Created
February 14, 2021 19:53
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type NotObject<T> = T extends object ? never : T; | |
type IndexedFlat<T> = { | |
[key in string]: NotObject<T>; | |
}; | |
type IndexedNested = { | |
[key in string]: object; | |
}; | |
type Indexed<T = unknown> = IndexedFlat<T> | IndexedNested; | |
function isIndexedObject(obj: Indexed | unknown): obj is Indexed { | |
return typeof obj === "object"; | |
} | |
function isString(str: unknown): str is String { | |
return typeof str === "string"; | |
} | |
function set( | |
object: Indexed | unknown, | |
path: string, | |
value: unknown | |
): Indexed | unknown { | |
if (!isIndexedObject(object)) { | |
return object; | |
} | |
if (!isString(path)) { | |
throw new Error("path must be string"); | |
} | |
let segments = path.split("."); | |
if (object[segments[0]]) { | |
object[segments[0]] = value; | |
} | |
let traversePath = (): Indexed => { | |
return segments.reduce((acc, val, idx, keys) => { | |
let next = keys[idx + 1]; | |
if (next) { | |
keys.shift(); | |
acc[val] = traversePath(); | |
} else { | |
acc[val] = value; | |
} | |
return Object.fromEntries(Object.entries(acc).slice(0, 1)); | |
}, {} as Indexed); | |
}; | |
object = {...object, ...traversePath()}; | |
return object; | |
} | |
console.log(set(3, "foo.bar", "baz")); // 3 | |
console.log( | |
set({foo: 5}, "bar.baz.bla", 10) // { foo: 5, bar: { baz: 10 } } | |
); |
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