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/** * repr :: gets the string representation of `arg` * @param {} arg :: unknown function argument * @returns {String} :: a string representation of `arg` */ export const repr = (arg) => { return Object.prototype.toString.call(arg); }; /** * isArray * @param {} arg :: unknown function argument * @returns {Boolean} :: returns true if `arg` is an Array, false otherwise */ export const isArray = (arg) => { return Array.isArray ? Array.isArray(arg) : repr(arg) === "[object Array]"; }; /** * isObject :: checks if `arg` is an object. * @param {} arg :: unknown function argument * @returns {Boolean} :: returns true if `arg` is an object. */ export const isObject = (arg) => { return repr(arg) === "[object Object]"; }; /** * isString :: checks if `arg` is a string. * @param {} arg :: unknown function argument * @returns {Boolean} :: returns true if `arg` is a String, false otherwise */ export const isString = (arg) => { return repr(arg) === "[object String]"; }; /** * isNumber :: checks if `arg` is a number. * @param {} arg :: unknown function argument * @returns {Boolean} :: returns true if `arg` is a Number, false otherwise */ export const isNumber = (arg) => { return repr(arg) === "[object Number]"; }; export const isFloat = (n) => { return Number(n) === n && n % 1 !== 0; }; /** * isNull :: checks if `arg` is null. * @param {} arg :: unknown function argument * @returns {Boolean} :: returns true if `arg` is of type Null, false otherwise */ export const isNull = (arg) => { return repr(arg) === "[object Null]"; }; /** * isUndefined :: checks if `arg` is undefined. * @param {} arg :: unknown function argument * @returns {Boolean} :: Returns true if `arg` is of type Undefined, false otherwise */ export const isUndefined = (arg) => { try { return typeof arg === "undefined"; } catch (e) { if (e instanceof ReferenceError) { return true; } throw e; } }; /** * isEmpty :: Checks if `arg` is an empty string, array, or object. * * @param {} arg :: unknown function argument * @returns {Boolean} :: Returns true if `arg` is an empty string, * array, or object. Also returns true is `arg` is null or * undefined. Returns true otherwise. */ export const isEmpty = (arg) => { return ( isUndefined(arg) || isNull(arg) || (isString(arg) && arg.length === 0) || (isArray(arg) && arg.length === 0) || (isObject(arg) && Object.keys(arg).length === 0) ); };
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