/*---------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All rights reserved.

* Licensed under the MIT License. See License.txt in the project root for license information.

*--------------------------------------------------------------------------------------------*/

'use strict';

const _typeof = {

number: 'number',

string: 'string',

undefined: 'undefined',

object: 'object',

function: 'function',

};

/**

* @returns whether the provided parameter is a JavaScript Array or not.

*/

export function isArray(array: any): array is any[] {

if (Array.isArray) {

return Array.isArray(array);

}

if (array && typeof array.length === _typeof.number && array.constructor === Array) {

return true;

}

return false;

}

/**

* @returns whether the provided parameter is a JavaScript String or not.

*/

export function isString(str: any): str is string {

if (typeof str === _typeof.string || str instanceof String) {

return true;

}

return false;

}

/**

*

* @returns whether the provided parameter is of type `object` but **not**

* `null`, an `array`, a `regexp`, nor a `date`.

*/

export function isObject(obj: any): obj is any {

return (

typeof obj === _typeof.object &&

obj !== null &&

!Array.isArray(obj) &&

!(obj instanceof RegExp) &&

!(obj instanceof Date)

);

}

/**

* In **contrast** to just checking `typeof` this will return `false` for `NaN`.

* @returns whether the provided parameter is a JavaScript Number or not.

*/

export function isNumber(obj: any): obj is number {

if ((typeof obj === _typeof.number || obj instanceof Number) && !isNaN(obj)) {

return true;

}

return false;

}