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    @jsweb/truetype

    4.0.3 • Public • Published

    @jsweb/truetype

    Simple JS module to check types more consistently.

    Check types in JavaScript is not so easy...

    The builtin operators typeof, instanceof and other methods are not precise enough to report the exact type of a value.

    So, this module aims to check types of variables with more useful returns.

    See tests at https://truetype.jsweb.app

    npm-package es6-module tests-mocha

    New in v4.0.0

    Now, its a full ES module, there is no UMD or CommonJS version.

    In modern JS development ES modules are the pattern, already supported in newer versions of Node.js and modern borwsers natively.

    Backward compatibility is not a concern here. If you use a module bundler (like Webpack or Rollup) to transpile your code, the result will be compatible according to your setup.


    Installation

    You can install with NPM, Yarn or Unpkg CDN:

    npm i -S @jsweb/truetype

    yarn add @jsweb/truetype

    Usage

    ES6

    Tree shaking (since v3.0.0):

    import { isInteger, isDate, isNotNull } from '@jsweb/truetype'

    From CDN (installation not required)

    <script type="module">
      import { isNumber } from 'https://unpkg.com/@jsweb/truetype'
    
      const number = isNumber(1)
    </script>

    Methods

    isDefined(value: any): boolean

    Check if a value is not undefined.

    isNull(value: any): boolean

    Check if value is null.

    isNotNull(value: any): boolean

    Check if value is not null.

    isValid(value: any): boolean

    Check if value is "valid" (is not null or undefined).

    instance(value: any): string

    Get the constructor name of the value.

    Returns a string with a type name like Object, Array, String, Number, ...

    Can be a native or custom constructor name.

    instance(1) // returns Number
    
    class Foo {
      constructor(x) {
        this.x = x
      }
    }
    
    const bar = new Foo(1)
    
    instance(bar) // returns Foo

    is(value: any, type: string): boolean

    Check if value is of type.

    Can be a native or custom constructor name.

    is({}, 'Object') // returns true
    is([], 'Array') // returns true
    is('foo', 'String') // returns true
    is(false, 'Boolean') // returns true
    // ...
    
    class Foo {
      constructor(x) {
        this.x = x
      }
    }
    
    const bar = new Foo(1)
    
    is(bar, 'Foo') // returns true

    isBoolean(value: any): boolean

    Check if value is a boolean.

    isString(value: any): boolean

    Check if value is a string.

    isNumber(value: any): boolean

    Check if value is a number.

    isInteger(value: any): boolean

    Check if value is an integer number.

    isFloat(value: any): boolean

    Check if value is a float point number.

    isObject(value: any): boolean

    Check if value is an object.

    isArray(value: any): boolean

    Check if value is an Array.

    isDate(value: any): boolean

    Check if value is a Date object.

    isRegExp(value: any): boolean

    Check if value is a Regular Expression.

    isFunction(value: any): boolean

    Check if value is a function.

    isEmpty(value: string | array | object): boolean

    This is a bonus utility.

    Check if value is empty.

    Only for string, array and objects. Any other type will return false.

    Install

    npm i @jsweb/truetype

    DownloadsWeekly Downloads

    6

    Version

    4.0.3

    License

    MIT

    Unpacked Size

    9.14 kB

    Total Files

    4

    Last publish

    Collaborators

    • alexbruno