Function assignImm

src/utils/data.ts:17–33

(target: T, source: Partial<T>)

}

export function assignImm<T>(target: T, source: Partial<T>): T {
    let keys = Object.keys(source);
    let changed = false;
    target = target ?? {} as any;
    for (let k of keys) {
        let src = (source as any)[k];
        let dst = (target as any)[k];
        if ((src === dst) ||
            (src instanceof Date && dst instanceof Date && +src === +dst) ||
            (src instanceof Vec3 && dst instanceof Vec3 && src.distSq(dst) === 0.0)
        ) {
            continue;
        }
        changed = true;
    }
    return changed ? Object.assign({}, target, source) : target;
}

export function assignImmFull<T>(target: T | null, source: T | null): T | null {
    return source && target ? assignImm(target, source) : source;