BellaJS

Lightweight util for handling data type, string... in your Node.js and browser apps.

Contents

• Setup

• APIs

  • DataType detection
  • String manipulation
  • Data handling: clone, copies
  • Array utils: pick, sort, sortBy, shuffle, unique
  • Functional utils: curry, compose, pipe, maybe
  • Date utils: formatDateString, formatTimeAgo
  • Random utils: randint, genid

• Test

• License

Install & Usage

Node.js

npm i bellajs

# pnpm
pnpm i bellajs

# yarn
yarn add bellajs

Deno

import { genid } from 'https://esm.sh/bellajs'

console.log(genid())

Browser

APIs

DataType detection

• .isArray(Anything val)
• .isBoolean(Anything val)
• .isDate(Anything val)
• .isElement(Anything val)
• .isEmail(Anything val)
• .isEmpty(Anything val)
• .isFunction(Anything val)
• .isInteger(Anything val)
• .isLetter(Anything val)
• .isNil(Anything val)
• .isNull(Anything val)
• .isNumber(Anything val)
• .isObject(Anything val)
• .isString(Anything val)
• .isUndefined(Anything val)

String manipulation

• .ucfirst(String s)
• .ucwords(String s)
• .escapeHTML(String s)
• .unescapeHTML(String s)
• .slugify(String s)
• .stripTags(String s)
• .stripAccent(String s)
• .truncate(String s, Number limit)
• .replaceAll(String s, String|Array search, String|Array replace)

Data handling

clone(Anything val)

Make a deep copy of a variable.

import { clone } from 'bellajs'

const b = [
  1, 5, 0, 'a', -10, '-10', '',
  {
    a: 1,
    b: 'Awesome'
  }
]

const cb = clone(b)
console.log(cb)

cb now has the same values as b, while the properties are standalone, not reference. So that:

cb[7].a = 2
cb[7].b = 'Noop'

console.log(b[7])

What you get is still:

{
  a: 1,
  b: 'Awesome'
}

copies(Object source, Object target[[, Boolean requireMatching], Array excepts])

Copy the properties from source to target.

• requireMatching: if true, BellaJS only copies the properties that are already exist in target.
• excepts: array of the properties properties in source that you don't want to copy.

After this action, target will be modified.

import { copies } from 'bellajs'

const a = {
  name: 'Toto',
  age: 30,
  level: 8,
  nationality: {
    name: 'America'
  }
}
const b = {
  level: 4,
  IQ: 140,
  epouse: {
    name: 'Alice',
    age: 27
  },
  nationality: {
    long: '18123.123123.12312',
    lat: '98984771.134231.1234'
  }
}

copies(a, b)
console.log(b)

Output:

{
  level: 8,
  IQ: 140,
  epouse: {
    name: 'Alice',
    age: 27
  },
  nationality: {
    long: '18123.123123.12312',
    lat: '98984771.134231.1234',
    name: 'America'
  },
  name: 'Toto',
  age: 30
}

Array utils

pick(Array arr [, Number count = 1])

Randomly choose N elements from array.

import { pick } from 'bellajs'

const arr = [1, 3, 8, 2, 5, 7]
pick(arr, 2) // --> [3, 5]
pick(arr, 2) // --> [8, 1]
pick(arr) // --> [3]
pick(arr) // --> [7]

sort(Array arr [, Function compare])

Sort the array using a function.

import { sort } from 'bellajs'

const fn = (a, b) => {
  return a < b ? 1 : a > b ? -1 : 0
}

sort([3, 1, 5, 2], fn) // => [ 1, 2, 3, 5 ]

sortBy(Array arr, Number order, String property)

Sort the array by specific property and direction.

import { sortBy } from 'bellajs'

const players = [
  {
    name: 'Jerome Nash',
    age: 24
  },
  {
    name: 'Jackson Valdez',
    age: 21
  },
  {
    name: 'Benjamin Cole',
    age: 23
  },
  {
    name: 'Manuel Delgado',
    age: 33
  },
  {
    name: 'Caleb McKinney',
    age: 28
  }
]

const result = sortBy(players, -1, 'age')
console.log(result)

shuffle(Array arr)

Shuffle the positions of elements in an array.

import { shuffle } from 'bellajs'

shuffle([1, 3, 8, 2, 5, 7])

unique(Array arr)

Remove all duplicate elements from an array.

import { unique } from 'bellajs'

unique([1, 2, 3, 2, 3, 1, 5]) // => [ 1, 2, 3, 5 ]

Functional utils

curry(fn)

Make a curried function.

import { curry } from 'bellajs'

const sum = curry((a, b, c) => {
  return a + b + c
})

sum(3)(2)(1) // => 6
sum(1)(2)(3) // => 6
sum(1, 2)(3) // => 6
sum(1)(2, 3) // => 6
sum(1, 2, 3) // => 6

compose(f1, f2, ...fN)

Performs right-to-left function composition.

