【Tool】常用方法

*判斷為空

const isEmpty = (val) => {
    // null or undefined
    if (val == null) return true;

    if (typeof val === "boolean") return false;

    if (typeof val === "number") return !val;

    if (val instanceof Error) return val.message === "";

    // eslint-disable-next-line default-case
    switch (Object.prototype.toString.call(val)) {
        // String or Array
        case "[object String]":
        case "[object Array]":
            return !val.length;

        // Map or Set or File
        case "[object File]":
        case "[object Map]":
        case "[object Set]": {
            return !val.size;
        }
        // Plain Object
        case "[object Object]": {
            return !Object.keys(val).length;
        }
    }

    return false;
};

const isNotEmpty = (val) => {
    return !isEmpty(val);
};