@andrewcaires/utils.js NPM

utils.js

JavaScript utility library for web and nodejs development

Installation

npm i @andrewcaires/utils.js

Api

EventEmitter

Class for custom events

import { EventEmitter } from '@andrewcaires/utils.js';

const emitter = new EventEmitter();

// OR

class CustomEvent extends EventEmitter {}

const custom = new CustomEvent();

EventEmitter.on Adds the listener function to the end of the listeners array for the event named

const cb = (data) => {

  console.log(data);
}

emitter.on('event', cb);

EventEmitter.once Adds the listener function to the end of the listeners array for the event named. The next time event is triggered, this listener is removed

const cb = (data) => {

  console.log(data);
}

emitter.once('event', cb);

EventEmitter.off Removes the specified listener from the listener array for the event named

emitter.off('event', cb);

EventEmitter.emit Synchronously calls each of the listeners registered for the event named

emitter.emit('event', 'on emit event');

type

Determine the internal JavaScript [Class] of an object

import { isArray, isBoolean, isFunction, isNumber, isObject, isString, isFloat, isInteger, isNull, isUndefined, isValid, type } from '@andrewcaires/utils.js';

isArray Finds whether a variable is an array

isArray([]) // > true

isBoolean Finds out whether a variable is a boolean

isBoolean(true) // > true
isBoolean(false) // > true

isDef Find out if a variable has been defined

isDef(any) // > true

isFunction Find whether the type of a variable is function

isFunction(function() {}) // > true

isNumber Finds whether a variable is an number

isNumber(1) // > true
isNumber(1.7) // > true

isObject Finds whether a variable is an object

isObject({}) // > true

isString Find whether the type of a variable is string

isString('') // > true

isFloat Finds whether the type of a variable is float

isFloat(1.7) // > true

isInteger Find whether the type of a variable is integer

isInteger(1) // > true

isNull Finds whether a variable is null

isNull(null) // > true

isUndefined Finds whether a variable is undefined

isUndefined(undefined) // > true

type Get the type of a variable

type([]); // => 'array'

type(true); // => 'boolean'
type(false); // => 'boolean'

type(function() {}); // => 'function'

type(1); // => 'number'
type(1.7); // => 'number'

type({}); // => 'object'

type(''); // => 'string'
type('test'); // => 'string'

type(); // => 'null'
type(null); // => 'null'