QoLib for JavaScript

A small JavaScript library that enhances Quality of Life by solving various problems.

TypeChecker

A set of methods for checking data types in JavaScript.

import { isNumber } from 'qolib'

isNumber(10)   // true
isNumber('10') // true
isNumber([10]) // false
isNumber(null) // false
isNumber('')   // false

List of checkers


isNull	Checks if the value is null
isUndefined	Checks if the value is undefined
isNone	Checks if the value is null or undefined
isBool	Checks if the value is a boolean
isObject	Checks if the value is an object
isArray	Checks if the value is an array
isString	Checks if the value is a string
isEmptyString	Checks if the string is empty
isWhiteSpaceString	Checks if the string is empty or consists only of whitespace
isNumber	Checks if the value is a number or a string containing a number
isFunction	Checks if the value is a function
isIterable	Checks if the value is iterable

DateTime

Gets a string representation of the date and time in the specified format.

import { dateTime } from 'qolib'

// Current date and time in the format 'YYYY-MM-DD HH:mm:ss'
dateTime()

// Current date in the format 'DD-MM-YYYY'
dateTime('%d-%m-%Y')

// Custom date in the format 'YYYY-MM-DD HH:mm:ss'
dateTime(customDateObject)

// Custom date in the format 'DD-MM-YYYY'
dateTime(customDateObject, '%d-%m-%Y')

Random

Generates a random integer between minimum and maximum values.

import { random } from 'qolib'

random(0, 4) // random int between 0-4 inclusive

RangeNumber

Creates a range of numbers with the specified step (default is 1). The function uses lazy evaluation, which allows to create a conditionally infinite range.

import { range } from 'qolib'

for (const number in range(0, 5)) {
  console.log(number) // 0, 1, 2, 3, 4, 5
}

console.log(...range(-5, 5, 2)) // -5, -3, -1, 1, 3, 5

Installation

npm i qolib