Naive implementation of lodash.omit

omit.js

export function omitSingle(object = {}, key) {
    if (key === null || key === undefined || !(key in object)) return object;
    const { [key]: deleted, ...otherKeys } = object;
    return otherKeys;
}

export function omitMultiple(object = {}, keys) {
    if (!Array.isArray(keys)) return object;
    return keys.reduce((result, key) => {
        if (key in result) {
            return omitSingle(result, key);
        }
        return result;
    }, object);
}

export default function omit(object = {}, keys) {
    if (!keys) return object;
    if (Array.isArray(keys)) {
        // calling omitMultiple here would result in a second array check
        return keys.reduce((result, key) => {
            if (key in result) {
                return omitSingle(result, key);
            }
            return result;
        }, object);
    }
    return omitSingle(object, keys);
}