import { compose } from 'bellajs'

const f1 = (name) => {
  return `f1 ${name}`
}
const f2 = (name) => {
  return `f2 ${name}`
}
const f3 = (name) => {
  return `f3 ${name}`
}

const addF = compose(f1, f2, f3)

addF('Hello') // => 'f1 f2 f3 Hello'

const add1 = (num) => {
  return num + 1
}

const mult2 = (num) => {
  return num * 2
}

const add1AndMult2 = compose(add1, mult2)
add1AndMult2(3) // => 7
// because multiple to 2 first, then add 1 late => 3 * 2 + 1

pipe(f1, f2, ...fN)

Performs left-to-right function composition.

import { pipe } from 'bellajs'

const f1 = (name) => {
  return `f1 ${name}`
}
const f2 = (name) => {
  return `f2 ${name}`
}
const f3 = (name) => {
  return `f3 ${name}`
}

const addF = pipe(f1, f2, f3)

addF('Hello') // => 'f3 f2 f1 Hello'

const add1 = (num) => {
  return num + 1
}

const mult2 = (num) => {
  return num * 2
}

const add1AndMult2 = pipe(add1, mult2)
add1AndMult2(3) // => 8
// because add 1 first, then multiple to 2 late => (3 + 1) * 2

maybe(Anything val)

Return a static variant of Maybe monad.

import { maybe } from 'bellajs'

const plus5 = x => x + 5
const minus2 = x => x - 2
const isNumber = x => Number(x) === x
const toString = x => 'The value is ' + String(x)
const getDefault = () => 'This is default value'

maybe(5)
  .map(plus5)
  .map(minus2)
  .value() // 8

maybe('noop')
  .map(plus5)
  .map(minus2)
  .value() // null

maybe(5)
  .if(isNumber)
  .map(plus5)
  .map(minus2)
  .else(getDefault)
  .map(toString)
  .value() // 'The value is 8'

maybe()
  .if(isNumber)
  .map(plus5)
  .map(minus2)
  .map(toString)
  .value() // null

maybe()
  .if(isNumber)
  .map(plus5)
  .map(minus2)
  .else(getDefault)
  .map(toString)
  .value() // 'This is default value'

Date utils

formatDateString(Date | Timestamp [, String locale [, Object options]])

import {
  formatDateString
} from 'bellajs'

const today = new Date()

formatDateString(today) // => Jan 3, 2022, 8:34:28 PM GMT+7

// custom format
formatDateString(today, {
  dateStyle: 'short',
  timeStyle: 'short',
  hour12: true
}) // => 1/3/22, 8:34 PM

// custom locale
formatDateString(today, 'zh') // => 2022年1月3日 GMT+7 下午8:34:28

// custom lang and format
formatDateString(today, 'zh', {
  dateStyle: 'short',
  timeStyle: 'long',
  hour12: true
}) // => 2022/1/3 GMT+7 下午8:34:28

formatDateString(today, 'vi') // => 20:34:28 GMT+7, 3 thg 1, 2022
formatDateString(today, 'vi', {
  dateStyle: 'full',
  timeStyle: 'full'
}) // => 20:34:28 Giờ Đông Dương Thứ Hai, 3 tháng 1, 2022

formatTimeAgo(Date | Timestamp [, String locale [, String justnow]])

import {
  formatTimeAgo
} from 'bellajs'

const today = new Date()

const yesterday = today.setDate(today.getDate() - 1)
formatTimeAgo(yesterday) // => 1 day ago

const current = new Date()
const aLittleWhile = current.setHours(current.getHours() - 3)
formatTimeAgo(aLittleWhile) // => 3 hours ago

// change locale
formatTimeAgo(aLittleWhile, 'zh') // => 3小时前
formatTimeAgo(aLittleWhile, 'vi') // => 3 giờ trước

The last param justnow can be used to display a custom 'just now' message, when the distance is lesser than 1s.

const now = new Date()
const aJiff = now.setTime(now.getTime() - 100)
formatTimeAgo(aJiff) // => 'just now'
formatTimeAgo(aJiff, 'fr', 'à l\'instant') // => à l'instant
formatTimeAgo(aJiff, 'ja', 'すこし前') // => すこし前

These two functions based on recent features of built-in object Intl.

Please refer the following resources for more info:

• Intl.DateTimeFormat() constructor
• Intl.RelativeTimeFormat
• Intl.Locale

Random utils

randint([Number min [, Number max]])

Returns a number between min and max

import { randint } from 'bellajs'

randint() // => a random integer
randint(1, 5) // => a random integer between 3 and 5, including 1 and 5

genid([Number length [, String prefix]])

Create random ID string.

import { genid } from 'bellajs'

genid() // => random 32 chars
genid(16) // => random 16 chars
genid(5) // => random 5 chars
genid(5, 'X_') // => X_{random 3 chars}

Test

git clone https://github.com/ndaidong/bellajs.git
cd bellajs
npm install
npm test

License

The MIT License (MIT)