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May 24, 2023 20:12
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| import clone_deep from "lodash.clonedeep" | |
| /** | |
| * dicts are homogeneous- their values must be of the same type | |
| * records can hold values of different types | |
| */ | |
| type t = Record<string, unknown> | object | |
| export { clone_deep } | |
| /** | |
| * First object contains key/value pairs that pass the predicate. | |
| * Secoond object contains key/value pairs that failed. | |
| * x:xs | |
| * r:rs | |
| * d:ds | |
| * @param xs | |
| * @param predicate | |
| * @returns | |
| */ | |
| export const partition = <R extends t>( | |
| r: R, | |
| predicate: (key: keyof R) => boolean | |
| ) => { | |
| const passed = {} as R | |
| const failed = {} as R | |
| for (const key in r) { | |
| if (predicate(key)) passed[key] = r[key] | |
| else failed[key] = r[key] | |
| } | |
| return [passed, failed] as const | |
| } | |
| /** | |
| * Determine if an object is empty. | |
| * @param obj | |
| * @returns | |
| */ | |
| export const is_empty = <T extends t>(obj: T) => { | |
| return ( | |
| !obj || | |
| (Object.keys(obj).length === 0 && (obj as any).constructor === Object) | |
| ) | |
| } | |
| /** | |
| * Merge two objects | |
| * @param o1 | |
| * @param o2 | |
| * @returns | |
| */ | |
| export const merge = <O1, O2>(o1: O1, o2: O2) => ({ ...o1, ...o2 }) | |
| /** | |
| * Shallow clone an object | |
| * @param r | |
| * @returns | |
| */ | |
| export const clone = <R extends t>(r: R) => ({ ...r }) | |
| /** | |
| * Return an object with a subset of properties. | |
| * @param r | |
| * @param paths | |
| */ | |
| export const pick = <R extends t, U extends keyof R>( | |
| r: R, | |
| paths: Array<U> | |
| ): Pick<R, U> => | |
| Object.entries(r).reduce( | |
| (store, [key, value]) => | |
| paths.includes(key as U) ? { ...store, [key]: value } : store, | |
| {} as Pick<R, U> | |
| ) | |
| /** | |
| * Return an object with a subset of properties. | |
| * @param r | |
| * @param paths | |
| */ | |
| export const omit = <R extends Record<string, any>, U extends keyof R>( | |
| r: R, | |
| paths: Array<U> | |
| ): Omit<R, U> => { | |
| if (!r) { | |
| throw new Error("[omit] item was not an object") | |
| } | |
| return Object.entries(r).reduce((store, [key, value]) => { | |
| if (paths.includes(key as U)) { | |
| return store | |
| } else { | |
| store[key as keyof Omit<R, U>] = value as any | |
| return store | |
| } | |
| }, {} as Omit<R, U>) | |
| } |
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