix)]\n }\n return result\n }\n\n bool(probability: number) {\n if (probability >= 1) return true\n if (probability <= 0) return false\n return this.get() < probability\n }\n\n real(...args: [number, number?]): number {\n const lower = args.length > 1 ? args[0] : 0\n const upper = args[args.length - 1]\n return this.get() * (upper - lower) + lower\n }\n\n int(...args: [number, number?]): number {\n return Math.floor(this.real(...args))\n }\n\n splice<T>(source: T[]) {\n return source.splice(Math.floor(this.get() * source.length), 1)[0]\n }\n\n pick<T>(source: readonly T[], count?: number) {\n if (count === undefined) return this.pick(source, 1)[0]\n const copy = source.slice()\n const result: T[] = []\n count = Math.min(copy.length, count)\n for (let i = 0; i < count; i += 1) {\n result.push(this.splice(copy))\n }\n return result\n }\n\n shuffle<T>(source: readonly T[]) {\n return this.pick(source, source.length)\n }\n\n weightedPick<T extends string>(weights: Readonly<Record<T, number>>): T {\n const total = Object.entries(weights).reduce((prev, [, curr]) => prev + (curr as number), 0)\n const pointer = this.get() * total\n let counter = 0\n for (const key in weights) {\n counter += weights[key]\n if (pointer < counter) return key\n }\n }\n}\n\nconst instance = new Random()\n\nfor (const key of ['id', 'bool', 'int', 'real', 'splice', 'pick', 'shuffle', 'weightedPick']) {\n Random[key] = instance[key].bind(instance)\n}\n\nexport = Random as Random.Static\n"], "mappings": ";;;;AAqBA,IAAM,UAAN,MAAa;AAAA,EAGX,YAAoB,MAAM,KAAK,QAAQ;AAAnB;AAAA,EAAoB;AAAA,EAExC,GAAG,SAAS,GAAG,QAAQ,IAAI;AACzB,QAAI,SAAS;AACb,aAAS,IAAI,GAAG,IAAI,QAAQ,EAAE,GAAG;AAC/B,gBAAU,QAAO,MAAM,KAAK,MAAM,KAAK,OAAO,IAAI,KAAK;AAAA,IACzD;AACA,WAAO;AAAA,EACT;AAAA,EAEA,KAAK,aAAqB;AACxB,QAAI,eAAe;AAAG,aAAO;AAC7B,QAAI,eAAe;AAAG,aAAO;AAC7B,WAAO,KAAK,IAAI,IAAI;AAAA,EACtB;AAAA,EAEA,QAAQ,MAAiC;AACvC,UAAM,QAAQ,KAAK,SAAS,IAAI,KAAK,KAAK;AAC1C,UAAM,QAAQ,KAAK,KAAK,SAAS;AACjC,WAAO,KAAK,IAAI,KAAK,QAAQ,SAAS;AAAA,EACxC;AAAA,EAEA,OAAO,MAAiC;AACtC,WAAO,KAAK,MAAM,KAAK,KAAK,GAAG,IAAI,CAAC;AAAA,EACtC;AAAA,EAEA,OAAU,QAAa;AACrB,WAAO,OAAO,OAAO,KAAK,MAAM,KAAK,IAAI,IAAI,OAAO,MAAM,GAAG,CAAC,EAAE;AAAA,EAClE;AAAA,EAEA,KAAQ,QAAsB,OAAgB;AAC5C,QAAI,UAAU;AAAW,aAAO,KAAK,KAAK,QAAQ,CAAC,EAAE;AACrD,UAAM,OAAO,OAAO,MAAM;AAC1B,UAAM,SAAc,CAAC;AACrB,YAAQ,KAAK,IAAI,KAAK,QAAQ,KAAK;AACnC,aAAS,IAAI,GAAG,IAAI,OAAO,KAAK,GAAG;AACjC,aAAO,KAAK,KAAK,OAAO,IAAI,CAAC;AAAA,IAC/B;AACA,WAAO;AAAA,EACT;AAAA,EAEA,QAAW,QAAsB;AAC/B,WAAO,KAAK,KAAK,QAAQ,OAAO,MAAM;AAAA,EACxC;AAAA,EAEA,aAA+B,SAAyC;AACtE,UAAM,QAAQ,OAAO,QAAQ,OAAO,EAAE,OAAO,CAAC,MAAM,CAAC,EAAE,IAAI,MAAM,OAAQ,MAAiB,CAAC;AAC3F,UAAM,UAAU,KAAK,IAAI,IAAI;AAC7B,QAAI,UAAU;AACd,eAAW,OAAO,SAAS;AACzB,iBAAW,QAAQ;AACnB,UAAI,UAAU;AAAS,eAAO;AAAA,IAChC;AAAA,EACF;AACF;AAzDA,IAAM,SAAN;AAAM;AAAA,OACG,QAAQ;AA0DjB,IAAM,WAAW,IAAI,OAAO;AAE5B,WAAW,OAAO,CAAC,MAAM,QAAQ,OAAO,QAAQ,UAAU,QAAQ,WAAW,cAAc,GAAG;AAC5F,SAAO,OAAO,SAAS,KAAK,KAAK,QAAQ;AAC3C;AAEA,iBAAS;", "names": [] }