export function isIterable(arg: any): arg is Iterable<any> {
    return arg != null && typeof arg[Symbol.iterator] === 'function';
}

export function isArrayLike(arg: any): arg is ArrayLike<any> {
    return arg != null && typeof arg.length === 'number' && typeof arg !== 'function';
}

export function isObject(arg: any): arg is Object {
    return typeof arg === 'object' && arg !== null;
}

export function isNull(arg: any): arg is null {
    return arg === null;
}

export function isUndefined(arg: any): arg is undefined {
    return arg === void 0;
}

export function isString(arg: any): arg is string {
    return typeof arg === 'string';
}

export function isNumber(arg: any): arg is number {
    return typeof arg === 'number';
}

export function isFunction(arg: any): arg is Function {
    return typeof arg === 'function';
}

export function isBoolean(arg: any): arg is boolean {
    return typeof arg === 'boolean';
}

export function isSymbol(arg: any): arg is symbol {
    return typeof arg === 'symbol';
}

export function isArray(arg: any): arg is any[] {
    return Array.isArray(arg);
}