@flk/supportive-is NPM

Supportive Is

This is a very lightweight library to validate different things

Supportive Is
Table of contents
Install
Importing
Dependencies
Usage

Install

npm install flk-supportive-is

Importing

Node JS

const {Is} = require('flk-supportive-is');

using import syntax

import Is from 'flk-supportive-is';

Browser

<script src="dist/is.min.js"></script>

Dependencies

No dependencies required to use this library

Usage

Is.null

Check if the given value is null

let name = null;
console.log(Is.null(name)); // true

name = undefined;
console.log(Is.null(name)); // false

Is.undefined

Check if the given value is undefined

let name = 'Hasan';
console.log(Is.undefined(name)); // false

let myVar; // any declared variable without a value will be treated as undefined
console.log(Is.undefined(myVar)); // true

let age = undefined;
console.log(Is.undefined(age)); // true

Is.numeric

Check if the given value is a number whatever if its data type is String or Number

let numberInt = 12;
console.log(Is.numeric(numberInt)); // true

let numberFloat = 12.55;
console.log(Is.numeric(numberFloat)); // true

let numberWrittenInString = '99';
console.log(Is.numeric(numberWrittenInString)); // true

let floatWrittenInString = '99.99';
console.log(Is.numeric(floatWrittenInString)); // true

Is.int

Check if the given value is an integer and its data type is number

let number = 12;
console.log(Is.int(numberInt)); // true

let numberInString = '12';
console.log(Is.int(numberInString)); // false

Is.float

Check if the given value is a float number and its data type is number

let number = 921;
console.log(Is.float(number)); // false

number = 82.42;
console.log(Is.float(number)); // true

let numberInString = '12.5';
console.log(Is.float(numberInString)); // false

Is.NaN

Check if the given value is Not a Number This method works exactly same as isNaN as it is already implementing it xD.

let number = 76; // number int
console.log(Is.NaN(number)); // false

number = '76'; // string
console.log(Is.NaN(number)); // true

Is.regex

Check if the given value is a regex expression.

let regex = /[a-z]+/; 
console.log(Is.regex(regex)); // true

let string = '/[a-z]+/'; 
console.log(Is.regex(string)); // false

Is.array

Check if the given value is an array

let myArray = [4 , 'hello', 9];
console.log(Is.array(myArray)); // true

Is.object

Check if the given value is an object

Any type of objects will be validated true no matter its object type

Arrays are types of objects so any passed array will be validated as true

let myObject = {};
console.log(Is.object(myObject)); // true

class myClass {}
let anotherObject = new myClass;
console.log(Is.object(myObject)); // true

let myArray = [];
console.log(Is.object(myArray)); // true

// to check if the given value is an object but not an array
//you must mix between Is.object AND Is.array to avoid an array
if (Is.object(myVar) && ! Is.array(myVar)) {
    // do something with that object
}

Is.plainObject

Check if the given value is a plain object

Any type of objects will be validated as false unless it's a {} plain object.

let myObject = {};
console.log(Is.plainObject(myObject)); // true

class myClass {}
let anotherObject = new myClass;
console.log(Is.plainObject(myObject)); // false

let myArray = [];
console.log(Is.plainObject(myArray)); // false

Is.validHtmlId

Check if the given value is a valid html id attribute

let id = 'my-id';
console.log(Is.validHtmlId(id)); // true

let invalidId = 'my,id';

console.log(Is.validHtmlId(invalidId)); //false

Is.jquery

Check if the given value is a jquery object

let body = $('body');
console.log(Is.jquery(body)); // true

Is.dom

Check if the given value is a dom element

Dom Elements are objects of HTMLElement, so any html element will be validated as true, something like document.body
document and window are not validated as true as they are not part of the html elements

console.log(Is.dom(document)); // false

console.log(Is.dom(document.document)); // true

let myForm = document.getElementById('my-form');

console.log(Is.dom(document.body)); // true

Is.formElement

Check if the given value is an instance of HTMLFormElement.

let myForm = document.getElementById('my-form');

console.log(Is.formElement(myForm)); // true

console.log(Is.formElement(document.body)); // false

Is.formData

Check if the given value is an instance of FormData.

let myForm = document.getElementById('my-form');

let formDataForm = new FormData(myForm);

console.log(Is.formData(myForm)); // false

console.log(Is.formData(formDataForm)); // true

Is.a

Check if the given object value is an object of the given class name

class MyClass {}

let myObject = new MyClass;

console.log(Is.a(moyObject, 'MyClass')); // true

Is.iterable

Check if the given object is iterable

console.log(Is.iterable([])); // true

console.log(Is.iterable({})); // false

console.log(Is.iterable(new Map)); // true

console.log(Is.iterable(new Set)); // true

Is.symbol

Check if the given value is a Symbol

console.log(Is.symbol(Symbol())); // true

console.log(Is.symbol(Symbol('foo'))); // true

Is.string

Check if the given value is string

console.log(Is.string('this is a string')); // true

Is.bool

Is.bool has an alias method Is.boolean

Check if the given value is a boolean value.

