38 lines
1.1 KiB
TypeScript
38 lines
1.1 KiB
TypeScript
type Simplify<T, K = any> = string |
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T extends string ? string :
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T extends number ? number :
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T extends boolean ? boolean :
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T extends Array<K> ? Array<K> :
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T extends Object ? Object : any;
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export type Jsonified<T> = { [K in keyof T]: Simplify<T[K]> }
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export type Optionalify<T> = { [K in keyof T]?: T[K] }
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export type Index = string | symbol | number;
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export function map<T extends {}, KT extends keyof T, R extends { [KR in keyof T] }>(source: T, mapper: (value: T[KT], key: KT) => R[KT]): R {
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const result: R = {} as R;
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for (const [key, value] of Object.entries(source)) {
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result[key] = mapper(value as T[KT], key as KT);
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}
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return result;
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}
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export function filter<T, KT extends keyof T>(source: T, filter: (value: T[KT], key: KT) => boolean): Optionalify<T> {
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const result: Optionalify<T> = {};
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for (const [key, value] of Object.entries(source)) {
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if (filter(value as T[KT], key as KT)) {
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result[key] = value;
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}
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}
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return result;
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}
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export function signed(number: number): string {
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return number > 0 ? `+${number}` : number.toString();
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}
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