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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)
);
};