console.log(Is.bool(true)); // true

console.log(Is.bool(false)); // true

Is.function

Check if the given value is a function

function sum(x, y) {
    return x + y;
}

// you must pass the function name not the function call
console.log(Is.function(sum)); // true

// if you passed the function call it will be not a function in this situation
console.log(Is.function(sum(2, 3))); // false

Is.callable

Check if the given value is a callable value

function sum(x, y) {
    return x + y;
}

console.log(Is.callable(sum)); // true


let callback = function () {
    return 'hello';
}

console.log(Is.callable(callback)); // true

console.log(Is.callable(callback())); // false

Is.native

Check if the given value is a native function

let isArray = Array.isArray;

console.log(Is.native(isArray)); // true

console.log(Is.native(Math.min)); // true

Math.sum = function (num1, num2) {
    return num1 + num2;
};


console.log(Is.native(Math.sum)); // false

Is.scalar

Check if the given value is a string, number or boolean

console.log(Is.scalar('hello')); // true

console.log(Is.scalar(22.5)); // true

console.log(Is.scalar(false)); // true

console.log(Is.scalar(null)); // false

console.log(Is.scalar(undefined)); // false

console.log(Is.scalar([])); // false

console.log(Is.scalar({})); // false

Is.empty

Check if the given value is empty

This is a kind of smart method that will validate the given value whether it is empty or not based on its type

// undefined values are considered empty
let value = undefined;
console.log(Is.empty(value)); // true

// null values are considered empty
value = null;
console.log(Is.empty(value)); // true

// Also any objects with no values are considered empty
value = {};
console.log(Is.empty(value)); // true

value.name = 'Hasan';
console.log(Is.empty(value)); // false

// Arrays
value = [];
console.log(Is.empty(value)); // true

value.push(12);
console.log(Is.empty(value)); // false

// The `Zero` is not considered as empty value
value = 0;
console.log(Is.empty(value)); // false

Is.json

Check if the given value string is a valid json format

let value = '{"name":"Hasan","job":"Full Stack Developer"}';
console.log(Is.json(value)); // true

Is.url

Check if the given value is a valid url

let url = 'google.com';
console.log(Is.url(url)); // true

url = 'https://google.com';
console.log(Is.url(url)); // true

url = 'www.google.com';
console.log(Is.url(url)); // true

url = 'www.google.com?q=hello+world';
console.log(Is.url(url)); // true

let url = 'google';
console.log(Is.url(url)); // false

Is.email

Check if the given value string is a valid email

let myEmail = 'hassanzohdy@gmail.com';
console.log(Is.email(myEmail)); // true

Is.cookieEnabled

Check if cookies are enabled in the browser

if (! Is.cookeEnabled()) {
    // Oops!, cookies are not enabled!
}

Is.mobile.*

Check if current visitor is browsing from a sort-of mobile

this property contains set of methods

// To check if user is browsing from an android device
if (Is.mobile.andriod()) {
    // do something
}

// To check if  user is browsing from a blackBerry mobile
if (Is.mobile.blackBerry()) {
    // do something
}

// To check if  user is browsing from an ios device
if (Is.mobile.ios()) {
    // do something
}

// To check if  user is browsing from an ios device
if (Is.mobile.ios()) {
    // do something
}

// To check if  user is browsing from an iphone
if (Is.mobile.iphone()) {
    // do something
}

// To check if  user is browsing from an ipad
if (Is.mobile.ipad()) {
    // do something
}

// To check if  user is browsing from an ipod
if (Is.mobile.ipod()) {
    // do something
}

// To check if  user is browsing from a windows mobile
if (Is.mobile.windows()) {
    // do something
}

// To check if user is browsing from any type of mobile
if (Is.mobile.any()) {
    // do something
}

Is.desktop

Check if current visitor is browsing from a desktop device

Please note that any non mobile type will be considered as desktop.

if (! Is.cookeEnabled()) {
    // Oops!, cookies are not enabled!
}

Is.browser

Check if the current browser matches the given name

if (Is.browser('chrome')) {
    // do something
} else if (Is.browser('firefox')) {
    // do something
} else if (Is.browser('opera')) {
    // do something
} else if (Is.browser('safari')) {
    // do something
} else if (Is.browser('ie')) {
    // do something
} else if (Is.browser('edge')) {
    // do something
}

Is.mobileNumber

Works only with Egypt mobile numbers, feel free to PR your country mobile number validation.

.eg

Validate mobile number for the following syntaxes:

01[0|1|2|5]-8(digits)
+201[0|1|2|5]-8(digits)
201[0|1|2|5]-8(digits)

let withCode = true; // to bypass mobile numbers starting with country code

console.log(Is.mobileNumber.eg('01002223344')); // true

console.log(Is.mobileNumber.eg('+201002223344', withCode)); // true

console.log(Is.mobileNumber.eg('201002223344', withCode)); // true

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1.3.0

4 years ago

0.2.3

5 years ago