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@dwtechs/checkard

v2.26.0

Published

An open source dynamic type checking library for Javascript, Typescript and Node.js to test if a given variable is what it is supposed to be.

Downloads

360

Readme

License: MIT npm version last version release date Jest:coverage minified size

Synopsis

Checkard.js is an open source dynamic type checking library for Javascript, Typescript and Node.js to test if a given variable is what it is supposed to be ( Function, object, ascii, boolean, integer, string, json, email...)

  • No dependency
  • Very lightweight
  • Thoroughly tested
  • Works in browsers and Node.js
  • Works in Javascript and Typescript
  • Old browsers support

Browsers

  • android: 2.2,
  • chrome: 34,
  • edge: 12,
  • firefox: 11,
  • ie: 9,
  • ios: 4.2,
  • opera: 28,
  • safari: 5.1,
  • samsung: 4

Those are the oldest targeted versions. The library should work properly on older devices but we do not support it officially.

Installation

$ npm i @dwtechs/checkard

Usage

ES6 / TypeScript

import { isFunction, isArray } from "@dwtechs/checkard";

if (isFunction(variable)) {
  //variable is a function
}

if (!isArray(variable, '=', 2)) {
  //variable is not an array of length 2
}

CommonJS

const ch = require("@dwtechs/checkard/dist/ch");

if (ch.isFunction(variable)) {
  //variable is a function
}

if (!ch.isArray(variable, '=', 2)) {
  //variable is not an array of length 2
}

IIFE

<script src="node_modules/@dwtechs/checkard/dist/ch.iife.min.js"></script>
if (ch.isFunction(variable)) {
  //variable is a function
}

if (!ch.isArray(variable, '=', 2)) {
  //variable is not an array of length 2
}

API Reference

Types


Comparator = '='|'<'|'>'|'<='|'>=';

Primitive


isBoolean(bool: any): boolean {}

isString(string: any, emptyCheck?: boolean = false): boolean {}

// If typeCheck = false values like '4', '0', '8e4', '+true', '0x44' return true
isNumber(number: any, typeCheck?: boolean = true): boolean {}

isSymbol(sym: any): boolean {}

Structural


isFunction(func: any): boolean {}

isObject(obj: any, emptyCheck?: boolean = false): boolean {}

//Check whether val is null or undefined
isNil(val: any): boolean {}

Number


isInteger(number: any, typeCheck?: boolean = true): boolean {}

isFloat(number: any, typeCheck?: boolean = true): boolean {}

isEven(number: any, typeCheck?: boolean = true): boolean {}

isOdd(number: any, typeCheck?: boolean = true): boolean {}

isOrigin(number: any, typeCheck?: boolean = true): boolean {}

isPositive(number: any, typeCheck?: boolean = true): boolean {}

isNegative(number: any, typeCheck?: boolean = true): boolean {}

isPowerOfTwo(number: any, typeCheck?: boolean = true): boolean {}

isAscii(code: any, extended?: boolean = false): boolean {}

Valid number


isValidNumber(number: any, 
              min?: number = -999999999, 
              max?: number = 999999999, 
              typeCheck?: boolean = true ): boolean {}

isValidInteger(number: any, 
               min?: number = -999999999, 
               max?: number = 999999999, 
               typeCheck?: boolean = true ): boolean {}

isValidFloat( number: any, 
              min?: number = -999999999.9, 
              max?: number = 999999999.9, 
              typeCheck?: boolean = true ): boolean {}

String


isStringOfLength( string: any, 
                  min?: number = 0, 
                  max?: number = 999999999 ): boolean {}

isJson(string: any): boolean {}

isRegex(regex: any, typeCheck?: boolean = true): boolean {}

isEmail(email: any): boolean {}

isIpAddress(ipAddress: any): boolean {}

isJWT(t: any): boolean {}

isSlug(slug: any): boolean {}

isHexadecimal(string: any): boolean {}

containsUpperCase(string: any): boolean {}

containsLowerCase(string: any): boolean {}

containsSpecialCharacter(string: any): boolean {}

containsNumber(string: any, min?: number|null, max?: number|null): boolean {}

Date


isDate(date: any): boolean {}

isValidDate(date: any, min?: Date = new Date('1/1/1900'), max?: Date = new Date('1/1/2200')): boolean {}

isTimestamp(number: any, typeCheck?: boolean = true): boolean {}

// default min = 1/1/1900 (month/day/year)
// default max = 1/1/2200 (month/day/year)
isValidTimestamp(number: any, min?: number = -2208989361000, max?: number = 7258114800000, typeCheck?: boolean = true): boolea {}

Array


// Check if 'array' is an array and optionally if it is of length =, <, >, <= or >= than 'length'
isArray(array: any, comparator?: Comparator|null, length?: number|null): boolean {}

example :


let ar = ['dog','cat','bird'];

if (isArray(array)) {
  // check if ar is an array
}

if (isArray(array, '=', 2)) {
  // check if ar is an array of length 2
}

if (isArray(array, '>=', 1)) {
  // check if ar is an array of length greater than or equal to 1
}

Html


isHtmlElement(htmlElement: any): boolean {}

isHtmlEventAttribute(htmlEventAttribute: any): boolean {}

isNode(node: any): boolean {}

Normalize


ucfirst(string: string, everyWords?: boolean = true): string | false {}

normalizeNickname(nickname: string, firstName: string, lastName: string): string | false {}

normalizeName(string: string): string | false {}

normalizeEmail(string: string): string | false {}

example :


function normalizeInputs(req, res, next) {
  const users = req.body.rows;
  log.debug(`Normalize values for ${users.length} users`);

  for (const u of users) {
    const { firstName, lastName, nickname, email } = u;
    u.firstname = str.normalizeName(firstName);
    u.lastname = str.normalizeName(lastName);
    u.nickname = str.normalizeNickname(nickname, firstName, lastName);
    u.email = str.normalizeName(email);
  }
  next();
}

Contributors

Checkard.js is still in development and we would be glad to get all the help you can provide. To contribute please read contributor.md for detailed installation guide.

Stack

| Purpose | Choice | Motivation | | :-------------- | :------------------------------------------: | -------------------------------------------------------------: | | repository | Github | hosting for software development version control using Git | | package manager | npm | default node.js package manager | | language | TypeScript | static type checking along with the latest ECMAScript features | | module bundler | Rollup.js | advanced module bundler for ES6 modules | | unit testing | Jest | delightful testing with a focus on simplicity |