JavaScript utility library for web and nodejs development
npm install @andrewcaires/utils.js
JavaScript utility library for web and nodejs development
npm i @andrewcaires/utils.js
Class for custom events
``js
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
`js
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
`js
const cb = (data) => {
console.log(data);
}
emitter.once('event', cb);
`
- EventEmitter.off Removes the specified listener from the listener array for the event named
`js`
emitter.off('event', cb);
- EventEmitter.emit Synchronously calls each of the listeners registered for the event named
`js`
emitter.emit('event', 'on emit event');
Determine the internal JavaScript [[Class]] of an object
`js`
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
`js`
isArray([]) // > true
- isBoolean Finds out whether a variable is a boolean
`js`
isBoolean(true) // > true
isBoolean(false) // > true
- isDef Find out if a variable has been defined
`js`
isDef(any) // > true
- isFunction Find whether the type of a variable is function
`js`
isFunction(function() {}) // > true
- isNumber Finds whether a variable is an number
`js`
isNumber(1) // > true
isNumber(1.7) // > true
- isObject Finds whether a variable is an object
`js`
isObject({}) // > true
- isString Find whether the type of a variable is string
`js`
isString('') // > true
- isFloat Finds whether the type of a variable is float
`js`
isFloat(1.7) // > true
- isInteger Find whether the type of a variable is integer
`js`
isInteger(1) // > true
- isNull Finds whether a variable is null
`js`
isNull(null) // > true
- isUndefined Finds whether a variable is undefined
`js`
isUndefined(undefined) // > true
- type Get the type of a variable
`js
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'
``
* MIT