@rah-emil/js-helpers

jsHelpers 🚀

jsHelpers - it is a JavaScript library that contains all the functions that we constantly write or google.

Let's use the jsHelpers library to google less and implement more of the project's functionality.

Below are examples and descriptions of all the functions available in jsHelpers.

Getting started

ES6

npm i @rah-emil/js-helpers --save

import "@rah-emil/js-helpers"

or

import { simplifyNumber } from "@rah-emil/js-helpers/src/modules/visual"

Number.prototype.simplifyNumber = simplifyNumber

(3568934).simplifyNumber(2) // 3.57M

CDN

<script src="https://cdn.jsdelivr.net/npm/@rah-emil/js-helpers@1.1.0/dist/js-helpers.js"></script>

<script>
    (3568934).simplifyNumber(2) // 3.57M
</script>

Math functions

These are functions that perform some kind of mathematical operations on numbers and return the result to us.

Percentage difference between numbers

For example, we need to find out - how much more we earned this month, compared to the last month (in percent).

// 500 - earned this month
// 1500 - earned last month

(500).percentageDifference(1500) // -66.66666666666666 (earned 66.6% less)

Subtracting a specific percentage from a number

For example, we want to display the cost of a discounted product

// 500 - number to subtract
// 25 - percent

(500).minusPercentage(25) // 375

Random number FROM and TO

Math.randomInteger(10, 90) // random number from 10 to 90

Integer check

(14.7).isInteger() // false

The nearest distance

For example, to find the closest city to a user

let locations = [
    {name: "Moscow", coords: [55.79749504565197, 37.5407153847656]},
    {name: "Voronezh", coords: [51.66109513550912, 39.19964245473753]},
    {name: "Yaroslavl", coords: [57.62662119485742, 39.89367465100093]},
    {name: "Rybinsk", coords: [58.04855727216249, 38.85813673976128]},
    {name: "Ivanovo", coords: [57.00040249293972, 40.973840485275254]},
    {name: "Kursk", coords: [51.73096145146215, 36.192820361190755]},
    {name: "Bryansk", coords: [53.243644660620774, 34.36328412094874]},
]

let myCoords = [52.7614485, 35.6722916]

Math.nearestDistance(locations, myCoords)

// {
//     "name": "Bryansk",
//     "coords": [
//         53.243644660620774,
//         34.36328412094874
//     ]
// }

Converting numbers to a specific format

Very often we need to convert a number, for example, to a monetary format, or just break it down into digits. More on this below.

Monetary number format

Convert numbers to desired currency format

A simple example:

(14990.79).toCurrency() // 14 990.79$ (non-breaking spaces)

We can specify price parameters:

// 1st parameter - currency symbol or text (by default "$")
// 2nd parameter - currency position ('after' - by default after, 'before' - in front)
// 3rd parameter - number of decimal places (default 2)
// 4th parameter - whether to trim zeros after the decimal point (by default false, i.e. no zeros)
// 5th parameter - separator (by default ".")

(14990.79).toCurrency("₽", undefined, 2, true, ",") // 14 990,79₽

Dividing a number into digits

(3568934).makeDigit() // 3 568 934 (non-breaking spaces)

Simplifying large numbers (for humans)

For example, we need to display the number of views of an article, likes, comments, etc.

(7356892344).simplifyNumber(1) // 7.4B
(3568934).simplifyNumber(2) // 3.57M
(58934).simplifyNumber(2) // 58.93K
(5894).simplifyNumber(1) // 5.9K
(168).simplifyNumber() // 168

Array Actions

Simple array operations

Removing items

Removing 1 item

let numbers = [854, 1, 8, 4, 7, 4354]
numbers.deleteItem(4) // [854, 1, 8, 7, 4354]

Removing multiple items

let numbers = [854, 1, 8, 4, 7, 4354]
numbers.deleteItems([4, 854]) // [1, 8, 7, 4354]

Actions on objects in an array

Sum of Object Keys

For example, we need to calculate the total cost of all items in the cart.

let cart = [
   {title: 'iPhone 6s', price: 23500.00},
   {title: 'AirPods', price: 11390.00},
   {title: 'Чехол для iPhone 6s (синий)', price: 490.80},
]

cart.sum('price') // 35380.8 (number)
cart.sum('price').toCurrency("₽") // 35 380.80₽ (monetary number)

Average of object keys

For example, we need to find out the average rating of a product according to reviews.

let product = {
   title: 'iPhone XR',
   // ...
   reviews: [
       {text: '...', stars: 4.9},
       {text: '...', stars: 3.2},
       {text: '...', stars: 1},
       {text: '...', stars: 5},
       {text: '...', stars: 4.5},
   ]
}

product.reviews.average('stars') // 3.72

Checking an object or array for emptiness

With this check, your code will look more elegant.

let user = {}
user.isNotEmpty() // false

Checking strings (RegExp)

('[e-mail]').isEmail() // true

('12572').isOnlyNumbers() // true

('letter').isOnlyLetters() // true

('latin').isOnlyLatin() // true

('кириллица').isOnlyCyrillic() // true

('rah-emil.ru').isDomain() // true

('255.255.255.255:8000').isIP() // true

('[e-mail]').hasSymbols() // true