Created
March 29, 2021 06:19
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Typescript generic "make a compare function" function that takes a lambda, expected to return the property to compare (normally).
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| /* Create a function used with `sort()` to sort arrays of objects | |
| * for example: | |
| * const sortByLastName = makeCompareFunction<Person>(p => p.lastName); | |
| * people.sort(sortByLastName); | |
| */ | |
| export function makeCompareFunction<T>(lambda: (obj: T) => string | number) { | |
| return (a: T, b: T): number => { | |
| const _a = lambda(a); | |
| const _b = lambda(b); | |
| if (_a < _b) { | |
| return -1; | |
| } | |
| if (_a > _b) { | |
| return 1; | |
| } | |
| return 0; | |
| }; | |
| } |
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