 /**
 *
 * The InterestCalculatorPk calculate estimated annual interest
 *
 */
class InterestCalculatorPk {
  init() {
    let that = this;
    let intCalc = document.querySelector('.sc-interest-calc-pk');
    let sliders = document.querySelector('.sc-pil-calculator__slider-amount');
    if (intCalc && sliders) {
      let minValue = Number(sliders.getAttribute('data-min'));
      let selectedElement = document.querySelector(
        `.sc-interest-calc-pk .sc-pil-calculator__slider-amount`
      );

      document.querySelector('.sc-pil-calculator__prompt-msg').innerHTML = intCalc.getAttribute(
        'data-error-msg'
      );
      //initialize noUiSlider
      // eslint-disable-next-line no-undef
      noUiSlider.create(selectedElement, {
        start: parseInt(sliders.getAttribute('data-default')),
        step: parseInt(sliders.getAttribute('data-step')),
        behaviour: 'snap',
        connect: 'lower',
        range: {
          min: parseInt(sliders.getAttribute('data-min')),
          max: parseInt(sliders.getAttribute('data-max'))
        }
      });

      // update noUiSlider
      selectedElement.noUiSlider.on('update', function(value) {
        that.updateSliders(parseInt(value));
      });

      let handles = document.querySelectorAll('.sc-interest-calc-pk .noUi-handle');
      handles.forEach(function(el) {
        el.setAttribute('aria-label', 'Drage here to move slider');
      });

      //Update input field
      document
        .querySelector('.sc-pil-calculator__input--amount')
        .addEventListener('input', function(event) {
          let value = that.validateInput(
            'sc-pil-calculator__input--amount',
            'sc-pil-calculator__slider-amount'
          );
          //update input field value
          event.target.value = value.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,'); //placed , after 3 digits ex. 7,500 and set in the current fields
          if (value < minValue) {
            document
              .querySelector('.sc-pil-calculator__prompt-msg')
              .classList.add('sc-pil-calculator__prompt-msg--show');
            document.querySelector('.sc-bnr-interest-calc__pkr-amount').innerHTML = 0;
            document.querySelector('.sc-bnr-interest-calc__interest-rate').innerHTML = 0;
          } else {
            document
              .querySelector('.sc-pil-calculator__prompt-msg')
              .classList.remove('sc-pil-calculator__prompt-msg--show');
          }
        });
    }

    //Radio button event
    let monthList = document.querySelectorAll(
      '.sc-input-selector__container .sc-input-selector__input'
    );
    if (monthList.length) {
      monthList.forEach(function(el) {
        el.addEventListener('change', function() {
          that.updateSliders();
        });
      });
    }
  }

  /**
   * check slider updated input field value, calculate interest amount and rate
   * @param {Number} value - slider value in Int
   * Example:
   * updateSliders(1000)
   **/
  updateSliders(value = 0) {
    let that = this;
	let amount = 0;
	let interestrate = 0;
    if (value == 0) {		 
      amount = document.querySelector('.sc-pil-calculator__input--amount').value.replace(/[^0-9]+/gi, '');
	  value = Number(amount);
    }
	let tenor = document
          .querySelector('.sc-input-selector__container .sc-input-selector__input:checked')
          .getAttribute('id');
    let intCalc = document.querySelector('.sc-interest-calc-pk');
    let sliders = document.querySelector('.sc-pil-calculator__slider-amount');
    let minValue = Number(sliders.getAttribute('data-min'));
    document.querySelector(`.sc-pil-calculator__input--amount`).value = that.decimalPlaces(value);
	let rateObj = JSON.parse(document.querySelector('#rate-table-json').textContent);
	let tenorIndex = 0;
	tenorIndex = rateObj.tenorUpto.indexOf(tenor);
  let amtObj = rateObj.amtUpto[tenorIndex];
  for (let amt in amtObj) {
	  if (value <= Number(amt)) {
		interestrate = amtObj[amt].rate;
		break;
	  }
}
	let days = 365 / Number(tenor);
	document.querySelector('.sc-bnr-interest-calc__pkr-amount').innerHTML = Math.round(
            (value * Number(interestrate)) / (100 * days)
          )
            .toString()
            .replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');
          document.querySelector('.sc-bnr-interest-calc__interest-rate').innerHTML = interestrate;
   if (value >= minValue) {
      document
        .querySelector('.sc-pil-calculator__prompt-msg')
        .classList.remove('sc-pil-calculator__prompt-msg--show');
    }
  }

