collectable/lib/module/functions/set.js

An all-you-can-eat buffet of high-performance immutable/persistent data structures

import { isCollection, batch } from '@collectable/core';
import { fromArray } from '@collectable/map';
import { isIndexable } from '../internals';
export function setIn(path, value, collection) {
    batch.start();
    collection = setDeep(collection, path, 0, value);
    batch.end();
    return collection;
}
function setDeep(collection, path, keyidx, value) {
    var key = path[keyidx], type;
    batch.start();
    if (isCollection(collection) && (type = collection['@@type'], isIndexable(type)) && type.verifyKey(key, collection)) {
        return keyidx === path.length - 1
            ? type.set(key, value, collection)
            : type.update(key, c => setDeep(c, path, keyidx + 1, value), collection);
    }
    return fromArray([[key, keyidx === path.length - 1 ? value : setDeep(void 0, path, keyidx + 1, value)]]);
}

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