Created
March 18, 2025 16:37
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Experimenting with low weight code to manipulate Javascript dates
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| type Props = "FullYear"| "Month"| "Date"| "Hours"| "Minutes"| "Seconds"| "Milliseconds"; | |
| type Getter = `get${Props}`; | |
| type Setter = `set${Props}`; | |
| type DeltaDate = Partial<Record<Lowercase<Props>, number | undefined>>; | |
| const getProp = (obj: DeltaDate, prop: Props) => obj[prop.toLowerCase() as Lowercase<Props>] ?? 0 | |
| export const mutateDate = (date: Date, delta: DeltaDate) => { | |
| for (const p of Object.keys(delta) as Props[]) { | |
| date[`set${p}` as Setter](date[`get${p}` as Getter]() + getProp(delta, p)); | |
| } | |
| } | |
| export const changeDate = (date: Date, delta: DeltaDate) => { | |
| const d = new Date(date); | |
| for (const p of Object.keys(delta) as Props[]) { | |
| d[`set${p}` as Setter](date[`get${p}` as Getter]() + getProp(delta, p)); | |
| } | |
| return d; | |
| } |
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