  /**
   * check input value and return it after filter
   * @param {String} clsName - class name of input field ex. sc-pil-calculator__input--amount
   * @param {String} sliderClass - class name of slider field ex. sc-pil-calculator__slider-amount
   * Example:
   * validateInput('sc-pil-calculator__input--amount', 'sc-pil-calculator__slider-amount')
   **/
  validateInput(clsName, sliderClass) {
    let value = document.querySelector(`.${clsName}`).value,
      maxValue = Number(document.querySelector(`.${sliderClass}`).getAttribute('data-max'));
    value = value.replace(/[^0-9]+/gi, ''); //remove all string except 0-9
    value = Number(value);
    //Check number or not
    let checkNumber = Number(value);
    if (isNaN(checkNumber)) {
      //true if it's not a number
      if (/\D/g.test(value)) {
        value = value.replace(/\D/g, ''); //replace string with number
      }
    } else if (value > maxValue) {
      //checking text field maximum value
      value = maxValue;
    } else if (value == '') {
      //leave text field as blank and fill it with 0
      value = 0;
    }
    document.getElementsByClassName(`${sliderClass}`)[0].noUiSlider.set([value]); //Push value in NoUiSlider
    return value;
  }

  /**
   *  maximum two decimals places and add , after each three digits before .
   *
   * @param {number} amount - a number
   * @return {number} string, convert 3456.43 to 3,456.43
   *
   * @example
   *
   *   decimalPlaces(3456.43)
   */
  decimalPlaces(amount) {
    amount = Number(amount);
    amount = amount.toFixed(2); //keeping only two decimals
    let amountList = amount.toString().split('.'); //separate number based of .
    amount = amountList[0].toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,'); //Placed , after three digits
    if ('1' in amountList) {
      //checking fraction number is exist
      amount += Number(amountList[1]) > 0 ? '.' + amountList[1] : ''; //remove 0 after . and concat with profit
    }
    return amount;
  }
}

const instance = new InterestCalculatorPk();
window.addEventListener('load', function() {
  instance.init();
});

export default instance;

created 3 years ago

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Key Features

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Originally named as LiveScript.
Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.

Syntax help

STDIN Example

var readline = require('readline');
var rl = readline.createInterface({
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  terminal: false
});

rl.on('line', function(line){
    console.log("Hello, " + line);
});

variable declaration

Keyword	Description	Scope
var	Var is used to declare variables(old way of declaring variables)	Function or global scope
let	let is also used to declare variables(new way)	Global or block Scope
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Backtick Strings

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Multi line Strings

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An array is a collection of items or values.

Syntax:

let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);

Example:

let mobiles = ["iPhone", "Samsung", "Pixel"];

// accessing an array
console.log(mobiles[0]);

// changing an array element
mobiles[3] = "Nokia";

Arrow functions

Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.

Syntax:

() => expression

Example:

const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
                                    .map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);

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Arrays

let [firstName, lastName] = ['Foo', 'Bar']

Objects

let {firstName, lastName} = {
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  lastName: 'Bar'
}

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 const {
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  } = record;

Spread(...) operator

//Object spread
const post = {
  ...options,
  type: "new"
}
//array spread
const users = [
  ...adminUsers,
  ...normalUsers
]

Functions

function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
  console.log(`Hello ${name}!`);
}
 
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar

Loops

1. If:

IF is used to execute a block of code based on a condition.

Syntax

if(condition){
    // code
}

2. If-Else:

Else part is used to execute the block of code when the condition fails.

Syntax

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    // code
} else {
    // code
}

3. Switch:

Switch is used to replace nested If-Else statements.

Syntax

switch(condition){
    case 'value1' :
        //code
        [break;]
    case 'value2' :
        //code
        [break;]
    .......
    default :
        //code
        [break;]
}

4. For

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
//code  
}

5. While

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
  // code 
}

6. Do-While

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
  // code 
} while (condition);

Classes

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  constructor() { ... } //Mandatory Class method
  method1() { ... }
  method2() { ... }
  ...
}

Example:

class Mobile {
  constructor(model) {
    this.name = model;
  }
}

mbl = new Mobile("iPhone");