61 lines
1.2 KiB
TypeScript
61 lines
1.2 KiB
TypeScript
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import { result } from '.'
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type Ok<T> = {
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type: 'ok'
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val: T
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}
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export const ok = <T>(val: T): Ok<T> => ({ type: 'ok', val })
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type Err<T> = {
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type: 'err'
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err: T
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}
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export const err = <T>(err: T): Err<T> => ({ type: 'err', err })
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export type Result<TOk, TErr> = Ok<TOk> | Err<TErr>
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export const isOk = <TOk, TErr>(r: result.Result<TOk, TErr>): boolean => {
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switch (r.type) {
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case 'ok':
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return true
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default:
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return false
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}
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}
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export const getValue = <TOk, TErr>(r: result.Result<TOk, TErr>): TOk => {
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if (r.type === 'ok') {
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return r.val
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}
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throw new Error(`couldn't get value as type is error: ${r.err}`)
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}
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export const tap = <TOk, TErr>(
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r: result.Result<TOk, TErr>,
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okFunc: (okRes: TOk) => void,
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errFunc: (errRes: TErr) => void = (err) => {
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console.log("default tap catch of error, note tap doesn't break chain")
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}
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): result.Result<TOk, TErr> => {
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switch (r.type) {
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case 'ok':
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okFunc(r.val)
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break
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case 'err':
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errFunc(r.err)
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break
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}
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return r
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}
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export const getError = <TOk, TErr = string>(
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r: result.Result<TOk, TErr>
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): TErr => {
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if (r.type === 'err') {
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return r.err
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}
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throw new Error(`couldn't get value as type is ok: ${r.val}`)
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}
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