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sysTypes.ts
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124 lines (103 loc) · 3.38 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
'use strict';
// tslint:disable:rule1 no-any no-unnecessary-callback-wrapper jsdoc-format no-for-in prefer-const no-increment-decrement
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 a JavaScript Array and each element in the array is a string.
*/
export function isStringArray(value: any): value is string[] {
return isArray(value) && (<any[]>value).every(elem => isString(elem));
}
/**
*
* @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;
}
/**
* @returns whether the provided parameter is a JavaScript Boolean or not.
*/
export function isBoolean(obj: any): obj is boolean {
return obj === true || obj === false;
}
/**
* @returns whether the provided parameter is undefined.
*/
export function isUndefined(obj: any): boolean {
return typeof obj === _typeof.undefined;
}
/**
* @returns whether the provided parameter is undefined or null.
*/
export function isUndefinedOrNull(obj: any): boolean {
return isUndefined(obj) || obj === null;
}
const hasOwnProperty = Object.prototype.hasOwnProperty;
/**
* @returns whether the provided parameter is an empty JavaScript Object or not.
*/
export function isEmptyObject(obj: any): obj is any {
if (!isObject(obj)) {
return false;
}
for (let key in obj) {
if (hasOwnProperty.call(obj, key)) {
return false;
}
}
return true;
}
/**
* @returns whether the provided parameter is a JavaScript Function or not.
*/
export function isFunction(obj: any): obj is Function {
return typeof obj === _typeof.function;
}
/**
* @returns whether the provided parameters is are JavaScript Function or not.
*/
export function areFunctions(...objects: any[]): boolean {
return objects && objects.length > 0 && objects.every(isFunction);
}