Jon Staab
36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
export const now = () => Math.round(Date.now() / 1000)
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export const nth = (i: number) => <T>(xs: T[]) => xs[i]
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export const first = <T>(xs: T[]) => xs[0]
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export const last = <T>(xs: T[]) => xs[xs.length - 1]
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export const identity = <T>(x: T) => x
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export const between = (low: number, high: number, n: number) => n > low && n < high
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export const flatten = <T>(xs: T[]) => xs.flatMap(identity)
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export const uniq = <T>(xs: T[]) => Array.from(new Set(xs))
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export const shuffle = <T>(xs: T[]): T[] => 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 stripProtocol = (url: string) => url.replace(/.*:\/\//, "")
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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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